Merge github.com:grpc/grpc into break-break-break-the-locks
diff --git a/BUILD b/BUILD
index 904f068..6371a02 100644
--- a/BUILD
+++ b/BUILD
@@ -154,7 +154,6 @@
     "src/core/channel/http_client_filter.h",
     "src/core/channel/http_server_filter.h",
     "src/core/channel/noop_filter.h",
-    "src/core/compression/algorithm.h",
     "src/core/compression/message_compress.h",
     "src/core/debug/trace.h",
     "src/core/iomgr/alarm.h",
@@ -347,6 +346,7 @@
     "include/grpc/grpc_security.h",
     "include/grpc/byte_buffer.h",
     "include/grpc/byte_buffer_reader.h",
+    "include/grpc/compression.h",
     "include/grpc/grpc.h",
     "include/grpc/status.h",
     "include/grpc/census.h",
@@ -375,7 +375,6 @@
     "src/core/channel/http_client_filter.h",
     "src/core/channel/http_server_filter.h",
     "src/core/channel/noop_filter.h",
-    "src/core/compression/algorithm.h",
     "src/core/compression/message_compress.h",
     "src/core/debug/trace.h",
     "src/core/iomgr/alarm.h",
@@ -545,6 +544,7 @@
   hdrs = [
     "include/grpc/byte_buffer.h",
     "include/grpc/byte_buffer_reader.h",
+    "include/grpc/compression.h",
     "include/grpc/grpc.h",
     "include/grpc/status.h",
     "include/grpc/census.h",
diff --git a/Makefile b/Makefile
index 7afd635..d28a21f 100644
--- a/Makefile
+++ b/Makefile
@@ -3044,6 +3044,7 @@
     include/grpc/grpc_security.h \
     include/grpc/byte_buffer.h \
     include/grpc/byte_buffer_reader.h \
+    include/grpc/compression.h \
     include/grpc/grpc.h \
     include/grpc/status.h \
     include/grpc/census.h \
@@ -3286,6 +3287,7 @@
 PUBLIC_HEADERS_C += \
     include/grpc/byte_buffer.h \
     include/grpc/byte_buffer_reader.h \
+    include/grpc/compression.h \
     include/grpc/grpc.h \
     include/grpc/status.h \
     include/grpc/census.h \
diff --git a/build.json b/build.json
index d6ebd5e..aeb36fd 100644
--- a/build.json
+++ b/build.json
@@ -101,6 +101,7 @@
       "public_headers": [
         "include/grpc/byte_buffer.h",
         "include/grpc/byte_buffer_reader.h",
+        "include/grpc/compression.h",
         "include/grpc/grpc.h",
         "include/grpc/status.h"
       ],
@@ -115,7 +116,6 @@
         "src/core/channel/http_client_filter.h",
         "src/core/channel/http_server_filter.h",
         "src/core/channel/noop_filter.h",
-        "src/core/compression/algorithm.h",
         "src/core/compression/message_compress.h",
         "src/core/debug/trace.h",
         "src/core/iomgr/alarm.h",
diff --git a/include/grpc++/byte_buffer.h b/include/grpc++/byte_buffer.h
index ceb6262..3e40eae 100644
--- a/include/grpc++/byte_buffer.h
+++ b/include/grpc++/byte_buffer.h
@@ -35,6 +35,7 @@
 #define GRPCXX_BYTE_BUFFER_H
 
 #include <grpc/grpc.h>
+#include <grpc/byte_buffer.h>
 #include <grpc/support/log.h>
 #include <grpc++/config.h>
 #include <grpc++/slice.h>
diff --git a/include/grpc/byte_buffer.h b/include/grpc/byte_buffer.h
index 0ff494c..6d08474 100644
--- a/include/grpc/byte_buffer.h
+++ b/include/grpc/byte_buffer.h
@@ -34,17 +34,77 @@
 #ifndef GRPC_BYTE_BUFFER_H
 #define GRPC_BYTE_BUFFER_H
 
-#include <grpc/grpc.h>
+#include <grpc/compression.h>
 #include <grpc/support/slice_buffer.h>
 
-typedef enum { GRPC_BB_SLICE_BUFFER } grpc_byte_buffer_type;
+#ifdef __cplusplus
+extern "C" {
+#endif
 
-/* byte buffers are containers for messages passed in from the public api's */
+typedef enum {
+  GRPC_BB_RAW
+  /* Future types may include GRPC_BB_PROTOBUF, etc. */
+} grpc_byte_buffer_type;
+
 struct grpc_byte_buffer {
   grpc_byte_buffer_type type;
   union {
-    gpr_slice_buffer slice_buffer;
+    struct {
+      grpc_compression_algorithm compression;
+      gpr_slice_buffer slice_buffer;
+    } raw;
   } data;
 };
+typedef struct grpc_byte_buffer grpc_byte_buffer;
+
+/** Returns a RAW byte buffer instance over the given slices (up to \a nslices).
+ *
+ * Increases the reference count for all \a slices processed. The user is
+ * responsible for invoking grpc_byte_buffer_destroy on the returned instance.*/
+grpc_byte_buffer *grpc_raw_byte_buffer_create(gpr_slice *slices,
+                                              size_t nslices);
+
+/** Returns a *compressed* RAW byte buffer instance over the given slices (up to
+ * \a nslices). The \a compression argument defines the compression algorithm
+ * used to generate the data in \a slices.
+ *
+ * Increases the reference count for all \a slices processed. The user is
+ * responsible for invoking grpc_byte_buffer_destroy on the returned instance.*/
+grpc_byte_buffer *grpc_raw_compressed_byte_buffer_create(
+    gpr_slice *slices, size_t nslices, grpc_compression_algorithm compression);
+
+/** Copies input byte buffer \a bb.
+ *
+ * Increases the reference count of all the source slices. The user is
+ * responsible for calling grpc_byte_buffer_destroy over the returned copy. */
+grpc_byte_buffer *grpc_byte_buffer_copy(grpc_byte_buffer *bb);
+
+/** Returns the size of the given byte buffer, in bytes. */
+size_t grpc_byte_buffer_length(grpc_byte_buffer *bb);
+
+/** Destroys \a byte_buffer deallocating all its memory. */
+void grpc_byte_buffer_destroy(grpc_byte_buffer *byte_buffer);
+
+
+/** Reader for byte buffers. Iterates over slices in the byte buffer */
+struct grpc_byte_buffer_reader;
+typedef struct grpc_byte_buffer_reader grpc_byte_buffer_reader;
+
+/** Initialize \a reader to read over \a buffer */
+void grpc_byte_buffer_reader_init(grpc_byte_buffer_reader *reader,
+                                  grpc_byte_buffer *buffer);
+
+/** Cleanup and destroy \a reader */
+void grpc_byte_buffer_reader_destroy(grpc_byte_buffer_reader *reader);
+
+/** Updates \a slice with the next piece of data from from \a reader and returns
+ * 1. Returns 0 at the end of the stream. Caller is responsible for calling
+ * gpr_slice_unref on the result. */
+int grpc_byte_buffer_reader_next(grpc_byte_buffer_reader *reader,
+                                 gpr_slice *slice);
+
+#ifdef __cplusplus
+}
+#endif
 
 #endif  /* GRPC_BYTE_BUFFER_H */
diff --git a/include/grpc/byte_buffer_reader.h b/include/grpc/byte_buffer_reader.h
index cb757cf..1ef817c 100644
--- a/include/grpc/byte_buffer_reader.h
+++ b/include/grpc/byte_buffer_reader.h
@@ -37,8 +37,13 @@
 #include <grpc/grpc.h>
 #include <grpc/byte_buffer.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 struct grpc_byte_buffer_reader {
-  grpc_byte_buffer *buffer;
+  grpc_byte_buffer *buffer_in;
+  grpc_byte_buffer *buffer_out;
   /* Different current objects correspond to different types of byte buffers */
   union {
     /* Index into a slice buffer's array of slices */
@@ -46,4 +51,8 @@
   } current;
 };
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif  /* GRPC_BYTE_BUFFER_READER_H */
diff --git a/include/grpc/census.h b/include/grpc/census.h
index 5f08c10..b2049b3 100644
--- a/include/grpc/census.h
+++ b/include/grpc/census.h
@@ -40,6 +40,10 @@
 
 #include <grpc/grpc.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* Identify census functionality that can be enabled via census_initialize(). */
 enum census_functions {
   CENSUS_NONE = 0,    /* Do not enable census. */
@@ -92,4 +96,8 @@
  * future census calls will result in undefined behavior. */
 void census_context_destroy(census_context *context);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* CENSUS_CENSUS_H */
diff --git a/src/core/compression/algorithm.h b/include/grpc/compression.h
similarity index 91%
rename from src/core/compression/algorithm.h
rename to include/grpc/compression.h
index 9dd9f57..630fa16 100644
--- a/src/core/compression/algorithm.h
+++ b/include/grpc/compression.h
@@ -31,8 +31,8 @@
  *
  */
 
-#ifndef GRPC_INTERNAL_CORE_COMPRESSION_ALGORITHM_H
-#define GRPC_INTERNAL_CORE_COMPRESSION_ALGORITHM_H
+#ifndef GRPC_COMPRESSION_H
+#define GRPC_COMPRESSION_H
 
 /* The various compression algorithms supported by GRPC */
 typedef enum {
@@ -46,4 +46,4 @@
 const char *grpc_compression_algorithm_name(
     grpc_compression_algorithm algorithm);
 
-#endif  /* GRPC_INTERNAL_CORE_COMPRESSION_ALGORITHM_H */
+#endif  /* GRPC_COMPRESSION_H */
diff --git a/include/grpc/grpc.h b/include/grpc/grpc.h
index 2a7ddbd..62ee2a1 100644
--- a/include/grpc/grpc.h
+++ b/include/grpc/grpc.h
@@ -37,6 +37,7 @@
 #include <grpc/status.h>
 
 #include <stddef.h>
+#include <grpc/byte_buffer.h>
 #include <grpc/support/slice.h>
 #include <grpc/support/time.h>
 
@@ -155,34 +156,6 @@
    (start_write/add_metadata). Illegal on invoke/accept. */
 #define GRPC_WRITE_NO_COMPRESS (0x00000002u)
 
-/* A buffer of bytes */
-struct grpc_byte_buffer;
-typedef struct grpc_byte_buffer grpc_byte_buffer;
-
-/* Sample helpers to obtain byte buffers (these will certainly move
-   someplace else) */
-grpc_byte_buffer *grpc_byte_buffer_create(gpr_slice *slices, size_t nslices);
-grpc_byte_buffer *grpc_byte_buffer_copy(grpc_byte_buffer *bb);
-size_t grpc_byte_buffer_length(grpc_byte_buffer *bb);
-void grpc_byte_buffer_destroy(grpc_byte_buffer *byte_buffer);
-
-/* Reader for byte buffers. Iterates over slices in the byte buffer */
-struct grpc_byte_buffer_reader;
-typedef struct grpc_byte_buffer_reader grpc_byte_buffer_reader;
-
-/** Initialize \a reader to read over \a buffer */
-void grpc_byte_buffer_reader_init(grpc_byte_buffer_reader *reader,
-                                  grpc_byte_buffer *buffer);
-
-/** Cleanup and destroy \a reader */
-void grpc_byte_buffer_reader_destroy(grpc_byte_buffer_reader *reader);
-
-/* At the end of the stream, returns 0. Otherwise, returns 1 and sets slice to
-   be the returned slice. Caller is responsible for calling gpr_slice_unref on
-   the result. */
-int grpc_byte_buffer_reader_next(grpc_byte_buffer_reader *reader,
-                                 gpr_slice *slice);
-
 /* A single metadata element */
 typedef struct grpc_metadata {
   const char *key;
diff --git a/include/grpc/grpc_security.h b/include/grpc/grpc_security.h
index d7ed2d8..e104b69 100644
--- a/include/grpc/grpc_security.h
+++ b/include/grpc/grpc_security.h
@@ -34,8 +34,8 @@
 #ifndef GRPC_GRPC_SECURITY_H
 #define GRPC_GRPC_SECURITY_H
 
-#include "grpc.h"
-#include "status.h"
+#include <grpc/grpc.h>
+#include <grpc/status.h>
 
 #ifdef __cplusplus
 extern "C" {
@@ -117,7 +117,7 @@
 grpc_credentials *grpc_jwt_credentials_create(const char *json_key,
                                               gpr_timespec token_lifetime);
 
-/* Creates an Oauth2 Refresh Token crednetials object. May return NULL if the
+/* Creates an Oauth2 Refresh Token credentials object. May return NULL if the
    input is invalid.
    WARNING: Do NOT use this credentials to connect to a non-google service as
    this could result in an oauth2 token leak.
diff --git a/include/grpc/support/tls_pthread.h b/include/grpc/support/tls_pthread.h
index 67f169d..c18f247 100644
--- a/include/grpc/support/tls_pthread.h
+++ b/include/grpc/support/tls_pthread.h
@@ -49,7 +49,13 @@
 
 #define gpr_tls_init(tls) GPR_ASSERT(0 == pthread_key_create(&(tls)->key, NULL))
 #define gpr_tls_destroy(tls) pthread_key_delete((tls)->key)
-gpr_intptr gpr_tls_set(struct gpr_pthread_thread_local *tls, gpr_intptr value);
 #define gpr_tls_get(tls) ((gpr_intptr)pthread_getspecific((tls)->key))
+#ifdef __cplusplus
+extern "C" {
+#endif
+gpr_intptr gpr_tls_set(struct gpr_pthread_thread_local *tls, gpr_intptr value);
+#ifdef __cplusplus
+}
+#endif
 
 #endif
diff --git a/src/core/compression/algorithm.c b/src/core/compression/algorithm.c
index ca07002..36ead84 100644
--- a/src/core/compression/algorithm.c
+++ b/src/core/compression/algorithm.c
@@ -31,7 +31,7 @@
  *
  */
 
-#include "src/core/compression/algorithm.h"
+#include <grpc/compression.h>
 
 const char *grpc_compression_algorithm_name(
     grpc_compression_algorithm algorithm) {
diff --git a/src/core/compression/message_compress.h b/src/core/compression/message_compress.h
index e8aef1a..aba701a 100644
--- a/src/core/compression/message_compress.h
+++ b/src/core/compression/message_compress.h
@@ -34,7 +34,7 @@
 #ifndef GRPC_INTERNAL_CORE_COMPRESSION_MESSAGE_COMPRESS_H
 #define GRPC_INTERNAL_CORE_COMPRESSION_MESSAGE_COMPRESS_H
 
-#include "src/core/compression/algorithm.h"
+#include <grpc/compression.h>
 #include <grpc/support/slice_buffer.h>
 
 /* compress 'input' to 'output' using 'algorithm'.
diff --git a/src/core/surface/byte_buffer.c b/src/core/surface/byte_buffer.c
index 12244f6..4817e00 100644
--- a/src/core/surface/byte_buffer.c
+++ b/src/core/surface/byte_buffer.c
@@ -35,25 +35,31 @@
 #include <grpc/support/alloc.h>
 #include <grpc/support/log.h>
 
-grpc_byte_buffer *grpc_byte_buffer_create(gpr_slice *slices, size_t nslices) {
+grpc_byte_buffer *grpc_raw_byte_buffer_create(gpr_slice *slices,
+                                              size_t nslices) {
+  return grpc_raw_compressed_byte_buffer_create(slices, nslices,
+                                                GRPC_COMPRESS_NONE);
+}
+
+grpc_byte_buffer *grpc_raw_compressed_byte_buffer_create(
+    gpr_slice *slices, size_t nslices, grpc_compression_algorithm compression) {
   size_t i;
   grpc_byte_buffer *bb = malloc(sizeof(grpc_byte_buffer));
-
-  bb->type = GRPC_BB_SLICE_BUFFER;
-  gpr_slice_buffer_init(&bb->data.slice_buffer);
+  bb->type = GRPC_BB_RAW;
+  bb->data.raw.compression = compression;
+  gpr_slice_buffer_init(&bb->data.raw.slice_buffer);
   for (i = 0; i < nslices; i++) {
     gpr_slice_ref(slices[i]);
-    gpr_slice_buffer_add(&bb->data.slice_buffer, slices[i]);
+    gpr_slice_buffer_add(&bb->data.raw.slice_buffer, slices[i]);
   }
-
   return bb;
 }
 
 grpc_byte_buffer *grpc_byte_buffer_copy(grpc_byte_buffer *bb) {
   switch (bb->type) {
-    case GRPC_BB_SLICE_BUFFER:
-      return grpc_byte_buffer_create(bb->data.slice_buffer.slices,
-                                     bb->data.slice_buffer.count);
+    case GRPC_BB_RAW:
+      return grpc_raw_byte_buffer_create(bb->data.raw.slice_buffer.slices,
+                                         bb->data.raw.slice_buffer.count);
   }
   gpr_log(GPR_INFO, "should never get here");
   abort();
@@ -63,8 +69,8 @@
 void grpc_byte_buffer_destroy(grpc_byte_buffer *bb) {
   if (!bb) return;
   switch (bb->type) {
-    case GRPC_BB_SLICE_BUFFER:
-      gpr_slice_buffer_destroy(&bb->data.slice_buffer);
+    case GRPC_BB_RAW:
+      gpr_slice_buffer_destroy(&bb->data.raw.slice_buffer);
       break;
   }
   free(bb);
@@ -72,8 +78,8 @@
 
 size_t grpc_byte_buffer_length(grpc_byte_buffer *bb) {
   switch (bb->type) {
-    case GRPC_BB_SLICE_BUFFER:
-      return bb->data.slice_buffer.length;
+    case GRPC_BB_RAW:
+      return bb->data.raw.slice_buffer.length;
   }
   gpr_log(GPR_ERROR, "should never reach here");
   abort();
diff --git a/src/core/surface/byte_buffer_reader.c b/src/core/surface/byte_buffer_reader.c
index 41ad700..86829a6 100644
--- a/src/core/surface/byte_buffer_reader.c
+++ b/src/core/surface/byte_buffer_reader.c
@@ -33,41 +33,73 @@
 
 #include <grpc/byte_buffer_reader.h>
 
+#include <grpc/compression.h>
 #include <grpc/grpc.h>
 #include <grpc/support/alloc.h>
 #include <grpc/support/log.h>
 #include <grpc/support/slice_buffer.h>
 #include <grpc/byte_buffer.h>
 
+#include "src/core/compression/message_compress.h"
+
+static int is_compressed(grpc_byte_buffer *buffer) {
+  switch (buffer->type) {
+    case GRPC_BB_RAW:
+      if (buffer->data.raw.compression == GRPC_COMPRESS_NONE) {
+        return 0 /* GPR_FALSE */;
+      }
+      break;
+  }
+  return 1 /* GPR_TRUE */;
+}
+
 void grpc_byte_buffer_reader_init(grpc_byte_buffer_reader *reader,
                                   grpc_byte_buffer *buffer) {
-  reader->buffer = buffer;
-  switch (buffer->type) {
-    case GRPC_BB_SLICE_BUFFER:
+  gpr_slice_buffer decompressed_slices_buffer;
+  reader->buffer_in = buffer;
+  switch (reader->buffer_in->type) {
+    case GRPC_BB_RAW:
+      gpr_slice_buffer_init(&decompressed_slices_buffer);
+      if (is_compressed(reader->buffer_in)) {
+        grpc_msg_decompress(reader->buffer_in->data.raw.compression,
+                            &reader->buffer_in->data.raw.slice_buffer,
+                            &decompressed_slices_buffer);
+        reader->buffer_out = grpc_raw_byte_buffer_create(
+            decompressed_slices_buffer.slices,
+            decompressed_slices_buffer.count);
+        gpr_slice_buffer_destroy(&decompressed_slices_buffer);
+      } else {  /* not compressed, use the input buffer as output */
+        reader->buffer_out = reader->buffer_in;
+      }
       reader->current.index = 0;
+      break;
   }
 }
 
 void grpc_byte_buffer_reader_destroy(grpc_byte_buffer_reader *reader) {
-  /* no-op: the user is responsible for memory deallocation.
-   * Other cleanup operations would go here if needed. */
+  switch (reader->buffer_in->type) {
+    case GRPC_BB_RAW:
+      /* keeping the same if-else structure as in the init function */
+      if (is_compressed(reader->buffer_in)) {
+        grpc_byte_buffer_destroy(reader->buffer_out);
+      }
+      break;
+  }
 }
 
 int grpc_byte_buffer_reader_next(grpc_byte_buffer_reader *reader,
                                  gpr_slice *slice) {
-  grpc_byte_buffer *buffer = reader->buffer;
-  gpr_slice_buffer *slice_buffer;
-  switch (buffer->type) {
-    case GRPC_BB_SLICE_BUFFER:
-      slice_buffer = &buffer->data.slice_buffer;
+  switch (reader->buffer_in->type) {
+    case GRPC_BB_RAW: {
+      gpr_slice_buffer *slice_buffer;
+      slice_buffer = &reader->buffer_out->data.raw.slice_buffer;
       if (reader->current.index < slice_buffer->count) {
         *slice = gpr_slice_ref(slice_buffer->slices[reader->current.index]);
         reader->current.index += 1;
         return 1;
-      } else {
-        return 0;
       }
       break;
+    }
   }
   return 0;
 }
diff --git a/src/core/surface/call.c b/src/core/surface/call.c
index 5e47f71..93b3a54 100644
--- a/src/core/surface/call.c
+++ b/src/core/surface/call.c
@@ -636,7 +636,7 @@
 
 static void finish_message(grpc_call *call) {
   /* TODO(ctiller): this could be a lot faster if coded directly */
-  grpc_byte_buffer *byte_buffer = grpc_byte_buffer_create(
+  grpc_byte_buffer *byte_buffer = grpc_raw_byte_buffer_create(
       call->incoming_message.slices, call->incoming_message.count);
   gpr_slice_buffer_reset_and_unref(&call->incoming_message);
 
