Merge branch 'bye-bye-completion-queue-pie' into we-dont-need-no-backup
diff --git a/test/core/end2end/cq_verifier.c b/test/core/end2end/cq_verifier.c
index f291e73..6648025 100644
--- a/test/core/end2end/cq_verifier.c
+++ b/test/core/end2end/cq_verifier.c
@@ -45,6 +45,8 @@
 #include <grpc/support/time.h>
 #include <grpc/support/useful.h>
 
+#define ROOT_EXPECTATION 1000
+
 /* a set of metadata we expect to find on an event */
 typedef struct metadata {
   size_t count;
@@ -60,9 +62,7 @@
   struct expectation *prev;
   grpc_completion_type type;
   void *tag;
-  union {
-    grpc_op_error op_complete;
-  } data;
+  int success;
 } expectation;
 
 /* the verifier itself */
@@ -75,7 +75,7 @@
 
 cq_verifier *cq_verifier_create(grpc_completion_queue *cq) {
   cq_verifier *v = gpr_malloc(sizeof(cq_verifier));
-  v->expect.type = GRPC_COMPLETION_DO_NOT_USE;
+  v->expect.type = ROOT_EXPECTATION;
   v->expect.tag = NULL;
   v->expect.next = &v->expect;
   v->expect.prev = &v->expect;
@@ -149,11 +149,9 @@
       abort();
       break;
     case GRPC_OP_COMPLETE:
-      GPR_ASSERT(e->data.op_complete == ev->data.op_complete);
+      GPR_ASSERT(e->success == ev->success);
       break;
-    case GRPC_SERVER_SHUTDOWN:
-      break;
-    case GRPC_COMPLETION_DO_NOT_USE:
+    case GRPC_QUEUE_TIMEOUT:
       gpr_log(GPR_ERROR, "not implemented");
       abort();
       break;
@@ -165,13 +163,10 @@
 
   switch (e->type) {
     case GRPC_OP_COMPLETE:
-      gpr_asprintf(&tmp, "GRPC_OP_COMPLETE result=%d", e->data.op_complete);
+      gpr_asprintf(&tmp, "GRPC_OP_COMPLETE result=%d", e->success);
       gpr_strvec_add(buf, tmp);
       break;
-    case GRPC_SERVER_SHUTDOWN:
-      gpr_strvec_add(buf, gpr_strdup("GRPC_SERVER_SHUTDOWN"));
-      break;
-    case GRPC_COMPLETION_DO_NOT_USE:
+    case GRPC_QUEUE_TIMEOUT:
     case GRPC_QUEUE_SHUTDOWN:
       gpr_log(GPR_ERROR, "not implemented");
       abort();
@@ -203,7 +198,7 @@
 
 void cq_verify(cq_verifier *v) {
   gpr_timespec deadline = GRPC_TIMEOUT_SECONDS_TO_DEADLINE(10);
-  grpc_event *ev;
+  grpc_event ev;
   expectation *e;
   char *s;
   gpr_strvec have_tags;
@@ -212,15 +207,16 @@
 
   while (v->expect.next != &v->expect) {
     ev = grpc_completion_queue_next(v->cq, deadline);
-    if (!ev) {
+    if (ev.type == GRPC_QUEUE_TIMEOUT) {
       fail_no_event_received(v);
+      break;
     }
 
     for (e = v->expect.next; e != &v->expect; e = e->next) {
       gpr_asprintf(&s, " %p", e->tag);
       gpr_strvec_add(&have_tags, s);
-      if (e->tag == ev->tag) {
-        verify_matches(e, ev);
+      if (e->tag == ev.tag) {
+        verify_matches(e, &ev);
         e->next->prev = e->prev;
         e->prev->next = e->next;
         gpr_free(e);
@@ -228,7 +224,7 @@
       }
     }
     if (e == &v->expect) {
-      s = grpc_event_string(ev);
+      s = grpc_event_string(&ev);
       gpr_log(GPR_ERROR, "event not found: %s", s);
       gpr_free(s);
       s = gpr_strvec_flatten(&have_tags, NULL);
@@ -237,8 +233,6 @@
       gpr_strvec_destroy(&have_tags);
       abort();
     }
-
-    grpc_event_finish(ev);
   }
 