@@ -806,9 +806,9 @@
   size_t i;
 
   switch (byte_buffer->type) {
-    case GRPC_BB_SLICE_BUFFER:
-      for (i = 0; i < byte_buffer->data.slice_buffer.count; i++) {
-        gpr_slice slice = byte_buffer->data.slice_buffer.slices[i];
+    case GRPC_BB_RAW:
+      for (i = 0; i < byte_buffer->data.raw.slice_buffer.count; i++) {
+        gpr_slice slice = byte_buffer->data.raw.slice_buffer.slices[i];
         gpr_slice_ref(slice);
         grpc_sopb_add_slice(sopb, slice);
       }
diff --git a/src/core/transport/chttp2_transport.c b/src/core/transport/chttp2_transport.c
index 6305045..bd259f7 100644
--- a/src/core/transport/chttp2_transport.c
+++ b/src/core/transport/chttp2_transport.c
@@ -230,7 +230,10 @@
   /* basic state management - what are we doing at the moment? */
   gpr_uint8 reading;
   gpr_uint8 writing;
-  gpr_uint8 calling_back;
+  /** are we calling back (via cb) with a channel-level event */
+  gpr_uint8 calling_back_channel;
+  /** are we calling back any grpc_transport_op completion events */
+  gpr_uint8 calling_back_ops;
   gpr_uint8 destroying;
   gpr_uint8 closed;
   error_state error_state;
@@ -357,7 +360,7 @@
                          gpr_uint32 value);
 
 static int prepare_callbacks(transport *t);
-static void run_callbacks(transport *t, const grpc_transport_callbacks *cb);
+static void run_callbacks(transport *t);
 static void call_cb_closed(transport *t, const grpc_transport_callbacks *cb);
 
 static int prepare_write(transport *t);
@@ -565,7 +568,7 @@
   }
 
   gpr_mu_lock(&t->mu);
-  t->calling_back = 1;
+  t->calling_back_channel = 1;
   ref_transport(t); /* matches unref at end of this function */
   gpr_mu_unlock(&t->mu);
 
@@ -574,7 +577,7 @@
   lock(t);
   t->cb = sr.callbacks;
   t->cb_user_data = sr.user_data;
-  t->calling_back = 0;
+  t->calling_back_channel = 0;
   if (t->destroying) gpr_cv_signal(&t->cv);
   unlock(t);
 
@@ -595,7 +598,7 @@
      We need to be not writing as cancellation finalization may produce some
      callbacks that NEED to be made to close out some streams when t->writing
      becomes 0. */
-  while (t->calling_back || t->writing) {
+  while (t->calling_back_channel || t->writing) {
     gpr_cv_wait(&t->cv, &t->mu, gpr_inf_future);
   }
   drop_connection(t);
@@ -830,28 +833,29 @@
   finish_reads(t);
 
   /* gather any callbacks that need to be made */
-  if (!t->calling_back) {
-    t->calling_back = perform_callbacks = prepare_callbacks(t);
-    if (cb) {
-      if (t->error_state == ERROR_STATE_SEEN && !t->writing) {
-        call_closed = 1;
-        t->calling_back = 1;
-        t->cb = NULL; /* no more callbacks */
-        t->error_state = ERROR_STATE_NOTIFIED;
-      }
-      if (t->num_pending_goaways) {
-        goaways = t->pending_goaways;
-        num_goaways = t->num_pending_goaways;
-        t->pending_goaways = NULL;
-        t->num_pending_goaways = 0;
-        t->cap_pending_goaways = 0;
-        t->calling_back = 1;
-      }
-    }
+  if (!t->calling_back_ops) {
+    t->calling_back_ops = perform_callbacks = prepare_callbacks(t);
+    if (perform_callbacks) ref_transport(t);
   }
 
-  if (perform_callbacks || call_closed || num_goaways) {
-    ref_transport(t);
+  if (!t->calling_back_channel && cb) {
+    if (t->error_state == ERROR_STATE_SEEN && !t->writing) {
+      call_closed = 1;
+      t->calling_back_channel = 1;
+      t->cb = NULL; /* no more callbacks */
+      t->error_state = ERROR_STATE_NOTIFIED;
+    }
+    if (t->num_pending_goaways) {
+      goaways = t->pending_goaways;
+      num_goaways = t->num_pending_goaways;
+      t->pending_goaways = NULL;
+      t->num_pending_goaways = 0;
+      t->cap_pending_goaways = 0;
+      t->calling_back_channel = 1;
+    }
+    if (call_closed || num_goaways) {
+      ref_transport(t);
+    }
   }
 
   /* finally unlock */
@@ -865,7 +869,11 @@
   }
 
   if (perform_callbacks) {
-    run_callbacks(t, cb);
+    run_callbacks(t);
+    lock(t);
+    t->calling_back_ops = 0;
+    unlock(t);
+    unref_transport(t);
   }
 
   if (call_closed) {
@@ -878,9 +886,9 @@
     perform_write(t, ep);
   }
 
-  if (perform_callbacks || call_closed || num_goaways) {
+  if (call_closed || num_goaways) {
     lock(t);
-    t->calling_back = 0;
+    t->calling_back_channel = 0;
     if (t->destroying) gpr_cv_signal(&t->cv);
     unlock(t);
     unref_transport(t);
@@ -2101,7 +2109,7 @@
   return t->executing_callbacks.count > 0;
 }
 
-static void run_callbacks(transport *t, const grpc_transport_callbacks *cb) {
+static void run_callbacks(transport *t) {
   size_t i;
   for (i = 0; i < t->executing_callbacks.count; i++) {
     op_closure c = t->executing_callbacks.callbacks[i];
diff --git a/src/cpp/proto/proto_utils.cc b/src/cpp/proto/proto_utils.cc
index 7a7e73b..f4cf5cf 100644
--- a/src/cpp/proto/proto_utils.cc
+++ b/src/cpp/proto/proto_utils.cc
@@ -49,8 +49,8 @@
   explicit GrpcBufferWriter(grpc_byte_buffer** bp,
                             int block_size = kMaxBufferLength)
       : block_size_(block_size), byte_count_(0), have_backup_(false) {
-    *bp = grpc_byte_buffer_create(NULL, 0);
-    slice_buffer_ = &(*bp)->data.slice_buffer;
+    *bp = grpc_raw_byte_buffer_create(NULL, 0);
+    slice_buffer_ = &(*bp)->data.raw.slice_buffer;
   }
 
   ~GrpcBufferWriter() GRPC_OVERRIDE {
diff --git a/src/cpp/util/byte_buffer.cc b/src/cpp/util/byte_buffer.cc
index 45eaa2f..a78e422 100644
--- a/src/cpp/util/byte_buffer.cc
+++ b/src/cpp/util/byte_buffer.cc
@@ -42,7 +42,7 @@
   for (size_t i = 0; i < nslices; i++) {
     c_slices[i] = slices[i].slice_;
   }
-  buffer_ = grpc_byte_buffer_create(c_slices.data(), nslices);
+  buffer_ = grpc_raw_byte_buffer_create(c_slices.data(), nslices);
 }
 
 void ByteBuffer::Clear() {
diff --git a/src/csharp/Grpc.Core.Tests/ClientServerTest.cs b/src/csharp/Grpc.Core.Tests/ClientServerTest.cs
index b69b933..82ded5c 100644
--- a/src/csharp/Grpc.Core.Tests/ClientServerTest.cs
+++ b/src/csharp/Grpc.Core.Tests/ClientServerTest.cs
@@ -86,7 +86,7 @@
             server.AddServiceDefinition(ServiceDefinition);
             int port = server.AddListeningPort(Host, Server.PickUnusedPort);
             server.Start();
-            channel = new Channel(Host + ":" + port);
+            channel = new Channel(Host, port);
         }
 
         [TearDown]
diff --git a/src/csharp/Grpc.Core.Tests/Grpc.Core.Tests.csproj b/src/csharp/Grpc.Core.Tests/Grpc.Core.Tests.csproj
index 62cb443..0296539 100644
--- a/src/csharp/Grpc.Core.Tests/Grpc.Core.Tests.csproj
+++ b/src/csharp/Grpc.Core.Tests/Grpc.Core.Tests.csproj
@@ -3,7 +3,7 @@
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
     <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
-    <ProductVersion>10.0.0</ProductVersion>
+    <ProductVersion>8.0.30703</ProductVersion>
     <SchemaVersion>2.0</SchemaVersion>
     <ProjectGuid>{86EC5CB4-4EA2-40A2-8057-86542A0353BB}</ProjectGuid>
     <OutputType>Library</OutputType>
@@ -46,6 +46,8 @@
     <Compile Include="TimespecTest.cs" />
     <Compile Include="PInvokeTest.cs" />
     <Compile Include="Internal\MetadataArraySafeHandleTest.cs" />
+    <Compile Include="Internal\CompletionQueueSafeHandleTest.cs" />
+    <Compile Include="Internal\CompletionQueueEventTest.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <ItemGroup>
diff --git a/src/csharp/Grpc.Core.Tests/Internal/CompletionQueueEventTest.cs b/src/csharp/Grpc.Core.Tests/Internal/CompletionQueueEventTest.cs
new file mode 100644
index 0000000..188c640
--- /dev/null
+++ b/src/csharp/Grpc.Core.Tests/Internal/CompletionQueueEventTest.cs
@@ -0,0 +1,52 @@
+#region Copyright notice and license
+
+// Copyright 2015, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#endregion
+
+using System;
+using System.Runtime.InteropServices;
+using System.Threading.Tasks;
+using Grpc.Core;
+using Grpc.Core.Internal;
+using Grpc.Core.Utils;
+using NUnit.Framework;
+
+namespace Grpc.Core.Internal.Tests
+{
+    public class CompletionQueueEventTest
+    {
+        [Test]
+        public void CreateAndDestroy()
+        {
+            Assert.AreEqual(CompletionQueueEvent.NativeSize, Marshal.SizeOf(typeof(CompletionQueueEvent)));
+        }
+    }
+}
diff --git a/src/csharp/Grpc.Core.Tests/Internal/CompletionQueueSafeHandleTest.cs b/src/csharp/Grpc.Core.Tests/Internal/CompletionQueueSafeHandleTest.cs
new file mode 100644
index 0000000..a2ee183
--- /dev/null
+++ b/src/csharp/Grpc.Core.Tests/Internal/CompletionQueueSafeHandleTest.cs
@@ -0,0 +1,64 @@
+#region Copyright notice and license
+
+// Copyright 2015, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#endregion
+
+using System;
+using System.Threading.Tasks;
+using Grpc.Core;
+using Grpc.Core.Internal;
+using Grpc.Core.Utils;
+using NUnit.Framework;
+
+namespace Grpc.Core.Internal.Tests
+{
+    public class CompletionQueueSafeHandleTest
+    {
+        [Test]
+        public void CreateAndDestroy()
+        {
+            var cq = CompletionQueueSafeHandle.Create();
+            cq.Dispose();
+        }
+
+        [Test]
+        public void CreateAndShutdown()
+        {
+            var cq = CompletionQueueSafeHandle.Create();
+            cq.Shutdown();
+            var ev = cq.Next();
+            cq.Dispose();
+            Assert.AreEqual(GRPCCompletionType.Shutdown, ev.type);
+            Assert.AreNotEqual(IntPtr.Zero, ev.success);
+            Assert.AreEqual(IntPtr.Zero, ev.tag);
+        }
+    }
+}
diff --git a/src/csharp/Grpc.Core.Tests/PInvokeTest.cs b/src/csharp/Grpc.Core.Tests/PInvokeTest.cs
index 26f8766..8b3c910 100644
--- a/src/csharp/Grpc.Core.Tests/PInvokeTest.cs
+++ b/src/csharp/Grpc.Core.Tests/PInvokeTest.cs
@@ -48,7 +48,7 @@
         int counter;
 
         [DllImport("grpc_csharp_ext.dll")]
-        static extern GRPCCallError grpcsharp_test_callback([MarshalAs(UnmanagedType.FunctionPtr)] CompletionCallbackDelegate callback);
+        static extern GRPCCallError grpcsharp_test_callback([MarshalAs(UnmanagedType.FunctionPtr)] OpCompletionDelegate callback);
 
         [DllImport("grpc_csharp_ext.dll")]
         static extern IntPtr grpcsharp_test_nop(IntPtr ptr);
@@ -88,7 +88,7 @@
         [Test]
         public void NativeCallbackBenchmark()
         {
-            CompletionCallbackDelegate handler = Handler;
+            OpCompletionDelegate handler = Handler;
 
             counter = 0;
             BenchmarkUtil.RunBenchmark(
@@ -114,7 +114,7 @@
                 10000, 10000,
                 () =>
                 {
-                    grpcsharp_test_callback(new CompletionCallbackDelegate(Handler));
+                    grpcsharp_test_callback(new OpCompletionDelegate(Handler));
                 });
             Assert.AreNotEqual(0, counter);
         }
@@ -134,7 +134,7 @@
                 });
         }
 
-        private void Handler(bool success, IntPtr ptr)
+        private void Handler(bool success)
         {
             counter++;
         }
diff --git a/src/csharp/Grpc.Core/Channel.cs b/src/csharp/Grpc.Core/Channel.cs
index b47d810..44b610f 100644
--- a/src/csharp/Grpc.Core/Channel.cs
+++ b/src/csharp/Grpc.Core/Channel.cs
@@ -45,9 +45,13 @@
         readonly string target;
 
         /// <summary>
-        /// Creates a channel.
+        /// Creates a channel that connects to a specific host.
+        /// Port will default to 80 for an unsecure channel and to 443 a secure channel.
         /// </summary>
-        public Channel(string target, Credentials credentials = null, ChannelArgs channelArgs = null)
+        /// <param name="host">The DNS name of IP address of the host.</param>
+        /// <param name="credentials">Optional credentials to create a secure channel.</param>
+        /// <param name="channelArgs">Optional channel arguments.</param>
+        public Channel(string host, Credentials credentials = null, ChannelArgs channelArgs = null)
         {
             using (ChannelArgsSafeHandle nativeChannelArgs = CreateNativeChannelArgs(channelArgs))
             {
@@ -55,23 +59,27 @@
                 {
                     using (CredentialsSafeHandle nativeCredentials = credentials.ToNativeCredentials())
                     {
-                        this.handle = ChannelSafeHandle.CreateSecure(nativeCredentials, target, nativeChannelArgs);
+                        this.handle = ChannelSafeHandle.CreateSecure(nativeCredentials, host, nativeChannelArgs);
                     }
                 }
                 else
                 {
-                    this.handle = ChannelSafeHandle.Create(target, nativeChannelArgs);
+                    this.handle = ChannelSafeHandle.Create(host, nativeChannelArgs);
                 }
             }
-            this.target = GetOverridenTarget(target, channelArgs);
+            this.target = GetOverridenTarget(host, channelArgs);
         }
 
-        public string Target
+        /// <summary>
+        /// Creates a channel that connects to a specific host and port.
+        /// </summary>
+        /// <param name="host">DNS name or IP address</param>
+        /// <param name="port">the port</param>
+        /// <param name="credentials">Optional credentials to create a secure channel.</param>
+        /// <param name="channelArgs">Optional channel arguments.</param>
+        public Channel(string host, int port, Credentials credentials = null, ChannelArgs channelArgs = null) :
+            this(string.Format("{0}:{1}", host, port), credentials, channelArgs)
         {
-            get
-            {
-                return this.target;
-            }
         }
 
         public void Dispose()
@@ -80,6 +88,14 @@
             GC.SuppressFinalize(this);
         }
 
+        internal string Target
+        {
+            get
+            {
+                return target;
+            }
+        }
+
         internal ChannelSafeHandle Handle
         {
             get
diff --git a/src/csharp/Grpc.Core/Grpc.Core.csproj b/src/csharp/Grpc.Core/Grpc.Core.csproj
index fe2d446..5c7b9a8 100644
--- a/src/csharp/Grpc.Core/Grpc.Core.csproj
+++ b/src/csharp/Grpc.Core/Grpc.Core.csproj
@@ -73,7 +73,6 @@
     <Compile Include="Marshaller.cs" />
     <Compile Include="ServerServiceDefinition.cs" />
     <Compile Include="Utils\AsyncStreamExtensions.cs" />
-    <Compile Include="Internal\BatchContextSafeHandleNotOwned.cs" />
     <Compile Include="Utils\BenchmarkUtil.cs" />
     <Compile Include="Utils\ExceptionHelper.cs" />
     <Compile Include="Internal\CredentialsSafeHandle.cs" />
@@ -101,6 +100,9 @@
     <Compile Include="Internal\AtomicCounter.cs" />
     <Compile Include="Internal\DebugStats.cs" />
     <Compile Include="ServerCallContext.cs" />
+    <Compile Include="Internal\CompletionQueueEvent.cs" />
+    <Compile Include="Internal\CompletionRegistry.cs" />
+    <Compile Include="Internal\BatchContextSafeHandle.cs" />
   </ItemGroup>
   <ItemGroup>
     <None Include="packages.config" />
diff --git a/src/csharp/Grpc.Core/GrpcEnvironment.cs b/src/csharp/Grpc.Core/GrpcEnvironment.cs
index 2e9e5a2..30ff289 100644
--- a/src/csharp/Grpc.Core/GrpcEnvironment.cs
+++ b/src/csharp/Grpc.Core/GrpcEnvironment.cs
@@ -54,6 +54,7 @@
         static volatile GrpcEnvironment instance;
 
         readonly GrpcThreadPool threadPool;
+        readonly CompletionRegistry completionRegistry;
         bool isClosed;
 
         /// <summary>
@@ -105,6 +106,19 @@
             }
         }
 
+        internal static CompletionRegistry CompletionRegistry
+        {
+            get
+            {
+                var inst = instance;
+                if (inst == null)
+                {
+                    throw new InvalidOperationException("GRPC environment not initialized");
+                }
+                return inst.completionRegistry;
+            }
+        }
+
         /// <summary>
         /// Creates gRPC environment.
         /// </summary>
@@ -112,6 +126,7 @@
         {
             GrpcLog.RedirectNativeLogs(Console.Error);
             grpcsharp_init();
+            completionRegistry = new CompletionRegistry();
             threadPool = new GrpcThreadPool(THREAD_POOL_SIZE);
             threadPool.Start();
             // TODO: use proper logging here
@@ -139,14 +154,24 @@
         {
             var remainingClientCalls = DebugStats.ActiveClientCalls.Count;
             if (remainingClientCalls != 0)
-            {
-                Console.WriteLine("Warning: Detected {0} client calls that weren't disposed properly.", remainingClientCalls);
+            {                
+                DebugWarning(string.Format("Detected {0} client calls that weren't disposed properly.", remainingClientCalls));
             }
             var remainingServerCalls = DebugStats.ActiveServerCalls.Count;
             if (remainingServerCalls != 0)
             {
-                Console.WriteLine("Warning: Detected {0} server calls that weren't disposed properly.", remainingServerCalls);
+                DebugWarning(string.Format("Detected {0} server calls that weren't disposed properly.", remainingServerCalls));
             }
+            var pendingBatchCompletions = DebugStats.PendingBatchCompletions.Count;
+            if (pendingBatchCompletions != 0)
+            {
+                DebugWarning(string.Format("Detected {0} pending batch completions.", pendingBatchCompletions));
+            }
+        }
+
+        private static void DebugWarning(string message)
+        {
+            throw new Exception("Shutdown check: " + message);
         }
     }
 }
diff --git a/src/csharp/Grpc.Core/Internal/AsyncCall.cs b/src/csharp/Grpc.Core/Internal/AsyncCall.cs
index 9bb918d..d350f45 100644
--- a/src/csharp/Grpc.Core/Internal/AsyncCall.cs
+++ b/src/csharp/Grpc.Core/Internal/AsyncCall.cs
@@ -47,9 +47,6 @@
     /// </summary>
     internal class AsyncCall<TRequest, TResponse> : AsyncCallBase<TRequest, TResponse>
     {
-        readonly CompletionCallbackDelegate unaryResponseHandler;
-        readonly CompletionCallbackDelegate finishedHandler;
-
         // Completion of a pending unary response if not null.
         TaskCompletionSource<TResponse> unaryResponseTcs;
 
@@ -60,8 +57,6 @@
 
         public AsyncCall(Func<TRequest, byte[]> serializer, Func<byte[], TResponse> deserializer) : base(serializer, deserializer)
         {
-            this.unaryResponseHandler = CreateBatchCompletionCallback(HandleUnaryResponse);
-            this.finishedHandler = CreateBatchCompletionCallback(HandleFinished);
         }
 
         public void Initialize(Channel channel, CompletionQueueSafeHandle cq, string methodName)
@@ -96,7 +91,21 @@
 
                 using (var metadataArray = MetadataArraySafeHandle.Create(headers))
                 {
-                    call.BlockingUnary(cq, payload, unaryResponseHandler, metadataArray);
+                    using (var ctx = BatchContextSafeHandle.Create())
+                    {
+                        call.StartUnary(payload, ctx, metadataArray);
+                        var ev = cq.Pluck(ctx.Handle);
+
+                        bool success = (ev.success != 0);
+                        try
+                        {
+                            HandleUnaryResponse(success, ctx);
+                        }
+                        catch (Exception e)
+                        {
+                            Console.WriteLine("Exception occured while invoking completion delegate: " + e);
+                        }
+                    }
                 }
 
                 try
@@ -129,7 +138,7 @@
                 unaryResponseTcs = new TaskCompletionSource<TResponse>();
                 using (var metadataArray = MetadataArraySafeHandle.Create(headers))
                 {
-                    call.StartUnary(payload, unaryResponseHandler, metadataArray);
+                    call.StartUnary(payload, HandleUnaryResponse, metadataArray);
                 }
                 return unaryResponseTcs.Task;
             }
@@ -151,7 +160,7 @@
                 unaryResponseTcs = new TaskCompletionSource<TResponse>();
                 using (var metadataArray = MetadataArraySafeHandle.Create(headers))
                 {
-                    call.StartClientStreaming(unaryResponseHandler, metadataArray);
+                    call.StartClientStreaming(HandleUnaryResponse, metadataArray);
                 }
 
                 return unaryResponseTcs.Task;
@@ -175,7 +184,7 @@
 
                 using (var metadataArray = MetadataArraySafeHandle.Create(headers))
                 {
-                    call.StartServerStreaming(payload, finishedHandler, metadataArray);
+                    call.StartServerStreaming(payload, HandleFinished, metadataArray);
                 }
             }
         }
@@ -194,7 +203,7 @@
 
                 using (var metadataArray = MetadataArraySafeHandle.Create(headers))
                 {
-                    call.StartDuplexStreaming(finishedHandler, metadataArray);
+                    call.StartDuplexStreaming(HandleFinished, metadataArray);
                 }
             }
         }
@@ -229,7 +238,7 @@
                 Preconditions.CheckNotNull(completionDelegate, "Completion delegate cannot be null");
                 CheckSendingAllowed();
 
-                call.StartSendCloseFromClient(halfclosedHandler);
+                call.StartSendCloseFromClient(HandleHalfclosed);
 
                 halfcloseRequested = true;
                 sendCompletionDelegate = completionDelegate;
@@ -274,7 +283,7 @@
         /// <summary>
         /// Handler for unary response completion.
         /// </summary>
-        private void HandleUnaryResponse(bool success, BatchContextSafeHandleNotOwned ctx)
+        private void HandleUnaryResponse(bool success, BatchContextSafeHandle ctx)
         {
             lock (myLock)
             {
@@ -307,7 +316,7 @@
         /// <summary>
         /// Handles receive status completion for calls with streaming response.
         /// </summary>
-        private void HandleFinished(bool success, BatchContextSafeHandleNotOwned ctx)
+        private void HandleFinished(bool success, BatchContextSafeHandle ctx)
         {
             var status = ctx.GetReceivedStatus();
 
diff --git a/src/csharp/Grpc.Core/Internal/AsyncCallBase.cs b/src/csharp/Grpc.Core/Internal/AsyncCallBase.cs
index b4f4edb..64713c8 100644
--- a/src/csharp/Grpc.Core/Internal/AsyncCallBase.cs
+++ b/src/csharp/Grpc.Core/Internal/AsyncCallBase.cs
@@ -51,13 +51,8 @@
         readonly Func<TWrite, byte[]> serializer;
         readonly Func<byte[], TRead> deserializer;
 
-        protected readonly CompletionCallbackDelegate sendFinishedHandler;
-        protected readonly CompletionCallbackDelegate readFinishedHandler;
-        protected readonly CompletionCallbackDelegate halfclosedHandler;
-
         protected readonly object myLock = new object();
 
-        protected GCHandle gchandle;
         protected CallSafeHandle call;
         protected bool disposed;
 
@@ -77,10 +72,6 @@
         {
             this.serializer = Preconditions.CheckNotNull(serializer);
             this.deserializer = Preconditions.CheckNotNull(deserializer);
-  
-            this.sendFinishedHandler = CreateBatchCompletionCallback(HandleSendFinished);
-            this.readFinishedHandler = CreateBatchCompletionCallback(HandleReadFinished);
-            this.halfclosedHandler = CreateBatchCompletionCallback(HandleHalfclosed);
         }
 
         /// <summary>
@@ -121,9 +112,6 @@
         {
             lock (myLock)
             {
-                // Make sure this object and the delegated held by it will not be garbage collected
-                // before we release this handle.
-                gchandle = GCHandle.Alloc(this);
                 this.call = call;
             }
         }
@@ -141,7 +129,7 @@
                 Preconditions.CheckNotNull(completionDelegate, "Completion delegate cannot be null");
                 CheckSendingAllowed();
 
-                call.StartSendMessage(payload, sendFinishedHandler);
+                call.StartSendMessage(payload, HandleSendFinished);
                 sendCompletionDelegate = completionDelegate;
             }
         }
@@ -157,7 +145,7 @@
                 Preconditions.CheckNotNull(completionDelegate, "Completion delegate cannot be null");
                 CheckReadingAllowed();
 
-                call.StartReceiveMessage(readFinishedHandler);
+                call.StartReceiveMessage(HandleReadFinished);
                 readCompletionDelegate = completionDelegate;
             }
         }
@@ -197,7 +185,6 @@
             {
                 call.Dispose();
             }
-            gchandle.Free();
             disposed = true;
         }
 
@@ -282,29 +269,9 @@
         }
 
         /// <summary>
-        /// Creates completion callback delegate that wraps the batch completion handler in a try catch block to
-        /// prevent propagating exceptions accross managed/unmanaged boundary.
-        /// </summary>
-        protected CompletionCallbackDelegate CreateBatchCompletionCallback(Action<bool, BatchContextSafeHandleNotOwned> handler)
-        {
-            return new CompletionCallbackDelegate((success, batchContextPtr) =>
-            {
-                try
-                {
-                    var ctx = new BatchContextSafeHandleNotOwned(batchContextPtr);
-                    handler(success, ctx);
-                }
-                catch (Exception e)
-                {
-                    Console.WriteLine("Caught exception in a native handler: " + e);
-                }
-            });
-        }
-
-        /// <summary>
         /// Handles send completion.
         /// </summary>
-        private void HandleSendFinished(bool success, BatchContextSafeHandleNotOwned ctx)
+        protected void HandleSendFinished(bool success, BatchContextSafeHandle ctx)
         {
             AsyncCompletionDelegate<object> origCompletionDelegate = null;
             lock (myLock)
@@ -328,7 +295,7 @@
         /// <summary>
         /// Handles halfclose completion.
         /// </summary>
-        private void HandleHalfclosed(bool success, BatchContextSafeHandleNotOwned ctx)
+        protected void HandleHalfclosed(bool success, BatchContextSafeHandle ctx)
         {
             AsyncCompletionDelegate<object> origCompletionDelegate = null;
             lock (myLock)
@@ -353,7 +320,7 @@
         /// <summary>
         /// Handles streaming read completion.
         /// </summary>
-        private void HandleReadFinished(bool success, BatchContextSafeHandleNotOwned ctx)
+        protected void HandleReadFinished(bool success, BatchContextSafeHandle ctx)
         {
             var payload = ctx.GetReceivedMessage();
 
diff --git a/src/csharp/Grpc.Core/Internal/AsyncCallServer.cs b/src/csharp/Grpc.Core/Internal/AsyncCallServer.cs
index 1f0335e..db1b869 100644
--- a/src/csharp/Grpc.Core/Internal/AsyncCallServer.cs
+++ b/src/csharp/Grpc.Core/Internal/AsyncCallServer.cs
@@ -47,12 +47,10 @@
     /// </summary>
     internal class AsyncCallServer<TRequest, TResponse> : AsyncCallBase<TResponse, TRequest>
     {
-        readonly CompletionCallbackDelegate finishedServersideHandler;
         readonly TaskCompletionSource<object> finishedServersideTcs = new TaskCompletionSource<object>();
 
         public AsyncCallServer(Func<TResponse, byte[]> serializer, Func<byte[], TRequest> deserializer) : base(serializer, deserializer)
         {
-            this.finishedServersideHandler = CreateBatchCompletionCallback(HandleFinishedServerside);
         }
 
         public void Initialize(CallSafeHandle call)
@@ -72,7 +70,7 @@
 
                 started = true;
 
-                call.StartServerSide(finishedServersideHandler);
+                call.StartServerSide(HandleFinishedServerside);
                 return finishedServersideTcs.Task;
             }
         }
@@ -107,7 +105,7 @@
                 Preconditions.CheckNotNull(completionDelegate, "Completion delegate cannot be null");
                 CheckSendingAllowed();
 
-                call.StartSendStatusFromServer(status, halfclosedHandler);
+                call.StartSendStatusFromServer(status, HandleHalfclosed);
                 halfcloseRequested = true;
                 sendCompletionDelegate = completionDelegate;
             }
@@ -121,7 +119,7 @@
         /// <summary>
         /// Handles the server side close completion.
         /// </summary>
-        private void HandleFinishedServerside(bool success, BatchContextSafeHandleNotOwned ctx)
+        private void HandleFinishedServerside(bool success, BatchContextSafeHandle ctx)
         {
             bool cancelled = ctx.GetReceivedCloseOnServerCancelled();
 
diff --git a/src/csharp/Grpc.Core/Internal/BatchContextSafeHandleNotOwned.cs b/src/csharp/Grpc.Core/Internal/BatchContextSafeHandle.cs
similarity index 76%
rename from src/csharp/Grpc.Core/Internal/BatchContextSafeHandleNotOwned.cs
rename to src/csharp/Grpc.Core/Internal/BatchContextSafeHandle.cs
index b562aba..861cbbe 100644
--- a/src/csharp/Grpc.Core/Internal/BatchContextSafeHandleNotOwned.cs
+++ b/src/csharp/Grpc.Core/Internal/BatchContextSafeHandle.cs
@@ -41,32 +41,50 @@
     /// Not owned version of 
     /// grpcsharp_batch_context
     /// </summary>
-    internal class BatchContextSafeHandleNotOwned : SafeHandleZeroIsInvalid
+    internal class BatchContextSafeHandle : SafeHandleZeroIsInvalid
     {
         [DllImport("grpc_csharp_ext.dll")]
-        static extern IntPtr grpcsharp_batch_context_recv_message_length(BatchContextSafeHandleNotOwned ctx);
+        static extern BatchContextSafeHandle grpcsharp_batch_context_create();
 
         [DllImport("grpc_csharp_ext.dll")]
-        static extern void grpcsharp_batch_context_recv_message_to_buffer(BatchContextSafeHandleNotOwned ctx, byte[] buffer, UIntPtr bufferLen);
+        static extern IntPtr grpcsharp_batch_context_recv_message_length(BatchContextSafeHandle ctx);
 
         [DllImport("grpc_csharp_ext.dll")]
-        static extern StatusCode grpcsharp_batch_context_recv_status_on_client_status(BatchContextSafeHandleNotOwned ctx);
+        static extern void grpcsharp_batch_context_recv_message_to_buffer(BatchContextSafeHandle ctx, byte[] buffer, UIntPtr bufferLen);
 
         [DllImport("grpc_csharp_ext.dll")]
-        static extern IntPtr grpcsharp_batch_context_recv_status_on_client_details(BatchContextSafeHandleNotOwned ctx);  // returns const char*
+        static extern StatusCode grpcsharp_batch_context_recv_status_on_client_status(BatchContextSafeHandle ctx);
 
         [DllImport("grpc_csharp_ext.dll")]
-        static extern CallSafeHandle grpcsharp_batch_context_server_rpc_new_call(BatchContextSafeHandleNotOwned ctx);
+        static extern IntPtr grpcsharp_batch_context_recv_status_on_client_details(BatchContextSafeHandle ctx);  // returns const char*
 
         [DllImport("grpc_csharp_ext.dll")]
-        static extern IntPtr grpcsharp_batch_context_server_rpc_new_method(BatchContextSafeHandleNotOwned ctx);  // returns const char*
+        static extern CallSafeHandle grpcsharp_batch_context_server_rpc_new_call(BatchContextSafeHandle ctx);
 
         [DllImport("grpc_csharp_ext.dll")]
-        static extern int grpcsharp_batch_context_recv_close_on_server_cancelled(BatchContextSafeHandleNotOwned ctx);
+        static extern IntPtr grpcsharp_batch_context_server_rpc_new_method(BatchContextSafeHandle ctx);  // returns const char*
 
-        public BatchContextSafeHandleNotOwned(IntPtr handle) : base(false)
+        [DllImport("grpc_csharp_ext.dll")]
+        static extern int grpcsharp_batch_context_recv_close_on_server_cancelled(BatchContextSafeHandle ctx);
+
+        [DllImport("grpc_csharp_ext.dll")]
+        static extern void grpcsharp_batch_context_destroy(IntPtr ctx);
+
+        private BatchContextSafeHandle()
         {
-            SetHandle(handle);
+        }
+
+        public static BatchContextSafeHandle Create()
+        {
+            return grpcsharp_batch_context_create();
+        }
+
+        public IntPtr Handle
+        {
+            get
+            {
+                return handle;
+            }
         }
 
         public Status GetReceivedStatus()
@@ -102,5 +120,11 @@
         {
             return grpcsharp_batch_context_recv_close_on_server_cancelled(this) != 0;
         }
+            
+        protected override bool ReleaseHandle()
+        {
+            grpcsharp_batch_context_destroy(handle);
+            return true;
+        }
     }
 }
\ No newline at end of file
diff --git a/src/csharp/Grpc.Core/Internal/CallSafeHandle.cs b/src/csharp/Grpc.Core/Internal/CallSafeHandle.cs
index 491b841..0651498 100644
--- a/src/csharp/Grpc.Core/Internal/CallSafeHandle.cs
+++ b/src/csharp/Grpc.Core/Internal/CallSafeHandle.cs
@@ -37,8 +37,6 @@
 
 namespace Grpc.Core.Internal
 {
-    internal delegate void CompletionCallbackDelegate(bool success, IntPtr batchContextPtr);
-    
     /// <summary>
     /// grpc_call from <grpc/grpc.h>
     /// </summary>
@@ -57,49 +55,40 @@
 
         [DllImport("grpc_csharp_ext.dll")]
         static extern GRPCCallError grpcsharp_call_start_unary(CallSafeHandle call,
-                                                               [MarshalAs(UnmanagedType.FunctionPtr)] CompletionCallbackDelegate callback,
-                                                               byte[] send_buffer, UIntPtr send_buffer_len, MetadataArraySafeHandle metadataArray);
-
-        [DllImport("grpc_csharp_ext.dll")]
-        static extern void grpcsharp_call_blocking_unary(CallSafeHandle call, CompletionQueueSafeHandle dedicatedCq,
-                                                         [MarshalAs(UnmanagedType.FunctionPtr)] CompletionCallbackDelegate callback,
-                                                         byte[] send_buffer, UIntPtr send_buffer_len, MetadataArraySafeHandle metadataArray);
+            BatchContextSafeHandle ctx, byte[] send_buffer, UIntPtr send_buffer_len, MetadataArraySafeHandle metadataArray);
 
         [DllImport("grpc_csharp_ext.dll")]
         static extern GRPCCallError grpcsharp_call_start_client_streaming(CallSafeHandle call,
-                                                                          [MarshalAs(UnmanagedType.FunctionPtr)] CompletionCallbackDelegate callback,
-                                                                          MetadataArraySafeHandle metadataArray);
+            BatchContextSafeHandle ctx, MetadataArraySafeHandle metadataArray);
 
         [DllImport("grpc_csharp_ext.dll")]
         static extern GRPCCallError grpcsharp_call_start_server_streaming(CallSafeHandle call,
-                                                                          [MarshalAs(UnmanagedType.FunctionPtr)] CompletionCallbackDelegate callback,
-                                                                          byte[] send_buffer, UIntPtr send_buffer_len,
-                                                                          MetadataArraySafeHandle metadataArray);
+            BatchContextSafeHandle ctx, byte[] send_buffer, UIntPtr send_buffer_len,
+            MetadataArraySafeHandle metadataArray);
 
         [DllImport("grpc_csharp_ext.dll")]
         static extern GRPCCallError grpcsharp_call_start_duplex_streaming(CallSafeHandle call,
-                                                                          [MarshalAs(UnmanagedType.FunctionPtr)] CompletionCallbackDelegate callback,
-                                                                          MetadataArraySafeHandle metadataArray);
+            BatchContextSafeHandle ctx, MetadataArraySafeHandle metadataArray);
 
         [DllImport("grpc_csharp_ext.dll")]
         static extern GRPCCallError grpcsharp_call_send_message(CallSafeHandle call,
-                                                                [MarshalAs(UnmanagedType.FunctionPtr)] CompletionCallbackDelegate callback,
-                                                                byte[] send_buffer, UIntPtr send_buffer_len);
+            BatchContextSafeHandle ctx, byte[] send_buffer, UIntPtr send_buffer_len);
 
         [DllImport("grpc_csharp_ext.dll")]
         static extern GRPCCallError grpcsharp_call_send_close_from_client(CallSafeHandle call,
-                                                                          [MarshalAs(UnmanagedType.FunctionPtr)] CompletionCallbackDelegate callback);
+            BatchContextSafeHandle ctx);
 
         [DllImport("grpc_csharp_ext.dll")]
-        static extern GRPCCallError grpcsharp_call_send_status_from_server(CallSafeHandle call, [MarshalAs(UnmanagedType.FunctionPtr)] CompletionCallbackDelegate callback, StatusCode statusCode, string statusMessage);
+        static extern GRPCCallError grpcsharp_call_send_status_from_server(CallSafeHandle call, 
+            BatchContextSafeHandle ctx, StatusCode statusCode, string statusMessage);
 
         [DllImport("grpc_csharp_ext.dll")]
         static extern GRPCCallError grpcsharp_call_recv_message(CallSafeHandle call,
-                                                                [MarshalAs(UnmanagedType.FunctionPtr)] CompletionCallbackDelegate callback);
+            BatchContextSafeHandle ctx);
 
         [DllImport("grpc_csharp_ext.dll")]
         static extern GRPCCallError grpcsharp_call_start_serverside(CallSafeHandle call,
-                                                                    [MarshalAs(UnmanagedType.FunctionPtr)] CompletionCallbackDelegate callback);
+            BatchContextSafeHandle ctx);
 
         [DllImport("grpc_csharp_ext.dll")]
         static extern void grpcsharp_call_destroy(IntPtr call);
@@ -113,64 +102,84 @@
             return grpcsharp_channel_create_call(channel, cq, method, host, deadline);
         }
 
-        public void StartUnary(byte[] payload, CompletionCallbackDelegate callback, MetadataArraySafeHandle metadataArray)
+        public void StartUnary(byte[] payload, BatchCompletionDelegate callback, MetadataArraySafeHandle metadataArray)
         {
-            AssertCallOk(grpcsharp_call_start_unary(this, callback, payload, new UIntPtr((ulong)payload.Length), metadataArray));
+            var ctx = BatchContextSafeHandle.Create();
+            GrpcEnvironment.CompletionRegistry.RegisterBatchCompletion(ctx, callback);
+            grpcsharp_call_start_unary(this, ctx, payload, new UIntPtr((ulong)payload.Length), metadataArray)
+                .CheckOk();
         }
 
-        public void BlockingUnary(CompletionQueueSafeHandle dedicatedCq, byte[] payload, CompletionCallbackDelegate callback, MetadataArraySafeHandle metadataArray)
+        public void StartUnary(byte[] payload, BatchContextSafeHandle ctx, MetadataArraySafeHandle metadataArray)
         {
-            grpcsharp_call_blocking_unary(this, dedicatedCq, callback, payload, new UIntPtr((ulong)payload.Length), metadataArray);
+            grpcsharp_call_start_unary(this, ctx, payload, new UIntPtr((ulong)payload.Length), metadataArray)
+                .CheckOk();
         }
 
-        public void StartClientStreaming(CompletionCallbackDelegate callback, MetadataArraySafeHandle metadataArray)
+        public void StartClientStreaming(BatchCompletionDelegate callback, MetadataArraySafeHandle metadataArray)
         {
-            AssertCallOk(grpcsharp_call_start_client_streaming(this, callback, metadataArray));
+            var ctx = BatchContextSafeHandle.Create();
+            GrpcEnvironment.CompletionRegistry.RegisterBatchCompletion(ctx, callback);
+            grpcsharp_call_start_client_streaming(this, ctx, metadataArray).CheckOk();
         }
 
-        public void StartServerStreaming(byte[] payload, CompletionCallbackDelegate callback, MetadataArraySafeHandle metadataArray)
+        public void StartServerStreaming(byte[] payload, BatchCompletionDelegate callback, MetadataArraySafeHandle metadataArray)
         {
-            AssertCallOk(grpcsharp_call_start_server_streaming(this, callback, payload, new UIntPtr((ulong)payload.Length), metadataArray));
+            var ctx = BatchContextSafeHandle.Create();
+            GrpcEnvironment.CompletionRegistry.RegisterBatchCompletion(ctx, callback);
+            grpcsharp_call_start_server_streaming(this, ctx, payload, new UIntPtr((ulong)payload.Length), metadataArray).CheckOk();
         }
 