   gpr_strvec_destroy(&have_tags);
@@ -246,13 +240,13 @@
 
 void cq_verify_empty(cq_verifier *v) {
   gpr_timespec deadline = gpr_time_add(gpr_now(), gpr_time_from_seconds(1));
-  grpc_event *ev;
+  grpc_event ev;
 
   GPR_ASSERT(v->expect.next == &v->expect && "expectation queue must be empty");
 
   ev = grpc_completion_queue_next(v->cq, deadline);
-  if (ev != NULL) {
-    char *s = grpc_event_string(ev);
+  if (ev.type != GRPC_QUEUE_TIMEOUT) {
+    char *s = grpc_event_string(&ev);
     gpr_log(GPR_ERROR, "unexpected event (expected nothing): %s", s);
     gpr_free(s);
     abort();
@@ -269,10 +263,6 @@
   return e;
 }
 
-void cq_expect_completion(cq_verifier *v, void *tag, grpc_op_error result) {
-  add(v, GRPC_OP_COMPLETE, tag)->data.op_complete = result;
-}
-
-void cq_expect_server_shutdown(cq_verifier *v, void *tag) {
-  add(v, GRPC_SERVER_SHUTDOWN, tag);
+void cq_expect_completion(cq_verifier *v, void *tag, int success) {
+  add(v, GRPC_OP_COMPLETE, tag)->success = success;
 }
diff --git a/test/core/end2end/cq_verifier.h b/test/core/end2end/cq_verifier.h
index bae3c6c..1ecd4db 100644
--- a/test/core/end2end/cq_verifier.h
+++ b/test/core/end2end/cq_verifier.h
@@ -57,8 +57,7 @@
    Any functions taking ... expect a NULL terminated list of key/value pairs
    (each pair using two parameter slots) of metadata that MUST be present in
    the event. */
-void cq_expect_completion(cq_verifier *v, void *tag, grpc_op_error result);
-void cq_expect_server_shutdown(cq_verifier *v, void *tag);
+void cq_expect_completion(cq_verifier *v, void *tag, int success);
 
 int byte_buffer_eq_string(grpc_byte_buffer *byte_buffer, const char *string);
 int contains_metadata(grpc_metadata_array *array, const char *key, const char *value);
diff --git a/test/core/end2end/dualstack_socket_test.c b/test/core/end2end/dualstack_socket_test.c
index d418ea8..b54b8ec 100644
--- a/test/core/end2end/dualstack_socket_test.c
+++ b/test/core/end2end/dualstack_socket_test.c
@@ -50,15 +50,10 @@
 }
 
 static void drain_cq(grpc_completion_queue *cq) {
-  grpc_event *ev;
-  grpc_completion_type type;
+  grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, ms_from_now(5000));
-    GPR_ASSERT(ev);
-    type = ev->type;
-    grpc_event_finish(ev);
-    gpr_log(GPR_INFO, "Drained event type %d", type);
-  } while (type != GRPC_QUEUE_SHUTDOWN);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
 void test_connect(const char *server_host, const char *client_host, int port,
@@ -156,7 +151,7 @@
                grpc_server_request_call(server, &s, &call_details,
                                         &request_metadata_recv, cq,
                                         cq, tag(101)));
-    cq_expect_completion(cqv, tag(101), GRPC_OP_OK);
+    cq_expect_completion(cqv, tag(101), 1);
     cq_verify(cqv);
 
     op = ops;
@@ -174,8 +169,8 @@
     GPR_ASSERT(GRPC_CALL_OK ==
                grpc_call_start_batch(s, ops, op - ops, tag(102)));
 