-        public void StartDuplexStreaming(CompletionCallbackDelegate callback, MetadataArraySafeHandle metadataArray)
+        public void StartDuplexStreaming(BatchCompletionDelegate callback, MetadataArraySafeHandle metadataArray)
         {
-            AssertCallOk(grpcsharp_call_start_duplex_streaming(this, callback, metadataArray));
+            var ctx = BatchContextSafeHandle.Create();
+            GrpcEnvironment.CompletionRegistry.RegisterBatchCompletion(ctx, callback);
+            grpcsharp_call_start_duplex_streaming(this, ctx, metadataArray).CheckOk();
         }
 
-        public void StartSendMessage(byte[] payload, CompletionCallbackDelegate callback)
+        public void StartSendMessage(byte[] payload, BatchCompletionDelegate callback)
         {
-            AssertCallOk(grpcsharp_call_send_message(this, callback, payload, new UIntPtr((ulong)payload.Length)));
+            var ctx = BatchContextSafeHandle.Create();
+            GrpcEnvironment.CompletionRegistry.RegisterBatchCompletion(ctx, callback);
+            grpcsharp_call_send_message(this, ctx, payload, new UIntPtr((ulong)payload.Length)).CheckOk();
         }
 
-        public void StartSendCloseFromClient(CompletionCallbackDelegate callback)
+        public void StartSendCloseFromClient(BatchCompletionDelegate callback)
         {
-            AssertCallOk(grpcsharp_call_send_close_from_client(this, callback));
+            var ctx = BatchContextSafeHandle.Create();
+            GrpcEnvironment.CompletionRegistry.RegisterBatchCompletion(ctx, callback);
+            grpcsharp_call_send_close_from_client(this, ctx).CheckOk();
         }
 
-        public void StartSendStatusFromServer(Status status, CompletionCallbackDelegate callback)
+        public void StartSendStatusFromServer(Status status, BatchCompletionDelegate callback)
         {
-            AssertCallOk(grpcsharp_call_send_status_from_server(this, callback, status.StatusCode, status.Detail));
+            var ctx = BatchContextSafeHandle.Create();
+            GrpcEnvironment.CompletionRegistry.RegisterBatchCompletion(ctx, callback);
+            grpcsharp_call_send_status_from_server(this, ctx, status.StatusCode, status.Detail).CheckOk();
         }
 
-        public void StartReceiveMessage(CompletionCallbackDelegate callback)
+        public void StartReceiveMessage(BatchCompletionDelegate callback)
         {
-            AssertCallOk(grpcsharp_call_recv_message(this, callback));
+            var ctx = BatchContextSafeHandle.Create();
+            GrpcEnvironment.CompletionRegistry.RegisterBatchCompletion(ctx, callback);
+            grpcsharp_call_recv_message(this, ctx).CheckOk();
         }
 
-        public void StartServerSide(CompletionCallbackDelegate callback)
+        public void StartServerSide(BatchCompletionDelegate callback)
         {
-            AssertCallOk(grpcsharp_call_start_serverside(this, callback));
+            var ctx = BatchContextSafeHandle.Create();
+            GrpcEnvironment.CompletionRegistry.RegisterBatchCompletion(ctx, callback);
+            grpcsharp_call_start_serverside(this, ctx).CheckOk();
         }
 
         public void Cancel()
         {
-            AssertCallOk(grpcsharp_call_cancel(this));
+            grpcsharp_call_cancel(this).CheckOk();
         }
 
         public void CancelWithStatus(Status status)
         {
-            AssertCallOk(grpcsharp_call_cancel_with_status(this, status.StatusCode, status.Detail));
+            grpcsharp_call_cancel_with_status(this, status.StatusCode, status.Detail).CheckOk();
         }
 
         protected override bool ReleaseHandle()
@@ -179,14 +188,11 @@
             return true;
         }
 
-        private static void AssertCallOk(GRPCCallError callError)
-        {
-            Preconditions.CheckState(callError == GRPCCallError.GRPC_CALL_OK, "Status not GRPC_CALL_OK");
-        }
-
         private static uint GetFlags(bool buffered)
         {
             return buffered ? 0 : GRPC_WRITE_BUFFER_HINT;
         }
+
+
     }
 }
\ No newline at end of file
diff --git a/src/csharp/Grpc.Core/Internal/CompletionQueueEvent.cs b/src/csharp/Grpc.Core/Internal/CompletionQueueEvent.cs
new file mode 100644
index 0000000..3f51751
--- /dev/null
+++ b/src/csharp/Grpc.Core/Internal/CompletionQueueEvent.cs
@@ -0,0 +1,60 @@
+#region Copyright notice and license
+
+// Copyright 2015, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#endregion
+
+using System;
+using System.Runtime.InteropServices;
+
+namespace Grpc.Core.Internal
+{
+    /// <summary>
+    /// grpc_event from grpc/grpc.h
+    /// </summary>
+    [StructLayout(LayoutKind.Sequential)]
+    internal struct CompletionQueueEvent
+    {
+        [DllImport("grpc_csharp_ext.dll")]
+        static extern int grpcsharp_sizeof_grpc_event();
+
+        public GRPCCompletionType type;
+        public int success;
+        public IntPtr tag;
+
+        internal static int NativeSize
+        {
+            get
+            {
+                return grpcsharp_sizeof_grpc_event();
+            }
+        }
+    }
+}
diff --git a/src/csharp/Grpc.Core/Internal/CompletionQueueSafeHandle.cs b/src/csharp/Grpc.Core/Internal/CompletionQueueSafeHandle.cs
index 600d1fc..f64f3d4 100644
--- a/src/csharp/Grpc.Core/Internal/CompletionQueueSafeHandle.cs
+++ b/src/csharp/Grpc.Core/Internal/CompletionQueueSafeHandle.cs
@@ -46,7 +46,10 @@
         static extern void grpcsharp_completion_queue_shutdown(CompletionQueueSafeHandle cq);
 
         [DllImport("grpc_csharp_ext.dll")]
-        static extern GRPCCompletionType grpcsharp_completion_queue_next_with_callback(CompletionQueueSafeHandle cq);
+        static extern CompletionQueueEvent grpcsharp_completion_queue_next(CompletionQueueSafeHandle cq);
+
+        [DllImport("grpc_csharp_ext.dll")]
+        static extern CompletionQueueEvent grpcsharp_completion_queue_pluck(CompletionQueueSafeHandle cq, IntPtr tag);
 
         [DllImport("grpc_csharp_ext.dll")]
         static extern void grpcsharp_completion_queue_destroy(IntPtr cq);
@@ -60,9 +63,14 @@
             return grpcsharp_completion_queue_create();
         }
 
-        public GRPCCompletionType NextWithCallback()
+        public CompletionQueueEvent Next()
         {
-            return grpcsharp_completion_queue_next_with_callback(this);
+            return grpcsharp_completion_queue_next(this);
+        }
+
+        public CompletionQueueEvent Pluck(IntPtr tag)
+        {
+            return grpcsharp_completion_queue_pluck(this, tag);
         }
 
         public void Shutdown()
diff --git a/src/csharp/Grpc.Core/Internal/CompletionRegistry.cs b/src/csharp/Grpc.Core/Internal/CompletionRegistry.cs
new file mode 100644
index 0000000..118aa13
--- /dev/null
+++ b/src/csharp/Grpc.Core/Internal/CompletionRegistry.cs
@@ -0,0 +1,88 @@
+#region Copyright notice and license
+
+// Copyright 2015, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Collections.Concurrent;
+using System.Runtime.InteropServices;
+using Grpc.Core.Utils;
+
+namespace Grpc.Core.Internal
+{
+    internal delegate void OpCompletionDelegate(bool success);
+    internal delegate void BatchCompletionDelegate(bool success, BatchContextSafeHandle ctx);
+
+    internal class CompletionRegistry
+    {
+        readonly ConcurrentDictionary<IntPtr, OpCompletionDelegate> dict = new ConcurrentDictionary<IntPtr, OpCompletionDelegate>();  
+
+        public void Register(IntPtr key, OpCompletionDelegate callback)
+        {
+            DebugStats.PendingBatchCompletions.Increment();
+            Preconditions.CheckState(dict.TryAdd(key, callback));
+        }
+
+        public void RegisterBatchCompletion(BatchContextSafeHandle ctx, BatchCompletionDelegate callback)
+        {
+            OpCompletionDelegate opCallback = ((success) => HandleBatchCompletion(success, ctx, callback));
+            Register(ctx.Handle, opCallback);
+        }
+
+        public OpCompletionDelegate Extract(IntPtr key)
+        {
+            OpCompletionDelegate value;
+            Preconditions.CheckState(dict.TryRemove(key, out value));
+            DebugStats.PendingBatchCompletions.Decrement();
+            return value;
+        }
+
+        private static void HandleBatchCompletion(bool success, BatchContextSafeHandle ctx, BatchCompletionDelegate callback)
+        {
+            try
+            {
+                callback(success, ctx);
+            }
+            catch (Exception e)
+            {
+                Console.WriteLine("Exception occured while invoking completion delegate: " + e);
+            }
+            finally
+            {
+                if (ctx != null)
+                {
+                    ctx.Dispose();
+                }
+            }
+        }
+    }
+}
diff --git a/src/csharp/Grpc.Core/Internal/DebugStats.cs b/src/csharp/Grpc.Core/Internal/DebugStats.cs
index 476914f..ef9d9af 100644
--- a/src/csharp/Grpc.Core/Internal/DebugStats.cs
+++ b/src/csharp/Grpc.Core/Internal/DebugStats.cs
@@ -41,5 +41,7 @@
         public static readonly AtomicCounter ActiveClientCalls = new AtomicCounter();
 
         public static readonly AtomicCounter ActiveServerCalls = new AtomicCounter();
+
+        public static readonly AtomicCounter PendingBatchCompletions = new AtomicCounter();
     }
 }
diff --git a/src/csharp/Grpc.Core/Internal/Enums.cs b/src/csharp/Grpc.Core/Internal/Enums.cs
index 2b4f6ca..af11b5b 100644
--- a/src/csharp/Grpc.Core/Internal/Enums.cs
+++ b/src/csharp/Grpc.Core/Internal/Enums.cs
@@ -33,35 +33,47 @@
 
 using System;
 using System.Runtime.InteropServices;
+using Grpc.Core.Utils;
 
 namespace Grpc.Core.Internal
 {
     /// <summary>
-    /// from grpc/grpc.h
+    /// grpc_call_error from grpc/grpc.h
     /// </summary>
     internal enum GRPCCallError
     {
         /* everything went ok */
-        GRPC_CALL_OK = 0,
+        OK = 0,
         /* something failed, we don't know what */
-        GRPC_CALL_ERROR,
+        Error,
         /* this method is not available on the server */
-        GRPC_CALL_ERROR_NOT_ON_SERVER,
+        NotOnServer,
         /* this method is not available on the client */
-        GRPC_CALL_ERROR_NOT_ON_CLIENT,
+        NotOnClient,
         /* this method must be called before server_accept */
-        GRPC_CALL_ERROR_ALREADY_ACCEPTED,
+        AlreadyAccepted,
         /* this method must be called before invoke */
-        GRPC_CALL_ERROR_ALREADY_INVOKED,
+        AlreadyInvoked,
         /* this method must be called after invoke */
-        GRPC_CALL_ERROR_NOT_INVOKED,
+        NotInvoked,
         /* this call is already finished
      (writes_done or write_status has already been called) */
-        GRPC_CALL_ERROR_ALREADY_FINISHED,
+        AlreadyFinished,
         /* there is already an outstanding read/write operation on the call */
-        GRPC_CALL_ERROR_TOO_MANY_OPERATIONS,
+        TooManyOperations,
         /* the flags value was illegal for this call */
-        GRPC_CALL_ERROR_INVALID_FLAGS
+        InvalidFlags
+    }
+
+    internal static class CallErrorExtensions
+    {
+        /// <summary>
+        /// Checks the call API invocation's result is OK.
+        /// </summary>
+        public static void CheckOk(this GRPCCallError callError)
+        {
+            Preconditions.CheckState(callError == GRPCCallError.OK, "Call error: " + callError);
+        }
     }
 
     /// <summary>
@@ -70,12 +82,12 @@
     internal enum GRPCCompletionType
     {
         /* Shutting down */
-        GRPC_QUEUE_SHUTDOWN, 
+        Shutdown, 
 
         /* No event before timeout */
-        GRPC_QUEUE_TIMEOUT,  
+        Timeout,  
 
         /* operation completion */
-        GRPC_OP_COMPLETE
+        OpComplete
     }
 }
diff --git a/src/csharp/Grpc.Core/Internal/GrpcThreadPool.cs b/src/csharp/Grpc.Core/Internal/GrpcThreadPool.cs
index f422466..89b44a4 100644
--- a/src/csharp/Grpc.Core/Internal/GrpcThreadPool.cs
+++ b/src/csharp/Grpc.Core/Internal/GrpcThreadPool.cs
@@ -112,12 +112,26 @@
         /// </summary>
         private void RunHandlerLoop()
         {
-            GRPCCompletionType completionType;
+            CompletionQueueEvent ev;
             do
             {
-                completionType = cq.NextWithCallback();
+                ev = cq.Next();
+                if (ev.type == GRPCCompletionType.OpComplete)
+                {
+                    bool success = (ev.success != 0);
+                    IntPtr tag = ev.tag;
+                    try
+                    {
+                        var callback = GrpcEnvironment.CompletionRegistry.Extract(tag);
+                        callback(success);
+                    }
+                    catch (Exception e)
+                    {
+                        Console.WriteLine("Exception occured while invoking completion delegate: " + e);
+                    }
+                }
             }
-            while (completionType != GRPCCompletionType.GRPC_QUEUE_SHUTDOWN);
+            while (ev.type != GRPCCompletionType.Shutdown);
             Console.WriteLine("Completion queue has shutdown successfully, thread " + Thread.CurrentThread.Name + " exiting.");
         }
     }
diff --git a/src/csharp/Grpc.Core/Internal/ServerSafeHandle.cs b/src/csharp/Grpc.Core/Internal/ServerSafeHandle.cs
index 7a1c016..edd9c49 100644
--- a/src/csharp/Grpc.Core/Internal/ServerSafeHandle.cs
+++ b/src/csharp/Grpc.Core/Internal/ServerSafeHandle.cs
@@ -45,9 +45,6 @@
     internal sealed class ServerSafeHandle : SafeHandleZeroIsInvalid
     {
         [DllImport("grpc_csharp_ext.dll")]
-        static extern GRPCCallError grpcsharp_server_request_call(ServerSafeHandle server, CompletionQueueSafeHandle cq, [MarshalAs(UnmanagedType.FunctionPtr)] CompletionCallbackDelegate callback);
-
-        [DllImport("grpc_csharp_ext.dll")]
         static extern ServerSafeHandle grpcsharp_server_create(CompletionQueueSafeHandle cq, IntPtr args);
 
         [DllImport("grpc_csharp_ext.dll")]
@@ -60,10 +57,13 @@
         static extern void grpcsharp_server_start(ServerSafeHandle server);
 
         [DllImport("grpc_csharp_ext.dll")]
+        static extern GRPCCallError grpcsharp_server_request_call(ServerSafeHandle server, CompletionQueueSafeHandle cq, BatchContextSafeHandle ctx);
+
+        [DllImport("grpc_csharp_ext.dll")]
         static extern void grpcsharp_server_shutdown(ServerSafeHandle server);
 
         [DllImport("grpc_csharp_ext.dll")]
-        static extern void grpcsharp_server_shutdown_and_notify_callback(ServerSafeHandle server, [MarshalAs(UnmanagedType.FunctionPtr)] CompletionCallbackDelegate callback);
+        static extern void grpcsharp_server_shutdown_and_notify_callback(ServerSafeHandle server, BatchContextSafeHandle ctx);
 
         [DllImport("grpc_csharp_ext.dll")]
         static extern void grpcsharp_server_destroy(IntPtr server);
@@ -97,14 +97,18 @@
             grpcsharp_server_shutdown(this);
         }
 
-        public void ShutdownAndNotify(CompletionCallbackDelegate callback)
+        public void ShutdownAndNotify(BatchCompletionDelegate callback)
         {
-            grpcsharp_server_shutdown_and_notify_callback(this, callback);
+            var ctx = BatchContextSafeHandle.Create();
+            GrpcEnvironment.CompletionRegistry.RegisterBatchCompletion(ctx, callback);
+            grpcsharp_server_shutdown_and_notify_callback(this, ctx);
         }
 
-        public void RequestCall(CompletionQueueSafeHandle cq, CompletionCallbackDelegate callback)
+        public void RequestCall(CompletionQueueSafeHandle cq, BatchCompletionDelegate callback)
         {
-            AssertCallOk(grpcsharp_server_request_call(this, cq, callback));
+            var ctx = BatchContextSafeHandle.Create();
+            GrpcEnvironment.CompletionRegistry.RegisterBatchCompletion(ctx, callback);
+            grpcsharp_server_request_call(this, cq, ctx).CheckOk();
         }
 
         protected override bool ReleaseHandle()
@@ -112,10 +116,5 @@
             grpcsharp_server_destroy(handle);
             return true;
         }
-
-        private static void AssertCallOk(GRPCCallError callError)
-        {
-            Preconditions.CheckState(callError == GRPCCallError.GRPC_CALL_OK, "Status not GRPC_CALL_OK");
-        }
     }
 }
diff --git a/src/csharp/Grpc.Core/Internal/Timespec.cs b/src/csharp/Grpc.Core/Internal/Timespec.cs
index 94d48c2..775af27 100644
--- a/src/csharp/Grpc.Core/Internal/Timespec.cs
+++ b/src/csharp/Grpc.Core/Internal/Timespec.cs
@@ -51,7 +51,7 @@
 
         [DllImport("grpc_csharp_ext.dll")]
         static extern int gprsharp_sizeof_timespec();
-        // TODO: revisit this.
+
         // NOTE: on linux 64bit  sizeof(gpr_timespec) = 16, on windows 32bit sizeof(gpr_timespec) = 8
         // so IntPtr seems to have the right size to work on both.
         public System.IntPtr tv_sec;
diff --git a/src/csharp/Grpc.Core/Server.cs b/src/csharp/Grpc.Core/Server.cs
index 4a7abbb..da59fc7 100644
--- a/src/csharp/Grpc.Core/Server.cs
+++ b/src/csharp/Grpc.Core/Server.cs
@@ -52,10 +52,8 @@
         /// </summary>
         public const int PickUnusedPort = 0;
 
-        // TODO(jtattermusch) : make sure the delegate doesn't get garbage collected while
-        // native callbacks are in the completion queue.
-        readonly CompletionCallbackDelegate serverShutdownHandler;
-        readonly CompletionCallbackDelegate newServerRpcHandler;
+        //readonly OpCompletionDelegate serverShutdownHandler;
+        //readonly OpCompletionDelegate newServerRpcHandler;
 
         readonly ServerSafeHandle handle;
         readonly object myLock = new object();
@@ -69,8 +67,8 @@
         public Server()
         {
             this.handle = ServerSafeHandle.NewServer(GetCompletionQueue(), IntPtr.Zero);
-            this.newServerRpcHandler = HandleNewServerRpc;
-            this.serverShutdownHandler = HandleServerShutdown;
+            //this.newServerRpcHandler = HandleNewServerRpc;
+            //this.serverShutdownHandler = HandleServerShutdown;
         }
 
         /// <summary>
@@ -108,7 +106,7 @@
         /// </summary>
         /// <returns>The port on which server will be listening.</returns>
         /// <param name="host">the host</param>
-        /// <param name="port">the port. If zero, , an unused port is chosen automatically.</param>
+        /// <param name="port">the port. If zero, an unused port is chosen automatically.</param>
         public int AddListeningPort(string host, int port, ServerCredentials credentials)
         {
             Preconditions.CheckNotNull(credentials);
@@ -144,7 +142,8 @@
                 shutdownRequested = true;
             }
 
-            handle.ShutdownAndNotify(serverShutdownHandler);
+            var ctx = BatchContextSafeHandle.Create();
+            handle.ShutdownAndNotify(HandleServerShutdown);
             await shutdownTcs.Task;
             handle.Dispose();
         }
@@ -194,7 +193,7 @@
             {
                 if (!shutdownRequested)
                 {
-                    handle.RequestCall(GetCompletionQueue(), newServerRpcHandler);
+                    handle.RequestCall(GetCompletionQueue(), HandleNewServerRpc);
                 }
             }
         }
@@ -222,44 +221,28 @@
         /// <summary>
         /// Handles the native callback.
         /// </summary>
-        private void HandleNewServerRpc(bool success, IntPtr batchContextPtr)
+        private void HandleNewServerRpc(bool success, BatchContextSafeHandle ctx)
         {
-            try
+            // TODO: handle error
+
+            CallSafeHandle call = ctx.GetServerRpcNewCall();
+            string method = ctx.GetServerRpcNewMethod();
+
+            // after server shutdown, the callback returns with null call
+            if (!call.IsInvalid)
             {
-                var ctx = new BatchContextSafeHandleNotOwned(batchContextPtr);
-
-                // TODO: handle error
-
-                CallSafeHandle call = ctx.GetServerRpcNewCall();
-                string method = ctx.GetServerRpcNewMethod();
-
-                // after server shutdown, the callback returns with null call
-                if (!call.IsInvalid)
-                {
-                    Task.Run(async () => await InvokeCallHandler(call, method));
-                }
-
-                AllowOneRpc();
+                Task.Run(async () => await InvokeCallHandler(call, method));
             }
-            catch (Exception e)
-            {
-                Console.WriteLine("Caught exception in a native handler: " + e);
-            }
+
+            AllowOneRpc();
         }
 
         /// <summary>
         /// Handles native callback.
         /// </summary>
-        private void HandleServerShutdown(bool success, IntPtr batchContextPtr)
+        private void HandleServerShutdown(bool success, BatchContextSafeHandle ctx)
         {
-            try
-            {
-                shutdownTcs.SetResult(null);
-            }
-            catch (Exception e)
-            {
-                Console.WriteLine("Caught exception in a native handler: " + e);
-            }
+            shutdownTcs.SetResult(null);
         }
 
         private static CompletionQueueSafeHandle GetCompletionQueue()
diff --git a/src/csharp/Grpc.Examples.MathClient/MathClient.cs b/src/csharp/Grpc.Examples.MathClient/MathClient.cs
index 85d9cdc..360fe92 100644
--- a/src/csharp/Grpc.Examples.MathClient/MathClient.cs
+++ b/src/csharp/Grpc.Examples.MathClient/MathClient.cs
@@ -41,7 +41,7 @@
         {
             GrpcEnvironment.Initialize();
 
-            using (Channel channel = new Channel("127.0.0.1:23456"))
+            using (Channel channel = new Channel("127.0.0.1", 23456))
             {
                 Math.IMathClient stub = new Math.MathClient(channel);
                 MathExamples.DivExample(stub);
diff --git a/src/csharp/Grpc.Examples.Tests/MathClientServerTests.cs b/src/csharp/Grpc.Examples.Tests/MathClientServerTests.cs
index 5aa6f41..aadd49f 100644
--- a/src/csharp/Grpc.Examples.Tests/MathClientServerTests.cs
+++ b/src/csharp/Grpc.Examples.Tests/MathClientServerTests.cs
@@ -60,7 +60,7 @@
             server.AddServiceDefinition(Math.BindService(new MathServiceImpl()));
             int port = server.AddListeningPort(host, Server.PickUnusedPort);
             server.Start();
-            channel = new Channel(host + ":" + port);
+            channel = new Channel(host, port);
 
             // TODO(jtattermusch): get rid of the custom header here once we have dedicated tests
             // for header support.
diff --git a/src/csharp/Grpc.IntegrationTesting/InteropClient.cs b/src/csharp/Grpc.IntegrationTesting/InteropClient.cs
index dfaf18c..66171fa 100644
--- a/src/csharp/Grpc.IntegrationTesting/InteropClient.cs
+++ b/src/csharp/Grpc.IntegrationTesting/InteropClient.cs
@@ -104,8 +104,6 @@
         {
             GrpcEnvironment.Initialize();
 
-            string addr = string.Format("{0}:{1}", options.serverHost, options.serverPort);
-
             Credentials credentials = null;
             if (options.useTls)
             {
@@ -119,7 +117,7 @@
                     .AddString(ChannelArgs.SslTargetNameOverrideKey, options.serverHostOverride).Build();
             }
 
-            using (Channel channel = new Channel(addr, credentials, channelArgs))
+            using (Channel channel = new Channel(options.serverHost, options.serverPort.Value, credentials, channelArgs))
             {
                 var stubConfig = StubConfiguration.Default;
                 if (options.testCase == "service_account_creds" || options.testCase == "compute_engine_creds")
diff --git a/src/csharp/Grpc.IntegrationTesting/InteropClientServerTest.cs b/src/csharp/Grpc.IntegrationTesting/InteropClientServerTest.cs
index ddbfc61..f756dfb 100644
--- a/src/csharp/Grpc.IntegrationTesting/InteropClientServerTest.cs
+++ b/src/csharp/Grpc.IntegrationTesting/InteropClientServerTest.cs
@@ -65,7 +65,7 @@
             var channelArgs = ChannelArgs.CreateBuilder()
                 .AddString(ChannelArgs.SslTargetNameOverrideKey, TestCredentials.DefaultHostOverride).Build();
 
-            channel = new Channel(host + ":" + port, TestCredentials.CreateTestClientCredentials(true), channelArgs);
+            channel = new Channel(host, port, TestCredentials.CreateTestClientCredentials(true), channelArgs);
             client = TestService.NewStub(channel);
         }
 
diff --git a/src/csharp/ext/grpc_csharp_ext.c b/src/csharp/ext/grpc_csharp_ext.c
index d59faee..57be445 100644
--- a/src/csharp/ext/grpc_csharp_ext.c
+++ b/src/csharp/ext/grpc_csharp_ext.c
@@ -60,7 +60,7 @@
 
 grpc_byte_buffer *string_to_byte_buffer(const char *buffer, size_t len) {
   gpr_slice slice = gpr_slice_from_copied_buffer(buffer, len);
-  grpc_byte_buffer *bb = grpc_byte_buffer_create(&slice, 1);
+  grpc_byte_buffer *bb = grpc_raw_byte_buffer_create(&slice, 1);
   gpr_slice_unref(slice);
   return bb;
 }
@@ -91,13 +91,9 @@
     grpc_call_details call_details;
     grpc_metadata_array request_metadata;
   } server_rpc_new;
-
-  /* callback will be called upon completion */
-  callback_funcptr callback;
-
 } grpcsharp_batch_context;
 
-grpcsharp_batch_context *grpcsharp_batch_context_create() {
+GPR_EXPORT grpcsharp_batch_context *GPR_CALLTYPE grpcsharp_batch_context_create() {
   grpcsharp_batch_context *ctx = gpr_malloc(sizeof(grpcsharp_batch_context));
   memset(ctx, 0, sizeof(grpcsharp_batch_context));
   return ctx;
@@ -192,7 +188,7 @@
   src->metadata = NULL;
 }
 
-void grpcsharp_batch_context_destroy(grpcsharp_batch_context *ctx) {
+GPR_EXPORT void GPR_CALLTYPE grpcsharp_batch_context_destroy(grpcsharp_batch_context *ctx) {
   if (!ctx) {
     return;
   }
@@ -306,25 +302,14 @@
   grpc_completion_queue_destroy(cq);
 }
 
-GPR_EXPORT grpc_completion_type GPR_CALLTYPE
-grpcsharp_completion_queue_next_with_callback(grpc_completion_queue *cq) {
-  grpc_event ev;
-  grpcsharp_batch_context *batch_context;
-  grpc_completion_type t;
+GPR_EXPORT grpc_event GPR_CALLTYPE
+grpcsharp_completion_queue_next(grpc_completion_queue *cq) {
+  return grpc_completion_queue_next(cq, gpr_inf_future);
+}
 
-  ev = grpc_completion_queue_next(cq, gpr_inf_future);
-  t = ev.type;
-  if (t == GRPC_OP_COMPLETE && ev.tag) {
-    /* NEW API handler */
-    batch_context = (grpcsharp_batch_context *)ev.tag;
-    batch_context->callback((gpr_int32) ev.success, batch_context);
-    grpcsharp_batch_context_destroy(batch_context);
-  }
-
-  /* return completion type to allow some handling for events that have no
-   * tag - such as GRPC_QUEUE_SHUTDOWN
-   */
-  return t;
+GPR_EXPORT grpc_event GPR_CALLTYPE
+grpcsharp_completion_queue_pluck(grpc_completion_queue *cq, void *tag) {
+  return grpc_completion_queue_pluck(cq, tag, gpr_inf_future);
 }
 
 /* Channel */
@@ -413,14 +398,11 @@
 }
 
 GPR_EXPORT grpc_call_error GPR_CALLTYPE
-grpcsharp_call_start_unary(grpc_call *call, callback_funcptr callback,
+grpcsharp_call_start_unary(grpc_call *call, grpcsharp_batch_context *ctx,
                            const char *send_buffer, size_t send_buffer_len,
                            grpc_metadata_array *initial_metadata) {
   /* TODO: don't use magic number */
   grpc_op ops[6];
-  grpcsharp_batch_context *ctx = grpcsharp_batch_context_create();
-  ctx->callback = callback;
-
   ops[0].op = GRPC_OP_SEND_INITIAL_METADATA;
   grpcsharp_metadata_array_move(&(ctx->send_initial_metadata),
                                 initial_metadata);
@@ -454,34 +436,12 @@
   return grpc_call_start_batch(call, ops, sizeof(ops) / sizeof(ops[0]), ctx);
 }
 
-/* Synchronous unary call */
-GPR_EXPORT void GPR_CALLTYPE
-grpcsharp_call_blocking_unary(grpc_call *call,
-                              grpc_completion_queue *dedicated_cq,
-                              callback_funcptr callback,
-                              const char *send_buffer, size_t send_buffer_len,
-                              grpc_metadata_array *initial_metadata) {
-  GPR_ASSERT(grpcsharp_call_start_unary(call, callback, send_buffer,
-                                        send_buffer_len,
-                                        initial_metadata) == GRPC_CALL_OK);
-
-  /* TODO: we would like to use pluck, but we don't know the tag */
-  GPR_ASSERT(grpcsharp_completion_queue_next_with_callback(dedicated_cq) ==
-             GRPC_OP_COMPLETE);
-  grpc_completion_queue_shutdown(dedicated_cq);
-  GPR_ASSERT(grpcsharp_completion_queue_next_with_callback(dedicated_cq) ==
-             GRPC_QUEUE_SHUTDOWN);
-}
-
 GPR_EXPORT grpc_call_error GPR_CALLTYPE
 grpcsharp_call_start_client_streaming(grpc_call *call,
-                                      callback_funcptr callback,
+                                      grpcsharp_batch_context *ctx,
                                       grpc_metadata_array *initial_metadata) {
   /* TODO: don't use magic number */
   grpc_op ops[4];
-  grpcsharp_batch_context *ctx = grpcsharp_batch_context_create();
-  ctx->callback = callback;
-
   ops[0].op = GRPC_OP_SEND_INITIAL_METADATA;
   grpcsharp_metadata_array_move(&(ctx->send_initial_metadata),
                                 initial_metadata);
@@ -510,13 +470,10 @@
 }
 
 GPR_EXPORT grpc_call_error GPR_CALLTYPE grpcsharp_call_start_server_streaming(
-    grpc_call *call, callback_funcptr callback, const char *send_buffer,
+    grpc_call *call, grpcsharp_batch_context *ctx, const char *send_buffer,
     size_t send_buffer_len, grpc_metadata_array *initial_metadata) {
   /* TODO: don't use magic number */
   grpc_op ops[5];
-  grpcsharp_batch_context *ctx = grpcsharp_batch_context_create();
-  ctx->callback = callback;
-
   ops[0].op = GRPC_OP_SEND_INITIAL_METADATA;
   grpcsharp_metadata_array_move(&(ctx->send_initial_metadata),
                                 initial_metadata);
@@ -549,13 +506,10 @@
 
 GPR_EXPORT grpc_call_error GPR_CALLTYPE
 grpcsharp_call_start_duplex_streaming(grpc_call *call,
-                                      callback_funcptr callback,
+                                      grpcsharp_batch_context *ctx,
                                       grpc_metadata_array *initial_metadata) {
   /* TODO: don't use magic number */
   grpc_op ops[3];
-  grpcsharp_batch_context *ctx = grpcsharp_batch_context_create();
-  ctx->callback = callback;
-
   ops[0].op = GRPC_OP_SEND_INITIAL_METADATA;
   grpcsharp_metadata_array_move(&(ctx->send_initial_metadata),
                                 initial_metadata);
@@ -581,13 +535,10 @@
 }
 
 GPR_EXPORT grpc_call_error GPR_CALLTYPE
-grpcsharp_call_send_message(grpc_call *call, callback_funcptr callback,
+grpcsharp_call_send_message(grpc_call *call, grpcsharp_batch_context *ctx,
                             const char *send_buffer, size_t send_buffer_len) {
   /* TODO: don't use magic number */
   grpc_op ops[1];
-  grpcsharp_batch_context *ctx = grpcsharp_batch_context_create();
-  ctx->callback = callback;
-
   ops[0].op = GRPC_OP_SEND_MESSAGE;
   ctx->send_message = string_to_byte_buffer(send_buffer, send_buffer_len);
   ops[0].data.send_message = ctx->send_message;
@@ -597,12 +548,9 @@
 
 GPR_EXPORT grpc_call_error GPR_CALLTYPE
 grpcsharp_call_send_close_from_client(grpc_call *call,
-                                      callback_funcptr callback) {
+                                      grpcsharp_batch_context *ctx) {
   /* TODO: don't use magic number */
   grpc_op ops[1];
-  grpcsharp_batch_context *ctx = grpcsharp_batch_context_create();
-  ctx->callback = callback;
-
   ops[0].op = GRPC_OP_SEND_CLOSE_FROM_CLIENT;
 
   return grpc_call_start_batch(call, ops, sizeof(ops) / sizeof(ops[0]), ctx);
@@ -610,14 +558,11 @@
 
 GPR_EXPORT grpc_call_error GPR_CALLTYPE
 grpcsharp_call_send_status_from_server(grpc_call *call,
-                                       callback_funcptr callback,
+                                       grpcsharp_batch_context *ctx,
                                        grpc_status_code status_code,
                                        const char *status_details) {
   /* TODO: don't use magic number */
   grpc_op ops[1];
-  grpcsharp_batch_context *ctx = grpcsharp_batch_context_create();
-  ctx->callback = callback;
-
   ops[0].op = GRPC_OP_SEND_STATUS_FROM_SERVER;
   ops[0].data.send_status_from_server.status = status_code;
   ops[0].data.send_status_from_server.status_details =
@@ -629,25 +574,18 @@
 }
 
 GPR_EXPORT grpc_call_error GPR_CALLTYPE
-grpcsharp_call_recv_message(grpc_call *call, callback_funcptr callback) {
+grpcsharp_call_recv_message(grpc_call *call, grpcsharp_batch_context *ctx) {
   /* TODO: don't use magic number */
   grpc_op ops[1];
-  grpcsharp_batch_context *ctx = grpcsharp_batch_context_create();
-  ctx->callback = callback;
-
   ops[0].op = GRPC_OP_RECV_MESSAGE;
   ops[0].data.recv_message = &(ctx->recv_message);
   return grpc_call_start_batch(call, ops, sizeof(ops) / sizeof(ops[0]), ctx);
 }
 
 GPR_EXPORT grpc_call_error GPR_CALLTYPE
-grpcsharp_call_start_serverside(grpc_call *call, callback_funcptr callback) {
+grpcsharp_call_start_serverside(grpc_call *call, grpcsharp_batch_context *ctx) {
   /* TODO: don't use magic number */
   grpc_op ops[2];
-
-  grpcsharp_batch_context *ctx = grpcsharp_batch_context_create();
-  ctx->callback = callback;
-
   ops[0].op = GRPC_OP_SEND_INITIAL_METADATA;
   ops[0].data.send_initial_metadata.count = 0;
   ops[0].data.send_initial_metadata.metadata = NULL;
@@ -684,9 +622,7 @@
 
 GPR_EXPORT void GPR_CALLTYPE
 grpcsharp_server_shutdown_and_notify_callback(grpc_server *server,
-                                              callback_funcptr callback) {
-  grpcsharp_batch_context *ctx = grpcsharp_batch_context_create();
-  ctx->callback = callback;
+                                              grpcsharp_batch_context *ctx) {
   grpc_server_shutdown_and_notify(server, ctx);
 }
 
@@ -696,10 +632,7 @@
 
 GPR_EXPORT grpc_call_error GPR_CALLTYPE
 grpcsharp_server_request_call(grpc_server *server, grpc_completion_queue *cq,
-                              callback_funcptr callback) {
-  grpcsharp_batch_context *ctx = grpcsharp_batch_context_create();
-  ctx->callback = callback;
-
+                              grpcsharp_batch_context *ctx) {
   return grpc_server_request_call(
       server, &(ctx->server_rpc_new.call), &(ctx->server_rpc_new.call_details),
       &(ctx->server_rpc_new.request_metadata), cq, cq, ctx);
@@ -796,3 +729,8 @@
 
 /* For testing */
 GPR_EXPORT void *GPR_CALLTYPE grpcsharp_test_nop(void *ptr) { return ptr; }
+
+/* For testing */
+GPR_EXPORT gpr_int32 GPR_CALLTYPE grpcsharp_sizeof_grpc_event(void) {
+  return sizeof(grpc_event);
+}
diff --git a/src/node/ext/byte_buffer.cc b/src/node/ext/byte_buffer.cc
index 2c84099..7eff11c 100644
--- a/src/node/ext/byte_buffer.cc
+++ b/src/node/ext/byte_buffer.cc
@@ -57,7 +57,7 @@
   char *data = ::node::Buffer::Data(buffer);
   gpr_slice slice = gpr_slice_malloc(length);
   memcpy(GPR_SLICE_START_PTR(slice), data, length);
-  grpc_byte_buffer *byte_buffer(grpc_byte_buffer_create(&slice, 1));
+  grpc_byte_buffer *byte_buffer(grpc_raw_byte_buffer_create(&slice, 1));
   gpr_slice_unref(slice);
   return byte_buffer;
 }
diff --git a/src/node/package.json b/src/node/package.json
index 3ea2c06..7d4a493 100644
--- a/src/node/package.json
+++ b/src/node/package.json
@@ -1,6 +1,6 @@
 {
   "name": "grpc",
-  "version": "0.9.0",
+  "version": "0.9.1",
   "author": "Google Inc.",
   "description": "gRPC Library for Node",
   "homepage": "http://www.grpc.io/",
diff --git a/src/node/src/common.js b/src/node/src/common.js
index 7b54335..feaa859 100644
--- a/src/node/src/common.js
+++ b/src/node/src/common.js
@@ -47,7 +47,9 @@
    * @return {cls} The resulting object
    */
   return function deserialize(arg_buf) {
-    return cls.decode(arg_buf).toRaw();
+    // Convert to a native object with binary fields as Buffers (first argument)
+    // and longs as strings (second argument)
+    return cls.decode(arg_buf).toRaw(false, true);
   };
 }
 
diff --git a/src/node/test/common_test.js b/src/node/test/common_test.js
new file mode 100644
index 0000000..08ba429
--- /dev/null
+++ b/src/node/test/common_test.js
@@ -0,0 +1,90 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+'use strict';
+
+var assert = require('assert');
+
+var common = require('../src/common.js');
+
+var ProtoBuf = require('protobufjs');
+
+var messages_proto = ProtoBuf.loadProtoFile(
+    __dirname + '/test_messages.proto').build();
+
+describe('Proto message serialize and deserialize', function() {
+  var longSerialize = common.serializeCls(messages_proto.LongValues);
+  var longDeserialize = common.deserializeCls(messages_proto.LongValues);
+  var pos_value = '314159265358979';
+  var neg_value = '-27182818284590';
+  it('should preserve positive int64 values', function() {
+    var serialized = longSerialize({int_64: pos_value});
+    assert.strictEqual(longDeserialize(serialized).int_64.toString(),
+                       pos_value);
+  });
+  it('should preserve negative int64 values', function() {
+    var serialized = longSerialize({int_64: neg_value});
+    assert.strictEqual(longDeserialize(serialized).int_64.toString(),
+                       neg_value);
+  });
+  it('should preserve uint64 values', function() {
+    var serialized = longSerialize({uint_64: pos_value});
+    assert.strictEqual(longDeserialize(serialized).uint_64.toString(),
+                       pos_value);
+  });
+  it('should preserve positive sint64 values', function() {
+    var serialized = longSerialize({sint_64: pos_value});
+    assert.strictEqual(longDeserialize(serialized).sint_64.toString(),
+                       pos_value);
+  });
+  it('should preserve negative sint64 values', function() {
+    var serialized = longSerialize({sint_64: neg_value});
+    assert.strictEqual(longDeserialize(serialized).sint_64.toString(),
+                       neg_value);
+  });
+  it('should preserve fixed64 values', function() {
+    var serialized = longSerialize({fixed_64: pos_value});
+    assert.strictEqual(longDeserialize(serialized).fixed_64.toString(),
+                       pos_value);
+  });
+  it('should preserve positive sfixed64 values', function() {
+    var serialized = longSerialize({sfixed_64: pos_value});
+    assert.strictEqual(longDeserialize(serialized).sfixed_64.toString(),
+                       pos_value);
+  });
+  it('should preserve negative sfixed64 values', function() {
+    var serialized = longSerialize({sfixed_64: neg_value});
+    assert.strictEqual(longDeserialize(serialized).sfixed_64.toString(),
+                       neg_value);
+  });
+});
diff --git a/src/node/test/test_messages.proto b/src/node/test/test_messages.proto
new file mode 100644
index 0000000..685e948
--- /dev/null
+++ b/src/node/test/test_messages.proto
@@ -0,0 +1,38 @@
+// Copyright 2015, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+syntax = "proto3";
+
+message LongValues {
+  int64 int_64 = 1;
+  uint64 uint_64 = 2;
+  sint64 sint_64 = 3;
+  fixed64 fixed_64 = 4;
+  sfixed64 sfixed_64 = 5;
+}
\ No newline at end of file
diff --git a/src/objective-c/GRPCClient/private/NSData+GRPC.m b/src/objective-c/GRPCClient/private/NSData+GRPC.m
index 3a7f768..e6a6c3c 100644
--- a/src/objective-c/GRPCClient/private/NSData+GRPC.m
+++ b/src/objective-c/GRPCClient/private/NSData+GRPC.m
@@ -55,7 +55,7 @@
 static grpc_byte_buffer *CopyCharArrayToNewByteBuffer(const char *array,
                                                       size_t length) {
   gpr_slice slice = gpr_slice_from_copied_buffer(array, length);
-  grpc_byte_buffer *buffer = grpc_byte_buffer_create(&slice, 1);
+  grpc_byte_buffer *buffer = grpc_raw_byte_buffer_create(&slice, 1);
   gpr_slice_unref(slice);
   return buffer;
 }
@@ -85,7 +85,7 @@
   // The following implementation is thus not optimal, sometimes requiring two
   // copies (one by self.bytes and another by gpr_slice_from_copied_buffer).
   // If it turns out to be an issue, we can use enumerateByteRangesUsingblock:
-  // to create an array of gpr_slice objects to pass to grpc_byte_buffer_create.
+  // to create an array of gpr_slice objects to pass to grpc_raw_byte_buffer_create.
   // That would make it do exactly one copy, always.
   return CopyCharArrayToNewByteBuffer((const char *)self.bytes, (size_t)self.length);
 }
diff --git a/src/php/ext/grpc/byte_buffer.c b/src/php/ext/grpc/byte_buffer.c
index bb9d3f5..8be0a20 100644
--- a/src/php/ext/grpc/byte_buffer.c
+++ b/src/php/ext/grpc/byte_buffer.c
@@ -51,7 +51,7 @@
 