-    cq_expect_completion(cqv, tag(102), GRPC_OP_OK);
-    cq_expect_completion(cqv, tag(1), GRPC_OP_OK);
+    cq_expect_completion(cqv, tag(102), 1);
+    cq_expect_completion(cqv, tag(1), 1);
     cq_verify(cqv);
 
     GPR_ASSERT(status == GRPC_STATUS_UNIMPLEMENTED);
@@ -187,7 +182,7 @@
     grpc_call_destroy(s);
   } else {
     /* Check for a failed connection. */
-    cq_expect_completion(cqv, tag(1), GRPC_OP_OK);
+    cq_expect_completion(cqv, tag(1), 1);
     cq_verify(cqv);
 
     GPR_ASSERT(status == GRPC_STATUS_DEADLINE_EXCEEDED);
diff --git a/test/core/end2end/no_server_test.c b/test/core/end2end/no_server_test.c
index b292620..bba9cd1 100644
--- a/test/core/end2end/no_server_test.c
+++ b/test/core/end2end/no_server_test.c
@@ -45,8 +45,6 @@
   gpr_timespec deadline = GRPC_TIMEOUT_SECONDS_TO_DEADLINE(2);
   grpc_completion_queue *cq;
   cq_verifier *cqv;
-  grpc_event *ev;
-  int done;
   grpc_op ops[6];
   grpc_op *op;
   grpc_metadata_array trailing_metadata_recv;
@@ -79,17 +77,15 @@
   GPR_ASSERT(GRPC_CALL_OK ==
              grpc_call_start_batch(call, ops, op - ops, tag(1)));
   /* verify that all tags get completed */
-  cq_expect_completion(cqv, tag(1), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(1), 1);
   cq_verify(cqv);
 
   GPR_ASSERT(status == GRPC_STATUS_DEADLINE_EXCEEDED);
 
   grpc_completion_queue_shutdown(cq);
-  for (done = 0; !done;) {
-    ev = grpc_completion_queue_next(cq, gpr_inf_future);
-    done = ev->type == GRPC_QUEUE_SHUTDOWN;
-    grpc_event_finish(ev);
-  }
+  while (grpc_completion_queue_next(cq, gpr_inf_future).type !=
+         GRPC_QUEUE_SHUTDOWN)
+    ;
   grpc_completion_queue_destroy(cq);
   grpc_call_destroy(call);
   grpc_channel_destroy(chan);
diff --git a/test/core/end2end/tests/bad_hostname.c b/test/core/end2end/tests/bad_hostname.c
index d9971a6..726bada 100644
--- a/test/core/end2end/tests/bad_hostname.c
+++ b/test/core/end2end/tests/bad_hostname.c
@@ -68,14 +68,10 @@
 static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }
 
 static void drain_cq(grpc_completion_queue *cq) {
-  grpc_event *ev;
-  grpc_completion_type type;
+  grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, five_seconds_time());
-    GPR_ASSERT(ev);
-    type = ev->type;
-    grpc_event_finish(ev);
-  } while (type != GRPC_QUEUE_SHUTDOWN);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
 static void shutdown_server(grpc_end2end_test_fixture *f) {
@@ -140,7 +136,7 @@
   op++;
   GPR_ASSERT(GRPC_CALL_OK == grpc_call_start_batch(c, ops, op - ops, tag(1)));
 
-  cq_expect_completion(cqv, tag(1), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(1), 1);
   cq_verify(cqv);
 