 grpc_byte_buffer *string_to_byte_buffer(char *string, size_t length) {
   gpr_slice slice = gpr_slice_from_copied_buffer(string, length);
-  grpc_byte_buffer *buffer = grpc_byte_buffer_create(&slice, 1);
+  grpc_byte_buffer *buffer = grpc_raw_byte_buffer_create(&slice, 1);
   gpr_slice_unref(slice);
   return buffer;
 }
diff --git a/src/python/src/grpc/_adapter/_c/utility.c b/src/python/src/grpc/_adapter/_c/utility.c
index ced34a6..6722b53 100644
--- a/src/python/src/grpc/_adapter/_c/utility.c
+++ b/src/python/src/grpc/_adapter/_c/utility.c
@@ -179,7 +179,7 @@
     PyString_AsStringAndSize(
         PyTuple_GET_ITEM(op, MESSAGE_INDEX), &message, &message_size);
     message_slice = gpr_slice_from_copied_buffer(message, message_size);
-    c_op.data.send_message = grpc_byte_buffer_create(&message_slice, 1);
+    c_op.data.send_message = grpc_raw_byte_buffer_create(&message_slice, 1);
     gpr_slice_unref(message_slice);
     break;
   case GRPC_OP_SEND_CLOSE_FROM_CLIENT:
diff --git a/src/ruby/ext/grpc/rb_byte_buffer.c b/src/ruby/ext/grpc/rb_byte_buffer.c
index 1cc22f4..0aa34c8 100644
--- a/src/ruby/ext/grpc/rb_byte_buffer.c
+++ b/src/ruby/ext/grpc/rb_byte_buffer.c
@@ -42,7 +42,7 @@
 
 grpc_byte_buffer* grpc_rb_s_to_byte_buffer(char *string, size_t length) {
   gpr_slice slice = gpr_slice_from_copied_buffer(string, length);
-  grpc_byte_buffer *buffer = grpc_byte_buffer_create(&slice, 1);
+  grpc_byte_buffer *buffer = grpc_raw_byte_buffer_create(&slice, 1);
   gpr_slice_unref(slice);
   return buffer;
 }
diff --git a/test/core/end2end/cq_verifier.c b/test/core/end2end/cq_verifier.c
index 8fd6867..8a30e01 100644
--- a/test/core/end2end/cq_verifier.c
+++ b/test/core/end2end/cq_verifier.c
@@ -133,7 +133,8 @@
 
   if (!bb) return 0;
 
-  a = merge_slices(bb->data.slice_buffer.slices, bb->data.slice_buffer.count);
+  a = merge_slices(bb->data.raw.slice_buffer.slices,
+                   bb->data.raw.slice_buffer.count);
   ok = GPR_SLICE_LENGTH(a) == GPR_SLICE_LENGTH(b) &&
        0 == memcmp(GPR_SLICE_START_PTR(a), GPR_SLICE_START_PTR(b),
                    GPR_SLICE_LENGTH(a));
diff --git a/test/core/end2end/tests/cancel_after_accept.c b/test/core/end2end/tests/cancel_after_accept.c
index daf386c..74bbd01 100644
--- a/test/core/end2end/tests/cancel_after_accept.c
+++ b/test/core/end2end/tests/cancel_after_accept.c
@@ -121,9 +121,9 @@
   gpr_slice request_payload_slice = gpr_slice_from_copied_string("hello world");
   gpr_slice response_payload_slice = gpr_slice_from_copied_string("hello you");
   grpc_byte_buffer *request_payload =
-      grpc_byte_buffer_create(&request_payload_slice, 1);
+      grpc_raw_byte_buffer_create(&request_payload_slice, 1);
   grpc_byte_buffer *response_payload =
-      grpc_byte_buffer_create(&response_payload_slice, 1);
+      grpc_raw_byte_buffer_create(&response_payload_slice, 1);
   int was_cancelled = 2;
 
   c = grpc_channel_create_call(f.client, f.client_cq, "/foo",
diff --git a/test/core/end2end/tests/cancel_after_accept_and_writes_closed.c b/test/core/end2end/tests/cancel_after_accept_and_writes_closed.c
index 0bd9899..945cba7 100644
--- a/test/core/end2end/tests/cancel_after_accept_and_writes_closed.c
+++ b/test/core/end2end/tests/cancel_after_accept_and_writes_closed.c
@@ -121,9 +121,9 @@
   gpr_slice request_payload_slice = gpr_slice_from_copied_string("hello world");
   gpr_slice response_payload_slice = gpr_slice_from_copied_string("hello you");
   grpc_byte_buffer *request_payload =
-      grpc_byte_buffer_create(&request_payload_slice, 1);
+      grpc_raw_byte_buffer_create(&request_payload_slice, 1);
   grpc_byte_buffer *response_payload =
-      grpc_byte_buffer_create(&response_payload_slice, 1);
+      grpc_raw_byte_buffer_create(&response_payload_slice, 1);
   int was_cancelled = 2;
 
   c = grpc_channel_create_call(f.client, f.client_cq, "/foo",
diff --git a/test/core/end2end/tests/cancel_after_invoke.c b/test/core/end2end/tests/cancel_after_invoke.c
index c5e0ca5..c019709 100644
--- a/test/core/end2end/tests/cancel_after_invoke.c
+++ b/test/core/end2end/tests/cancel_after_invoke.c
@@ -119,7 +119,7 @@
   grpc_byte_buffer *response_payload_recv = NULL;
   gpr_slice request_payload_slice = gpr_slice_from_copied_string("hello world");
   grpc_byte_buffer *request_payload =
-      grpc_byte_buffer_create(&request_payload_slice, 1);
+      grpc_raw_byte_buffer_create(&request_payload_slice, 1);
 
   c = grpc_channel_create_call(f.client, f.client_cq, "/foo",
                                "foo.test.google.fr", deadline);
diff --git a/test/core/end2end/tests/cancel_before_invoke.c b/test/core/end2end/tests/cancel_before_invoke.c
index 0482d37..3d901f1 100644
--- a/test/core/end2end/tests/cancel_before_invoke.c
+++ b/test/core/end2end/tests/cancel_before_invoke.c
@@ -116,7 +116,7 @@
   grpc_byte_buffer *response_payload_recv = NULL;
   gpr_slice request_payload_slice = gpr_slice_from_copied_string("hello world");
   grpc_byte_buffer *request_payload =
-      grpc_byte_buffer_create(&request_payload_slice, 1);
+      grpc_raw_byte_buffer_create(&request_payload_slice, 1);
 
   c = grpc_channel_create_call(f.client, f.client_cq, "/foo",
                                "foo.test.google.fr", deadline);
diff --git a/test/core/end2end/tests/invoke_large_request.c b/test/core/end2end/tests/invoke_large_request.c
index 5552016..a1750ed 100644
--- a/test/core/end2end/tests/invoke_large_request.c
+++ b/test/core/end2end/tests/invoke_large_request.c
@@ -109,9 +109,9 @@
   grpc_call *c;
   grpc_call *s;
   grpc_byte_buffer *request_payload =
-      grpc_byte_buffer_create(&request_payload_slice, 1);
+      grpc_raw_byte_buffer_create(&request_payload_slice, 1);
   grpc_byte_buffer *response_payload =
-      grpc_byte_buffer_create(&response_payload_slice, 1);
+      grpc_raw_byte_buffer_create(&response_payload_slice, 1);
   gpr_timespec deadline = n_seconds_time(30);
   cq_verifier *v_client = cq_verifier_create(f.client_cq);
   cq_verifier *v_server = cq_verifier_create(f.server_cq);
diff --git a/test/core/end2end/tests/max_message_length.c b/test/core/end2end/tests/max_message_length.c
index 532986e..6f1a581 100644
--- a/test/core/end2end/tests/max_message_length.c
+++ b/test/core/end2end/tests/max_message_length.c
@@ -109,7 +109,7 @@
   grpc_op *op;
   gpr_slice request_payload_slice = gpr_slice_from_copied_string("hello world");
   grpc_byte_buffer *request_payload =
-      grpc_byte_buffer_create(&request_payload_slice, 1);
+      grpc_raw_byte_buffer_create(&request_payload_slice, 1);
   grpc_metadata_array initial_metadata_recv;
   grpc_metadata_array trailing_metadata_recv;
   grpc_metadata_array request_metadata_recv;
diff --git a/test/core/end2end/tests/ping_pong_streaming.c b/test/core/end2end/tests/ping_pong_streaming.c
index cfd4e45..97ac9bb 100644
--- a/test/core/end2end/tests/ping_pong_streaming.c
+++ b/test/core/end2end/tests/ping_pong_streaming.c
@@ -165,8 +165,8 @@
   GPR_ASSERT(GRPC_CALL_OK == grpc_call_start_batch(s, ops, op - ops, tag(101)));
 
   for (i = 0; i < messages; i++) {
-    request_payload = grpc_byte_buffer_create(&request_payload_slice, 1);
-    response_payload = grpc_byte_buffer_create(&response_payload_slice, 1);
+    request_payload = grpc_raw_byte_buffer_create(&request_payload_slice, 1);
+    response_payload = grpc_raw_byte_buffer_create(&response_payload_slice, 1);
 
     op = ops;
     op->op = GRPC_OP_SEND_MESSAGE;
diff --git a/test/core/end2end/tests/request_response_with_binary_metadata_and_payload.c b/test/core/end2end/tests/request_response_with_binary_metadata_and_payload.c
index 69eb68a..9788b70 100644
--- a/test/core/end2end/tests/request_response_with_binary_metadata_and_payload.c
+++ b/test/core/end2end/tests/request_response_with_binary_metadata_and_payload.c
@@ -105,9 +105,9 @@
   gpr_slice request_payload_slice = gpr_slice_from_copied_string("hello world");
   gpr_slice response_payload_slice = gpr_slice_from_copied_string("hello you");
   grpc_byte_buffer *request_payload =
-      grpc_byte_buffer_create(&request_payload_slice, 1);
+      grpc_raw_byte_buffer_create(&request_payload_slice, 1);
   grpc_byte_buffer *response_payload =
-      grpc_byte_buffer_create(&response_payload_slice, 1);
+      grpc_raw_byte_buffer_create(&response_payload_slice, 1);
   gpr_timespec deadline = five_seconds_time();
   grpc_metadata meta_c[2] = {
       {"key1-bin",
diff --git a/test/core/end2end/tests/request_response_with_metadata_and_payload.c b/test/core/end2end/tests/request_response_with_metadata_and_payload.c
index fe15fa2..fe61aef 100644
--- a/test/core/end2end/tests/request_response_with_metadata_and_payload.c
+++ b/test/core/end2end/tests/request_response_with_metadata_and_payload.c
@@ -105,9 +105,9 @@
   gpr_slice request_payload_slice = gpr_slice_from_copied_string("hello world");
   gpr_slice response_payload_slice = gpr_slice_from_copied_string("hello you");
   grpc_byte_buffer *request_payload =
-      grpc_byte_buffer_create(&request_payload_slice, 1);
+      grpc_raw_byte_buffer_create(&request_payload_slice, 1);
   grpc_byte_buffer *response_payload =
-      grpc_byte_buffer_create(&response_payload_slice, 1);
+      grpc_raw_byte_buffer_create(&response_payload_slice, 1);
   gpr_timespec deadline = five_seconds_time();
   grpc_metadata meta_c[2] = {{"key1", "val1", 4, {{NULL, NULL, NULL}}},
                              {"key2", "val2", 4, {{NULL, NULL, NULL}}}};
diff --git a/test/core/end2end/tests/request_response_with_payload.c b/test/core/end2end/tests/request_response_with_payload.c
index f0122ea..1805486 100644
--- a/test/core/end2end/tests/request_response_with_payload.c
+++ b/test/core/end2end/tests/request_response_with_payload.c
@@ -103,9 +103,9 @@
   grpc_call *c;
   grpc_call *s;
   grpc_byte_buffer *request_payload =
-      grpc_byte_buffer_create(&request_payload_slice, 1);
+      grpc_raw_byte_buffer_create(&request_payload_slice, 1);
   grpc_byte_buffer *response_payload =
-      grpc_byte_buffer_create(&response_payload_slice, 1);
+      grpc_raw_byte_buffer_create(&response_payload_slice, 1);
   gpr_timespec deadline = five_seconds_time();
   cq_verifier *v_client = cq_verifier_create(f.client_cq);
   cq_verifier *v_server = cq_verifier_create(f.server_cq);
diff --git a/test/core/end2end/tests/request_response_with_payload_and_call_creds.c b/test/core/end2end/tests/request_response_with_payload_and_call_creds.c
index 08443f1..641a409 100644
--- a/test/core/end2end/tests/request_response_with_payload_and_call_creds.c
+++ b/test/core/end2end/tests/request_response_with_payload_and_call_creds.c
@@ -156,9 +156,9 @@
   gpr_slice request_payload_slice = gpr_slice_from_copied_string("hello world");
   gpr_slice response_payload_slice = gpr_slice_from_copied_string("hello you");
   grpc_byte_buffer *request_payload =
-      grpc_byte_buffer_create(&request_payload_slice, 1);
+      grpc_raw_byte_buffer_create(&request_payload_slice, 1);
   grpc_byte_buffer *response_payload =
-      grpc_byte_buffer_create(&response_payload_slice, 1);
+      grpc_raw_byte_buffer_create(&response_payload_slice, 1);
   gpr_timespec deadline = five_seconds_time();
 
   grpc_end2end_test_fixture f = begin_test(config, test_name, NULL, NULL);
diff --git a/test/core/end2end/tests/request_response_with_trailing_metadata_and_payload.c b/test/core/end2end/tests/request_response_with_trailing_metadata_and_payload.c
index 2f221f4..8ff7f99 100644
--- a/test/core/end2end/tests/request_response_with_trailing_metadata_and_payload.c
+++ b/test/core/end2end/tests/request_response_with_trailing_metadata_and_payload.c
@@ -105,9 +105,9 @@
   gpr_slice request_payload_slice = gpr_slice_from_copied_string("hello world");
   gpr_slice response_payload_slice = gpr_slice_from_copied_string("hello you");
   grpc_byte_buffer *request_payload =
-      grpc_byte_buffer_create(&request_payload_slice, 1);
+      grpc_raw_byte_buffer_create(&request_payload_slice, 1);
   grpc_byte_buffer *response_payload =
-      grpc_byte_buffer_create(&response_payload_slice, 1);
+      grpc_raw_byte_buffer_create(&response_payload_slice, 1);
   gpr_timespec deadline = five_seconds_time();
   grpc_metadata meta_c[2] = {{"key1", "val1", 4, {{NULL, NULL, NULL}}}, {"key2", "val2", 4, {{NULL, NULL, NULL}}}};
   grpc_metadata meta_s[2] = {{"key3", "val3", 4, {{NULL, NULL, NULL}}}, {"key4", "val4", 4, {{NULL, NULL, NULL}}}};
diff --git a/test/core/end2end/tests/request_with_large_metadata.c b/test/core/end2end/tests/request_with_large_metadata.c
index b89ccb7..31406f5 100644
--- a/test/core/end2end/tests/request_with_large_metadata.c
+++ b/test/core/end2end/tests/request_with_large_metadata.c
@@ -103,7 +103,7 @@
   grpc_call *s;
   gpr_slice request_payload_slice = gpr_slice_from_copied_string("hello world");
   grpc_byte_buffer *request_payload =
-      grpc_byte_buffer_create(&request_payload_slice, 1);
+      grpc_raw_byte_buffer_create(&request_payload_slice, 1);
   gpr_timespec deadline = five_seconds_time();
   grpc_metadata meta;
   grpc_end2end_test_fixture f = begin_test(config, "test_request_with_large_metadata", NULL, NULL);
diff --git a/test/core/end2end/tests/request_with_payload.c b/test/core/end2end/tests/request_with_payload.c
index 9f6f2a9..ea4bb2c 100644
--- a/test/core/end2end/tests/request_with_payload.c
+++ b/test/core/end2end/tests/request_with_payload.c
@@ -103,7 +103,7 @@
   grpc_call *s;
   gpr_slice request_payload_slice = gpr_slice_from_copied_string("hello world");
   grpc_byte_buffer *request_payload =
-      grpc_byte_buffer_create(&request_payload_slice, 1);
+      grpc_raw_byte_buffer_create(&request_payload_slice, 1);
   gpr_timespec deadline = five_seconds_time();
   grpc_end2end_test_fixture f = begin_test(config, "test_invoke_request_with_payload", NULL, NULL);
   cq_verifier *v_client = cq_verifier_create(f.client_cq);
diff --git a/test/core/fling/client.c b/test/core/fling/client.c
index 37d787c..ee5e390 100644
--- a/test/core/fling/client.c
+++ b/test/core/fling/client.c
@@ -183,7 +183,7 @@
 
   channel = grpc_channel_create(target, NULL);
   cq = grpc_completion_queue_create();
-  the_buffer = grpc_byte_buffer_create(&slice, payload_size);
+  the_buffer = grpc_raw_byte_buffer_create(&slice, payload_size);
   histogram = gpr_histogram_create(0.01, 60e9);
 
   sc.init();
diff --git a/test/core/surface/byte_buffer_reader_test.c b/test/core/surface/byte_buffer_reader_test.c
index c2f5fc2..87a2cd7 100644
--- a/test/core/surface/byte_buffer_reader_test.c
+++ b/test/core/surface/byte_buffer_reader_test.c
@@ -42,6 +42,8 @@
 #include <grpc/support/time.h>
 #include "test/core/util/test_config.h"
 
+#include "src/core/compression/message_compress.h"
+
 #include <string.h>
 
 #define LOG_TEST(x) gpr_log(GPR_INFO, "%s", x)
@@ -55,7 +57,7 @@
 
   LOG_TEST("test_read_one_slice");
   slice = gpr_slice_from_copied_string("test");
-  buffer = grpc_byte_buffer_create(&slice, 1);
+  buffer = grpc_raw_byte_buffer_create(&slice, 1);
   gpr_slice_unref(slice);
   grpc_byte_buffer_reader_init(&reader, buffer);
   first_code = grpc_byte_buffer_reader_next(&reader, &first_slice);
@@ -77,7 +79,7 @@
   LOG_TEST("test_read_one_slice_malloc");
   slice = gpr_slice_malloc(4);
   memcpy(GPR_SLICE_START_PTR(slice), "test", 4);
-  buffer = grpc_byte_buffer_create(&slice, 1);
+  buffer = grpc_raw_byte_buffer_create(&slice, 1);
   gpr_slice_unref(slice);
   grpc_byte_buffer_reader_init(&reader, buffer);
   first_code = grpc_byte_buffer_reader_next(&reader, &first_slice);
@@ -89,9 +91,82 @@
   grpc_byte_buffer_destroy(buffer);
 }
 
+static void test_read_none_compressed_slice(void) {
+  gpr_slice slice;
+  grpc_byte_buffer *buffer;
+  grpc_byte_buffer_reader reader;
+  gpr_slice first_slice, second_slice;
+  int first_code, second_code;
+
+  LOG_TEST("test_read_none_compressed_slice");
+  slice = gpr_slice_from_copied_string("test");
+  buffer = grpc_raw_byte_buffer_create(&slice, 1);
+  gpr_slice_unref(slice);
+  grpc_byte_buffer_reader_init(&reader, buffer);
+  first_code = grpc_byte_buffer_reader_next(&reader, &first_slice);
+  GPR_ASSERT(first_code != 0);
+  GPR_ASSERT(memcmp(GPR_SLICE_START_PTR(first_slice), "test", 4) == 0);
+  gpr_slice_unref(first_slice);
+  second_code = grpc_byte_buffer_reader_next(&reader, &second_slice);
+  GPR_ASSERT(second_code == 0);
+  grpc_byte_buffer_destroy(buffer);
+}
+
+static void read_compressed_slice(grpc_compression_algorithm algorithm,
+                                  int input_size) {
+  gpr_slice input_slice;
+  gpr_slice_buffer sliceb_in;
+  gpr_slice_buffer sliceb_out;
+  grpc_byte_buffer *buffer;
+  grpc_byte_buffer_reader reader;
+  gpr_slice read_slice;
+  int read_count = 0;
+
+  gpr_slice_buffer_init(&sliceb_in);
+  gpr_slice_buffer_init(&sliceb_out);
+
+  input_slice = gpr_slice_malloc(input_size);
+  memset(GPR_SLICE_START_PTR(input_slice), 'a', input_size);
+  gpr_slice_buffer_add(&sliceb_in, input_slice);  /* takes ownership */
+  GPR_ASSERT(grpc_msg_compress(algorithm, &sliceb_in, &sliceb_out));
+
+  buffer = grpc_raw_compressed_byte_buffer_create(
+      sliceb_out.slices, sliceb_out.count, algorithm);
+  grpc_byte_buffer_reader_init(&reader, buffer);
+
+  while (grpc_byte_buffer_reader_next(&reader, &read_slice)) {
+    GPR_ASSERT(memcmp(GPR_SLICE_START_PTR(read_slice),
+                      GPR_SLICE_START_PTR(input_slice) + read_count,
+                      GPR_SLICE_LENGTH(read_slice)) == 0);
+    read_count += GPR_SLICE_LENGTH(read_slice);
+    gpr_slice_unref(read_slice);
+  }
+  GPR_ASSERT(read_count == input_size);
+  grpc_byte_buffer_reader_destroy(&reader);
+  grpc_byte_buffer_destroy(buffer);
+  gpr_slice_buffer_destroy(&sliceb_out);
+  gpr_slice_buffer_destroy(&sliceb_in);
+}
+
+static void test_read_gzip_compressed_slice(void) {
+  const int INPUT_SIZE = 2048;
+  LOG_TEST("test_read_gzip_compressed_slice");
+  read_compressed_slice(GRPC_COMPRESS_GZIP, INPUT_SIZE);
+}
+
+static void test_read_deflate_compressed_slice(void) {
+  const int INPUT_SIZE = 2048;
+  LOG_TEST("test_read_deflate_compressed_slice");
+  read_compressed_slice(GRPC_COMPRESS_DEFLATE, INPUT_SIZE);
+}
+
 int main(int argc, char **argv) {
   grpc_test_init(argc, argv);
   test_read_one_slice();
   test_read_one_slice_malloc();
+  test_read_none_compressed_slice();
+  test_read_gzip_compressed_slice();
+  test_read_deflate_compressed_slice();
+
   return 0;
 }
diff --git a/test/cpp/qps/client_async.cc b/test/cpp/qps/client_async.cc
index a238b60..921836e 100644
--- a/test/cpp/qps/client_async.cc
+++ b/test/cpp/qps/client_async.cc
@@ -236,9 +236,9 @@
     }
     if ((closed_loop_ || !rpc_deadlines_[thread_idx].empty()) &&
         grpc_time_source::now() > deadline) {
-      // we have missed some 1-second deadline, which is too much
-      gpr_log(GPR_INFO, "Missed an RPC deadline, giving up");
-      return false;
+      // we have missed some 1-second deadline, which is worth noting
+      gpr_log(GPR_INFO, "Missed an RPC deadline");
+      // Don't give up, as there might be some truly heavy tails
     }
     if (got_event) {
       ClientRpcContext* ctx = ClientRpcContext::detag(got_tag);
diff --git a/test/cpp/qps/qps_driver.cc b/test/cpp/qps/qps_driver.cc
index acc3098..d534846 100644
--- a/test/cpp/qps/qps_driver.cc
+++ b/test/cpp/qps/qps_driver.cc
@@ -132,6 +132,9 @@
       pareto->set_alpha(FLAGS_load_param_2);
       break;
     }
+    default:
+      GPR_ASSERT(false);
+      break;
   }
 
   ServerConfig server_config;
@@ -153,7 +156,7 @@
       FLAGS_warmup_seconds, FLAGS_benchmark_seconds, FLAGS_local_workers);
 
   GetReporter()->ReportQPS(*result);
-  GetReporter()->ReportQPSPerCore(*result, server_config);
+  GetReporter()->ReportQPSPerCore(*result);
   GetReporter()->ReportLatency(*result);
   GetReporter()->ReportTimes(*result);
 }
diff --git a/test/cpp/qps/qps_test.cc b/test/cpp/qps/qps_test.cc
index 63a37ae..07b4834 100644
--- a/test/cpp/qps/qps_test.cc
+++ b/test/cpp/qps/qps_test.cc
@@ -67,7 +67,7 @@
   const auto result =
       RunScenario(client_config, 1, server_config, 1, WARMUP, BENCHMARK, -2);
 
-  GetReporter()->ReportQPSPerCore(*result, server_config);
+  GetReporter()->ReportQPSPerCore(*result);
   GetReporter()->ReportLatency(*result);
 }
 
diff --git a/test/cpp/qps/qps_test_openloop.cc b/test/cpp/qps/qps_test_openloop.cc
index 0f6d8e8..52873b2 100644
--- a/test/cpp/qps/qps_test_openloop.cc
+++ b/test/cpp/qps/qps_test_openloop.cc
@@ -61,7 +61,7 @@
   client_config.set_load_type(POISSON);
   client_config.mutable_load_params()->
     mutable_poisson()->set_offered_load(10000.0);
-  
+
   ServerConfig server_config;
   server_config.set_server_type(ASYNC_SERVER);
   server_config.set_enable_ssl(false);
@@ -70,7 +70,7 @@
   const auto result =
       RunScenario(client_config, 1, server_config, 1, WARMUP, BENCHMARK, -2);
 
-  GetReporter()->ReportQPSPerCore(*result, server_config);
+  GetReporter()->ReportQPSPerCore(*result);
   GetReporter()->ReportLatency(*result);
 }
 
diff --git a/test/cpp/qps/qps_worker.cc b/test/cpp/qps/qps_worker.cc
index fb49271..40cc4cb 100644
--- a/test/cpp/qps/qps_worker.cc
+++ b/test/cpp/qps/qps_worker.cc
@@ -71,6 +71,8 @@
       return (config.rpc_type() == RpcType::UNARY)
                  ? CreateAsyncUnaryClient(config)
                  : CreateAsyncStreamingClient(config);
+    default:
+      abort();
   }
   abort();
 }
@@ -82,6 +84,8 @@
       return CreateSynchronousServer(config, server_port);
     case ServerType::ASYNC_SERVER:
       return CreateAsyncServer(config, server_port);
+    default:
+      abort();
   }
   abort();
 }
diff --git a/test/cpp/qps/qpstest.proto b/test/cpp/qps/qpstest.proto
index d977c9b..ef1f945 100644
--- a/test/cpp/qps/qpstest.proto
+++ b/test/cpp/qps/qpstest.proto
@@ -30,92 +30,92 @@
 
 // An integration test service that covers all the method signature permutations
 // of unary/streaming requests/responses.
-syntax = "proto2";
+syntax = "proto3";
 
 package grpc.testing;
 
 enum PayloadType {
   // Compressable text format.
-  COMPRESSABLE = 1;
+  COMPRESSABLE = 0;
 
   // Uncompressable binary format.
-  UNCOMPRESSABLE = 2;
+  UNCOMPRESSABLE = 1;
 
   // Randomly chosen from all other formats defined in this enum.
-  RANDOM = 3;
+  RANDOM = 2;
 }
 
 message StatsRequest {
   // run number
-  optional int32 test_num = 1;
+  int32 test_num = 1;
 }
 
 message ServerStats {
   // wall clock time
-  required double time_elapsed = 1;
+  double time_elapsed = 1;
 
   // user time used by the server process and threads
-  required double time_user = 2;
+  double time_user = 2;
 
   // server time used by the server process and all threads
-  required double time_system = 3;
+  double time_system = 3;
 }
 
 message Payload {
   // The type of data in body.
-  optional PayloadType type = 1;
+  PayloadType type = 1;
   // Primary contents of payload.
-  optional bytes body = 2;
+  bytes body = 2;
 }
 
 message HistogramData {
   repeated uint32 bucket = 1;
-  required double min_seen = 2;
-  required double max_seen = 3;
-  required double sum = 4;
-  required double sum_of_squares = 5;
-  required double count = 6;
+  double min_seen = 2;
+  double max_seen = 3;
+  double sum = 4;
+  double sum_of_squares = 5;
+  double count = 6;
 }
 
 enum ClientType {
-  SYNCHRONOUS_CLIENT = 1;
-  ASYNC_CLIENT = 2;
+  SYNCHRONOUS_CLIENT = 0;
+  ASYNC_CLIENT = 1;
 }
 
 enum ServerType {
-  SYNCHRONOUS_SERVER = 1;
-  ASYNC_SERVER = 2;
+  SYNCHRONOUS_SERVER = 0;
+  ASYNC_SERVER = 1;
 }
 
 enum RpcType {
-  UNARY = 1;
-  STREAMING = 2;
+  UNARY = 0;
+  STREAMING = 1;
 }
 
 enum LoadType {
-  CLOSED_LOOP = 1;
-  POISSON = 2;
-  UNIFORM = 3;
-  DETERMINISTIC = 4;
-  PARETO = 5;
+  CLOSED_LOOP = 0;
+  POISSON = 1;
+  UNIFORM = 2;
+  DETERMINISTIC = 3;
+  PARETO = 4;
 }
 
 message PoissonParams {
-  optional double offered_load = 1;
+  double offered_load = 1;
 }
 
 message UniformParams {
-  optional double interarrival_lo = 1;
-  optional double interarrival_hi = 2;
+  double interarrival_lo = 1;
+  double interarrival_hi = 2;
 }
 
 message DeterministicParams {
-  optional double offered_load = 1;
+  double offered_load = 1;
 }
 
 message ParetoParams {
-  optional double interarrival_base = 1;
-  optional double alpha = 2;
+  double interarrival_base = 1;
+  double alpha = 2;
 }
 
 message LoadParams {
@@ -129,17 +129,17 @@
 
 message ClientConfig {
   repeated string server_targets = 1;
-  required ClientType client_type = 2;
-  optional bool enable_ssl = 3 [default = false];
-  required int32 outstanding_rpcs_per_channel = 4;
-  required int32 client_channels = 5;
-  required int32 payload_size = 6;
+  ClientType client_type = 2;
+  bool enable_ssl = 3;
+  int32 outstanding_rpcs_per_channel = 4;
+  int32 client_channels = 5;
+  int32 payload_size = 6;
   // only for async client:
-  optional int32 async_client_threads = 7;
-  optional RpcType rpc_type = 8 [default = UNARY];
-  optional string host = 9;
-  optional LoadType load_type = 10 [default = CLOSED_LOOP];
-  optional LoadParams load_params = 11;
+  int32 async_client_threads = 7;
+  RpcType rpc_type = 8;
+  string host = 9;
+  LoadType load_type = 10;
+  LoadParams load_params = 11;
 }
 
 // Request current stats
@@ -154,21 +154,21 @@
 }
 
 message ClientStats {
-  required HistogramData latencies = 1;
-  required double time_elapsed = 3;
-  required double time_user = 4;
-  required double time_system = 5;
+  HistogramData latencies = 1;
+  double time_elapsed = 2;
+  double time_user = 3;
+  double time_system = 4;
 }
 
 message ClientStatus {
-  optional ClientStats stats = 1;
+  ClientStats stats = 1;
 }
 
 message ServerConfig {
-  required ServerType server_type = 1;
-  optional int32 threads = 2 [default = 1];
-  optional bool enable_ssl = 3 [default = false];
-  optional string host = 4;
+  ServerType server_type = 1;
+  int32 threads = 2;
+  bool enable_ssl = 3;
+  string host = 4;
 }
 
 message ServerArgs {
@@ -179,25 +179,25 @@
 }
 
 message ServerStatus {
-  optional ServerStats stats = 1;
-  required int32 port = 2;
+  ServerStats stats = 1;
+  int32 port = 2;
 }
 
 message SimpleRequest {
   // Desired payload type in the response from the server.
   // If response_type is RANDOM, server randomly chooses one from other formats.
-  optional PayloadType response_type = 1 [default = COMPRESSABLE];
+  PayloadType response_type = 1;
 
   // Desired payload size in the response from the server.
   // If response_type is COMPRESSABLE, this denotes the size before compression.
-  optional int32 response_size = 2 [default = 0];
+  int32 response_size = 2;
 
   // Optional input payload sent along with the request.
-  optional Payload payload = 3;
+  Payload payload = 3;
 }
 
 message SimpleResponse {
-  optional Payload payload = 1;
+  Payload payload = 1;
 }
 
 service TestService {
diff --git a/test/cpp/qps/server_async.cc b/test/cpp/qps/server_async.cc
index 977dfc2..4b0678b 100644
--- a/test/cpp/qps/server_async.cc
+++ b/test/cpp/qps/server_async.cc
@@ -101,10 +101,11 @@
           ServerRpcContext *ctx = detag(got_tag);
           // The tag is a pointer to an RPC context to invoke
           bool still_going = ctx->RunNextState(ok);
-          std::lock_guard<std::mutex> g(shutdown_mutex_);
+          std::unique_lock<std::mutex> g(shutdown_mutex_);
           if (!shutdown_) {
             // this RPC context is done, so refresh it
             if (!still_going) {
+              g.unlock();
               ctx->Reset();
             }
           } else {
diff --git a/tools/doxygen/Doxyfile.core b/tools/doxygen/Doxyfile.core
index c1ea727..a834728 100644
--- a/tools/doxygen/Doxyfile.core
+++ b/tools/doxygen/Doxyfile.core
@@ -760,7 +760,7 @@
 # spaces.
 # Note: If this tag is empty the current directory is searched.
 
-INPUT                  = include/grpc/grpc_security.h include/grpc/byte_buffer.h include/grpc/byte_buffer_reader.h include/grpc/grpc.h include/grpc/status.h include/grpc/census.h include/grpc/support/alloc.h include/grpc/support/atm.h include/grpc/support/atm_gcc_atomic.h include/grpc/support/atm_gcc_sync.h include/grpc/support/atm_win32.h include/grpc/support/cancellable_platform.h include/grpc/support/cmdline.h include/grpc/support/cpu.h include/grpc/support/histogram.h include/grpc/support/host_port.h include/grpc/support/log.h include/grpc/support/log_win32.h include/grpc/support/port_platform.h include/grpc/support/slice.h include/grpc/support/slice_buffer.h include/grpc/support/string_util.h include/grpc/support/subprocess.h include/grpc/support/sync.h include/grpc/support/sync_generic.h include/grpc/support/sync_posix.h include/grpc/support/sync_win32.h include/grpc/support/thd.h include/grpc/support/time.h include/grpc/support/tls.h include/grpc/support/tls_gcc.h include/grpc/support/tls_msvc.h include/grpc/support/tls_pthread.h include/grpc/support/useful.h
+INPUT                  = include/grpc/grpc_security.h include/grpc/byte_buffer.h include/grpc/byte_buffer_reader.h include/grpc/compression.h include/grpc/grpc.h include/grpc/status.h include/grpc/census.h include/grpc/support/alloc.h include/grpc/support/atm.h include/grpc/support/atm_gcc_atomic.h include/grpc/support/atm_gcc_sync.h include/grpc/support/atm_win32.h include/grpc/support/cancellable_platform.h include/grpc/support/cmdline.h include/grpc/support/cpu.h include/grpc/support/histogram.h include/grpc/support/host_port.h include/grpc/support/log.h include/grpc/support/log_win32.h include/grpc/support/port_platform.h include/grpc/support/slice.h include/grpc/support/slice_buffer.h include/grpc/support/string_util.h include/grpc/support/subprocess.h include/grpc/support/sync.h include/grpc/support/sync_generic.h include/grpc/support/sync_posix.h include/grpc/support/sync_win32.h include/grpc/support/thd.h include/grpc/support/time.h include/grpc/support/tls.h include/grpc/support/tls_gcc.h include/grpc/support/tls_msvc.h include/grpc/support/tls_pthread.h include/grpc/support/useful.h
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses
diff --git a/tools/doxygen/Doxyfile.core.internal b/tools/doxygen/Doxyfile.core.internal
index 3812f67..af019e5 100644
--- a/tools/doxygen/Doxyfile.core.internal
+++ b/tools/doxygen/Doxyfile.core.internal
@@ -760,7 +760,7 @@
 # spaces.
 # Note: If this tag is empty the current directory is searched.
 
-INPUT                  = include/grpc/grpc_security.h include/grpc/byte_buffer.h include/grpc/byte_buffer_reader.h include/grpc/grpc.h include/grpc/status.h include/grpc/census.h src/core/httpcli/format_request.h src/core/httpcli/httpcli.h src/core/httpcli/httpcli_security_connector.h src/core/httpcli/parser.h src/core/security/auth_filters.h src/core/security/base64.h src/core/security/credentials.h src/core/security/json_token.h src/core/security/secure_endpoint.h src/core/security/secure_transport_setup.h src/core/security/security_connector.h src/core/security/security_context.h src/core/tsi/fake_transport_security.h src/core/tsi/ssl_transport_security.h src/core/tsi/transport_security.h src/core/tsi/transport_security_interface.h src/core/census/grpc_context.h src/core/channel/channel_args.h src/core/channel/channel_stack.h src/core/channel/child_channel.h src/core/channel/client_channel.h src/core/channel/client_setup.h src/core/channel/connected_channel.h src/core/channel/http_client_filter.h src/core/channel/http_server_filter.h src/core/channel/noop_filter.h src/core/compression/algorithm.h src/core/compression/message_compress.h src/core/debug/trace.h src/core/iomgr/alarm.h src/core/iomgr/alarm_heap.h src/core/iomgr/alarm_internal.h src/core/iomgr/endpoint.h src/core/iomgr/endpoint_pair.h src/core/iomgr/fd_posix.h src/core/iomgr/iocp_windows.h src/core/iomgr/iomgr.h src/core/iomgr/iomgr_internal.h src/core/iomgr/iomgr_posix.h src/core/iomgr/pollset.h src/core/iomgr/pollset_kick.h src/core/iomgr/pollset_kick_posix.h src/core/iomgr/pollset_kick_windows.h src/core/iomgr/pollset_posix.h src/core/iomgr/pollset_windows.h src/core/iomgr/resolve_address.h src/core/iomgr/sockaddr.h src/core/iomgr/sockaddr_posix.h src/core/iomgr/sockaddr_utils.h src/core/iomgr/sockaddr_win32.h src/core/iomgr/socket_utils_posix.h src/core/iomgr/socket_windows.h src/core/iomgr/tcp_client.h src/core/iomgr/tcp_posix.h src/core/iomgr/tcp_server.h src/core/iomgr/tcp_windows.h src/core/iomgr/time_averaged_stats.h src/core/iomgr/wakeup_fd_pipe.h src/core/iomgr/wakeup_fd_posix.h src/core/json/json.h src/core/json/json_common.h src/core/json/json_reader.h src/core/json/json_writer.h src/core/profiling/timers.h src/core/profiling/timers_preciseclock.h src/core/surface/byte_buffer_queue.h src/core/surface/call.h src/core/surface/channel.h src/core/surface/client.h src/core/surface/completion_queue.h src/core/surface/event_string.h src/core/surface/init.h src/core/surface/server.h src/core/surface/surface_trace.h src/core/transport/chttp2/alpn.h src/core/transport/chttp2/bin_encoder.h src/core/transport/chttp2/frame.h src/core/transport/chttp2/frame_data.h src/core/transport/chttp2/frame_goaway.h src/core/transport/chttp2/frame_ping.h src/core/transport/chttp2/frame_rst_stream.h src/core/transport/chttp2/frame_settings.h src/core/transport/chttp2/frame_window_update.h src/core/transport/chttp2/hpack_parser.h src/core/transport/chttp2/hpack_table.h src/core/transport/chttp2/http2_errors.h src/core/transport/chttp2/huffsyms.h src/core/transport/chttp2/status_conversion.h src/core/transport/chttp2/stream_encoder.h src/core/transport/chttp2/stream_map.h src/core/transport/chttp2/timeout_encoding.h src/core/transport/chttp2/varint.h src/core/transport/chttp2_transport.h src/core/transport/metadata.h src/core/transport/stream_op.h src/core/transport/transport.h src/core/transport/transport_impl.h src/core/census/context.h src/core/httpcli/format_request.c src/core/httpcli/httpcli.c src/core/httpcli/httpcli_security_connector.c src/core/httpcli/parser.c src/core/security/base64.c src/core/security/client_auth_filter.c src/core/security/credentials.c src/core/security/credentials_metadata.c src/core/security/credentials_posix.c src/core/security/credentials_win32.c src/core/security/google_default_credentials.c src/core/security/json_token.c src/core/security/secure_endpoint.c src/core/security/secure_transport_setup.c src/core/security/security_connector.c src/core/security/security_context.c src/core/security/server_auth_filter.c src/core/security/server_secure_chttp2.c src/core/surface/init_secure.c src/core/surface/secure_channel_create.c src/core/tsi/fake_transport_security.c src/core/tsi/ssl_transport_security.c src/core/tsi/transport_security.c src/core/census/grpc_context.c src/core/channel/channel_args.c src/core/channel/channel_stack.c src/core/channel/child_channel.c src/core/channel/client_channel.c src/core/channel/client_setup.c src/core/channel/connected_channel.c src/core/channel/http_client_filter.c src/core/channel/http_server_filter.c src/core/channel/noop_filter.c src/core/compression/algorithm.c src/core/compression/message_compress.c src/core/debug/trace.c src/core/iomgr/alarm.c src/core/iomgr/alarm_heap.c src/core/iomgr/endpoint.c src/core/iomgr/endpoint_pair_posix.c src/core/iomgr/endpoint_pair_windows.c src/core/iomgr/fd_posix.c src/core/iomgr/iocp_windows.c src/core/iomgr/iomgr.c src/core/iomgr/iomgr_posix.c src/core/iomgr/iomgr_windows.c src/core/iomgr/pollset_kick.c src/core/iomgr/pollset_multipoller_with_epoll.c src/core/iomgr/pollset_multipoller_with_poll_posix.c src/core/iomgr/pollset_posix.c src/core/iomgr/pollset_windows.c src/core/iomgr/resolve_address_posix.c src/core/iomgr/resolve_address_windows.c src/core/iomgr/sockaddr_utils.c src/core/iomgr/socket_utils_common_posix.c src/core/iomgr/socket_utils_linux.c src/core/iomgr/socket_utils_posix.c src/core/iomgr/socket_windows.c src/core/iomgr/tcp_client_posix.c src/core/iomgr/tcp_client_windows.c src/core/iomgr/tcp_posix.c src/core/iomgr/tcp_server_posix.c src/core/iomgr/tcp_server_windows.c src/core/iomgr/tcp_windows.c src/core/iomgr/time_averaged_stats.c src/core/iomgr/wakeup_fd_eventfd.c src/core/iomgr/wakeup_fd_nospecial.c src/core/iomgr/wakeup_fd_pipe.c src/core/iomgr/wakeup_fd_posix.c src/core/json/json.c src/core/json/json_reader.c src/core/json/json_string.c src/core/json/json_writer.c src/core/profiling/basic_timers.c src/core/profiling/stap_timers.c src/core/surface/byte_buffer.c src/core/surface/byte_buffer_queue.c src/core/surface/byte_buffer_reader.c src/core/surface/call.c src/core/surface/call_details.c src/core/surface/call_log_batch.c src/core/surface/channel.c src/core/surface/channel_create.c src/core/surface/client.c src/core/surface/completion_queue.c src/core/surface/event_string.c src/core/surface/init.c src/core/surface/lame_client.c src/core/surface/metadata_array.c src/core/surface/server.c src/core/surface/server_chttp2.c src/core/surface/server_create.c src/core/surface/surface_trace.c src/core/transport/chttp2/alpn.c src/core/transport/chttp2/bin_encoder.c src/core/transport/chttp2/frame_data.c src/core/transport/chttp2/frame_goaway.c src/core/transport/chttp2/frame_ping.c src/core/transport/chttp2/frame_rst_stream.c src/core/transport/chttp2/frame_settings.c src/core/transport/chttp2/frame_window_update.c src/core/transport/chttp2/hpack_parser.c src/core/transport/chttp2/hpack_table.c src/core/transport/chttp2/huffsyms.c src/core/transport/chttp2/status_conversion.c src/core/transport/chttp2/stream_encoder.c src/core/transport/chttp2/stream_map.c src/core/transport/chttp2/timeout_encoding.c src/core/transport/chttp2/varint.c src/core/transport/chttp2_transport.c src/core/transport/metadata.c src/core/transport/stream_op.c src/core/transport/transport.c src/core/transport/transport_op_string.c src/core/census/context.c src/core/census/initialize.c include/grpc/support/alloc.h include/grpc/support/atm.h include/grpc/support/atm_gcc_atomic.h include/grpc/support/atm_gcc_sync.h include/grpc/support/atm_win32.h include/grpc/support/cancellable_platform.h include/grpc/support/cmdline.h include/grpc/support/cpu.h include/grpc/support/histogram.h include/grpc/support/host_port.h include/grpc/support/log.h include/grpc/support/log_win32.h include/grpc/support/port_platform.h include/grpc/support/slice.h include/grpc/support/slice_buffer.h include/grpc/support/string_util.h include/grpc/support/subprocess.h include/grpc/support/sync.h include/grpc/support/sync_generic.h include/grpc/support/sync_posix.h include/grpc/support/sync_win32.h include/grpc/support/thd.h include/grpc/support/time.h include/grpc/support/tls.h include/grpc/support/tls_gcc.h include/grpc/support/tls_msvc.h include/grpc/support/tls_pthread.h include/grpc/support/useful.h src/core/support/env.h src/core/support/file.h src/core/support/murmur_hash.h src/core/support/string.h src/core/support/string_win32.h src/core/support/thd_internal.h src/core/support/alloc.c src/core/support/cancellable.c src/core/support/cmdline.c src/core/support/cpu_iphone.c src/core/support/cpu_linux.c src/core/support/cpu_posix.c src/core/support/cpu_windows.c src/core/support/env_linux.c src/core/support/env_posix.c src/core/support/env_win32.c src/core/support/file.c src/core/support/file_posix.c src/core/support/file_win32.c src/core/support/histogram.c src/core/support/host_port.c src/core/support/log.c src/core/support/log_android.c src/core/support/log_linux.c src/core/support/log_posix.c src/core/support/log_win32.c src/core/support/murmur_hash.c src/core/support/slice.c src/core/support/slice_buffer.c src/core/support/string.c src/core/support/string_posix.c src/core/support/string_win32.c src/core/support/subprocess_posix.c src/core/support/sync.c src/core/support/sync_posix.c src/core/support/sync_win32.c src/core/support/thd.c src/core/support/thd_posix.c src/core/support/thd_win32.c src/core/support/time.c src/core/support/time_posix.c src/core/support/time_win32.c src/core/support/tls_pthread.c
+INPUT                  = include/grpc/grpc_security.h include/grpc/byte_buffer.h include/grpc/byte_buffer_reader.h include/grpc/compression.h include/grpc/grpc.h include/grpc/status.h include/grpc/census.h src/core/httpcli/format_request.h src/core/httpcli/httpcli.h src/core/httpcli/httpcli_security_connector.h src/core/httpcli/parser.h src/core/security/auth_filters.h src/core/security/base64.h src/core/security/credentials.h src/core/security/json_token.h src/core/security/secure_endpoint.h src/core/security/secure_transport_setup.h src/core/security/security_connector.h src/core/security/security_context.h src/core/tsi/fake_transport_security.h src/core/tsi/ssl_transport_security.h src/core/tsi/transport_security.h src/core/tsi/transport_security_interface.h src/core/census/grpc_context.h src/core/channel/channel_args.h src/core/channel/channel_stack.h src/core/channel/child_channel.h src/core/channel/client_channel.h src/core/channel/client_setup.h src/core/channel/connected_channel.h src/core/channel/http_client_filter.h src/core/channel/http_server_filter.h src/core/channel/noop_filter.h src/core/compression/message_compress.h src/core/debug/trace.h src/core/iomgr/alarm.h src/core/iomgr/alarm_heap.h src/core/iomgr/alarm_internal.h src/core/iomgr/endpoint.h src/core/iomgr/endpoint_pair.h src/core/iomgr/fd_posix.h src/core/iomgr/iocp_windows.h src/core/iomgr/iomgr.h src/core/iomgr/iomgr_internal.h src/core/iomgr/iomgr_posix.h src/core/iomgr/pollset.h src/core/iomgr/pollset_kick.h src/core/iomgr/pollset_kick_posix.h src/core/iomgr/pollset_kick_windows.h src/core/iomgr/pollset_posix.h src/core/iomgr/pollset_windows.h src/core/iomgr/resolve_address.h src/core/iomgr/sockaddr.h src/core/iomgr/sockaddr_posix.h src/core/iomgr/sockaddr_utils.h src/core/iomgr/sockaddr_win32.h src/core/iomgr/socket_utils_posix.h src/core/iomgr/socket_windows.h src/core/iomgr/tcp_client.h src/core/iomgr/tcp_posix.h src/core/iomgr/tcp_server.h src/core/iomgr/tcp_windows.h src/core/iomgr/time_averaged_stats.h src/core/iomgr/wakeup_fd_pipe.h src/core/iomgr/wakeup_fd_posix.h src/core/json/json.h src/core/json/json_common.h src/core/json/json_reader.h src/core/json/json_writer.h src/core/profiling/timers.h src/core/profiling/timers_preciseclock.h src/core/surface/byte_buffer_queue.h src/core/surface/call.h src/core/surface/channel.h src/core/surface/client.h src/core/surface/completion_queue.h src/core/surface/event_string.h src/core/surface/init.h src/core/surface/server.h src/core/surface/surface_trace.h src/core/transport/chttp2/alpn.h src/core/transport/chttp2/bin_encoder.h src/core/transport/chttp2/frame.h src/core/transport/chttp2/frame_data.h src/core/transport/chttp2/frame_goaway.h src/core/transport/chttp2/frame_ping.h src/core/transport/chttp2/frame_rst_stream.h src/core/transport/chttp2/frame_settings.h src/core/transport/chttp2/frame_window_update.h src/core/transport/chttp2/hpack_parser.h src/core/transport/chttp2/hpack_table.h src/core/transport/chttp2/http2_errors.h src/core/transport/chttp2/huffsyms.h src/core/transport/chttp2/status_conversion.h src/core/transport/chttp2/stream_encoder.h src/core/transport/chttp2/stream_map.h src/core/transport/chttp2/timeout_encoding.h src/core/transport/chttp2/varint.h src/core/transport/chttp2_transport.h src/core/transport/metadata.h src/core/transport/stream_op.h src/core/transport/transport.h src/core/transport/transport_impl.h src/core/census/context.h src/core/httpcli/format_request.c src/core/httpcli/httpcli.c src/core/httpcli/httpcli_security_connector.c src/core/httpcli/parser.c src/core/security/base64.c src/core/security/client_auth_filter.c src/core/security/credentials.c src/core/security/credentials_metadata.c src/core/security/credentials_posix.c src/core/security/credentials_win32.c src/core/security/google_default_credentials.c src/core/security/json_token.c src/core/security/secure_endpoint.c src/core/security/secure_transport_setup.c src/core/security/security_connector.c src/core/security/security_context.c src/core/security/server_auth_filter.c src/core/security/server_secure_chttp2.c src/core/surface/init_secure.c src/core/surface/secure_channel_create.c src/core/tsi/fake_transport_security.c src/core/tsi/ssl_transport_security.c src/core/tsi/transport_security.c src/core/census/grpc_context.c src/core/channel/channel_args.c src/core/channel/channel_stack.c src/core/channel/child_channel.c src/core/channel/client_channel.c src/core/channel/client_setup.c src/core/channel/connected_channel.c src/core/channel/http_client_filter.c src/core/channel/http_server_filter.c src/core/channel/noop_filter.c src/core/compression/algorithm.c src/core/compression/message_compress.c src/core/debug/trace.c src/core/iomgr/alarm.c src/core/iomgr/alarm_heap.c src/core/iomgr/endpoint.c src/core/iomgr/endpoint_pair_posix.c src/core/iomgr/endpoint_pair_windows.c src/core/iomgr/fd_posix.c src/core/iomgr/iocp_windows.c src/core/iomgr/iomgr.c src/core/iomgr/iomgr_posix.c src/core/iomgr/iomgr_windows.c src/core/iomgr/pollset_kick.c src/core/iomgr/pollset_multipoller_with_epoll.c src/core/iomgr/pollset_multipoller_with_poll_posix.c src/core/iomgr/pollset_posix.c src/core/iomgr/pollset_windows.c src/core/iomgr/resolve_address_posix.c src/core/iomgr/resolve_address_windows.c src/core/iomgr/sockaddr_utils.c src/core/iomgr/socket_utils_common_posix.c src/core/iomgr/socket_utils_linux.c src/core/iomgr/socket_utils_posix.c src/core/iomgr/socket_windows.c src/core/iomgr/tcp_client_posix.c src/core/iomgr/tcp_client_windows.c src/core/iomgr/tcp_posix.c src/core/iomgr/tcp_server_posix.c src/core/iomgr/tcp_server_windows.c src/core/iomgr/tcp_windows.c src/core/iomgr/time_averaged_stats.c src/core/iomgr/wakeup_fd_eventfd.c src/core/iomgr/wakeup_fd_nospecial.c src/core/iomgr/wakeup_fd_pipe.c src/core/iomgr/wakeup_fd_posix.c src/core/json/json.c src/core/json/json_reader.c src/core/json/json_string.c src/core/json/json_writer.c src/core/profiling/basic_timers.c src/core/profiling/stap_timers.c src/core/surface/byte_buffer.c src/core/surface/byte_buffer_queue.c src/core/surface/byte_buffer_reader.c src/core/surface/call.c src/core/surface/call_details.c src/core/surface/call_log_batch.c src/core/surface/channel.c src/core/surface/channel_create.c src/core/surface/client.c src/core/surface/completion_queue.c src/core/surface/event_string.c src/core/surface/init.c src/core/surface/lame_client.c src/core/surface/metadata_array.c src/core/surface/server.c src/core/surface/server_chttp2.c src/core/surface/server_create.c src/core/surface/surface_trace.c src/core/transport/chttp2/alpn.c src/core/transport/chttp2/bin_encoder.c src/core/transport/chttp2/frame_data.c src/core/transport/chttp2/frame_goaway.c src/core/transport/chttp2/frame_ping.c src/core/transport/chttp2/frame_rst_stream.c src/core/transport/chttp2/frame_settings.c src/core/transport/chttp2/frame_window_update.c src/core/transport/chttp2/hpack_parser.c src/core/transport/chttp2/hpack_table.c src/core/transport/chttp2/huffsyms.c src/core/transport/chttp2/status_conversion.c src/core/transport/chttp2/stream_encoder.c src/core/transport/chttp2/stream_map.c src/core/transport/chttp2/timeout_encoding.c src/core/transport/chttp2/varint.c src/core/transport/chttp2_transport.c src/core/transport/metadata.c src/core/transport/stream_op.c src/core/transport/transport.c src/core/transport/transport_op_string.c src/core/census/context.c src/core/census/initialize.c include/grpc/support/alloc.h include/grpc/support/atm.h include/grpc/support/atm_gcc_atomic.h include/grpc/support/atm_gcc_sync.h include/grpc/support/atm_win32.h include/grpc/support/cancellable_platform.h include/grpc/support/cmdline.h include/grpc/support/cpu.h include/grpc/support/histogram.h include/grpc/support/host_port.h include/grpc/support/log.h include/grpc/support/log_win32.h include/grpc/support/port_platform.h include/grpc/support/slice.h include/grpc/support/slice_buffer.h include/grpc/support/string_util.h include/grpc/support/subprocess.h include/grpc/support/sync.h include/grpc/support/sync_generic.h include/grpc/support/sync_posix.h include/grpc/support/sync_win32.h include/grpc/support/thd.h include/grpc/support/time.h include/grpc/support/tls.h include/grpc/support/tls_gcc.h include/grpc/support/tls_msvc.h include/grpc/support/tls_pthread.h include/grpc/support/useful.h src/core/support/env.h src/core/support/file.h src/core/support/murmur_hash.h src/core/support/string.h src/core/support/string_win32.h src/core/support/thd_internal.h src/core/support/alloc.c src/core/support/cancellable.c src/core/support/cmdline.c src/core/support/cpu_iphone.c src/core/support/cpu_linux.c src/core/support/cpu_posix.c src/core/support/cpu_windows.c src/core/support/env_linux.c src/core/support/env_posix.c src/core/support/env_win32.c src/core/support/file.c src/core/support/file_posix.c src/core/support/file_win32.c src/core/support/histogram.c src/core/support/host_port.c src/core/support/log.c src/core/support/log_android.c src/core/support/log_linux.c src/core/support/log_posix.c src/core/support/log_win32.c src/core/support/murmur_hash.c src/core/support/slice.c src/core/support/slice_buffer.c src/core/support/string.c src/core/support/string_posix.c src/core/support/string_win32.c src/core/support/subprocess_posix.c src/core/support/sync.c src/core/support/sync_posix.c src/core/support/sync_win32.c src/core/support/thd.c src/core/support/thd_posix.c src/core/support/thd_win32.c src/core/support/time.c src/core/support/time_posix.c src/core/support/time_win32.c src/core/support/tls_pthread.c
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses
diff --git a/vsprojects/grpc/grpc.vcxproj b/vsprojects/grpc/grpc.vcxproj
index 990962a..053a345 100644
--- a/vsprojects/grpc/grpc.vcxproj
+++ b/vsprojects/grpc/grpc.vcxproj
@@ -150,6 +150,7 @@
     <ClInclude Include="..\..\include\grpc\grpc_security.h" />
     <ClInclude Include="..\..\include\grpc\byte_buffer.h" />
     <ClInclude Include="..\..\include\grpc\byte_buffer_reader.h" />
+    <ClInclude Include="..\..\include\grpc\compression.h" />
     <ClInclude Include="..\..\include\grpc\grpc.h" />
     <ClInclude Include="..\..\include\grpc\status.h" />
     <ClInclude Include="..\..\include\grpc\census.h" />
@@ -181,7 +182,6 @@
     <ClInclude Include="..\..\src\core\channel\http_client_filter.h" />
     <ClInclude Include="..\..\src\core\channel\http_server_filter.h" />
     <ClInclude Include="..\..\src\core\channel\noop_filter.h" />
-    <ClInclude Include="..\..\src\core\compression\algorithm.h" />
     <ClInclude Include="..\..\src\core\compression\message_compress.h" />
     <ClInclude Include="..\..\src\core\debug\trace.h" />
     <ClInclude Include="..\..\src\core\iomgr\alarm.h" />
diff --git a/vsprojects/grpc/grpc.vcxproj.filters b/vsprojects/grpc/grpc.vcxproj.filters
index fd9980b..2ff19a9 100644
--- a/vsprojects/grpc/grpc.vcxproj.filters
+++ b/vsprojects/grpc/grpc.vcxproj.filters
@@ -360,6 +360,9 @@
     <ClInclude Include="..\..\include\grpc\byte_buffer_reader.h">
       <Filter>include\grpc</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\include\grpc\compression.h">
+      <Filter>include\grpc</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\include\grpc\grpc.h">
       <Filter>include\grpc</Filter>
     </ClInclude>
@@ -449,9 +452,6 @@
     <ClInclude Include="..\..\src\core\channel\noop_filter.h">
       <Filter>src\core\channel</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\core\compression\algorithm.h">
-      <Filter>src\core\compression</Filter>
-    </ClInclude>
     <ClInclude Include="..\..\src\core\compression\message_compress.h">
       <Filter>src\core\compression</Filter>
     </ClInclude>
diff --git a/vsprojects/grpc_unsecure/grpc_unsecure.vcxproj b/vsprojects/grpc_unsecure/grpc_unsecure.vcxproj
index 06ae731..0f12c25 100644
--- a/vsprojects/grpc_unsecure/grpc_unsecure.vcxproj
+++ b/vsprojects/grpc_unsecure/grpc_unsecure.vcxproj
@@ -148,6 +148,7 @@
   <ItemGroup>
     <ClInclude Include="..\..\include\grpc\byte_buffer.h" />
     <ClInclude Include="..\..\include\grpc\byte_buffer_reader.h" />
+    <ClInclude Include="..\..\include\grpc\compression.h" />
     <ClInclude Include="..\..\include\grpc\grpc.h" />
     <ClInclude Include="..\..\include\grpc\status.h" />
     <ClInclude Include="..\..\include\grpc\census.h" />
@@ -163,7 +164,6 @@
     <ClInclude Include="..\..\src\core\channel\http_client_filter.h" />
     <ClInclude Include="..\..\src\core\channel\http_server_filter.h" />
     <ClInclude Include="..\..\src\core\channel\noop_filter.h" />
-    <ClInclude Include="..\..\src\core\compression\algorithm.h" />
     <ClInclude Include="..\..\src\core\compression\message_compress.h" />
     <ClInclude Include="..\..\src\core\debug\trace.h" />
     <ClInclude Include="..\..\src\core\iomgr\alarm.h" />
diff --git a/vsprojects/grpc_unsecure/grpc_unsecure.vcxproj.filters b/vsprojects/grpc_unsecure/grpc_unsecure.vcxproj.filters
index 1603757..47810a9 100644
--- a/vsprojects/grpc_unsecure/grpc_unsecure.vcxproj.filters
+++ b/vsprojects/grpc_unsecure/grpc_unsecure.vcxproj.filters
@@ -291,6 +291,9 @@
     <ClInclude Include="..\..\include\grpc\byte_buffer_reader.h">
       <Filter>include\grpc</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\include\grpc\compression.h">
+      <Filter>include\grpc</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\include\grpc\grpc.h">
       <Filter>include\grpc</Filter>
     </ClInclude>
@@ -332,9 +335,6 @@
     <ClInclude Include="..\..\src\core\channel\noop_filter.h">
       <Filter>src\core\channel</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\core\compression\algorithm.h">
-      <Filter>src\core\compression</Filter>
-    </ClInclude>
     <ClInclude Include="..\..\src\core\compression\message_compress.h">
       <Filter>src\core\compression</Filter>
     </ClInclude>