   GPR_ASSERT(status == GRPC_STATUS_UNAUTHENTICATED);
diff --git a/test/core/end2end/tests/cancel_after_accept.c b/test/core/end2end/tests/cancel_after_accept.c
index 8ae53b7..db6d089 100644
--- a/test/core/end2end/tests/cancel_after_accept.c
+++ b/test/core/end2end/tests/cancel_after_accept.c
@@ -67,14 +67,10 @@
 static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }
 
 static void drain_cq(grpc_completion_queue *cq) {
-  grpc_event *ev;
-  grpc_completion_type type;
+  grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, five_seconds_time());
-    GPR_ASSERT(ev);
-    type = ev->type;
-    grpc_event_finish(ev);
-  } while (type != GRPC_QUEUE_SHUTDOWN);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
 static void shutdown_server(grpc_end2end_test_fixture *f) {
@@ -160,7 +156,7 @@
              grpc_server_request_call(f.server, &s, &call_details,
                                       &request_metadata_recv, f.cq,
                                       f.cq, tag(2)));
-  cq_expect_completion(cqv, tag(2), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(2), 1);
   cq_verify(cqv);
 
   op = ops;
@@ -180,8 +176,8 @@
 
   GPR_ASSERT(GRPC_CALL_OK == mode.initiate_cancel(c));
 
-  cq_expect_completion(cqv, tag(3), GRPC_OP_OK);
-  cq_expect_completion(cqv, tag(1), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(3), 1);
+  cq_expect_completion(cqv, tag(1), 1);
   cq_verify(cqv);
 
   GPR_ASSERT(status == mode.expect_status);
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 4b7fdd6..0162df7 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
@@ -67,14 +67,10 @@
 static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }
 
 static void drain_cq(grpc_completion_queue *cq) {
-  grpc_event *ev;
-  grpc_completion_type type;
+  grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, five_seconds_time());
-    GPR_ASSERT(ev);
-    type = ev->type;
-    grpc_event_finish(ev);
-  } while (type != GRPC_QUEUE_SHUTDOWN);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
 static void shutdown_server(grpc_end2end_test_fixture *f) {
@@ -162,7 +158,7 @@
              grpc_server_request_call(f.server, &s, &call_details,
                                       &request_metadata_recv, f.cq,
                                       f.cq, tag(2)));
-  cq_expect_completion(cqv, tag(2), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(2), 1);
   cq_verify(cqv);
 
   op = ops;
@@ -182,8 +178,8 @@
 
   GPR_ASSERT(GRPC_CALL_OK == mode.initiate_cancel(c));
 
-  cq_expect_completion(cqv, tag(3), GRPC_OP_OK);
-  cq_expect_completion(cqv, tag(1), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(3), 1);
+  cq_expect_completion(cqv, tag(1), 1);
   cq_verify(cqv);
 
   GPR_ASSERT(status == mode.expect_status);
diff --git a/test/core/end2end/tests/cancel_after_invoke.c b/test/core/end2end/tests/cancel_after_invoke.c
index 7ee4350..cf12269 100644
--- a/test/core/end2end/tests/cancel_after_invoke.c
+++ b/test/core/end2end/tests/cancel_after_invoke.c
@@ -68,14 +68,10 @@
 static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }
 
 static void drain_cq(grpc_completion_queue *cq) {
-  grpc_event *ev;
-  grpc_completion_type type;
+  grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, five_seconds_time());
-    GPR_ASSERT(ev);
-    type = ev->type;
-    grpc_event_finish(ev);
-  } while (type != GRPC_QUEUE_SHUTDOWN);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
 static void shutdown_server(grpc_end2end_test_fixture *f) {
@@ -156,7 +152,7 @@
 
   GPR_ASSERT(GRPC_CALL_OK == mode.initiate_cancel(c));
 
-  cq_expect_completion(cqv, tag(1), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(1), 1);
   cq_verify(cqv);
 
   GPR_ASSERT(status == mode.expect_status);
diff --git a/test/core/end2end/tests/cancel_before_invoke.c b/test/core/end2end/tests/cancel_before_invoke.c
index 8a53e18..19d3bad 100644
--- a/test/core/end2end/tests/cancel_before_invoke.c
+++ b/test/core/end2end/tests/cancel_before_invoke.c
@@ -66,14 +66,10 @@
 static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }
 
 static void drain_cq(grpc_completion_queue *cq) {
-  grpc_event *ev;
-  grpc_completion_type type;
+  grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, five_seconds_time());
-    GPR_ASSERT(ev);
-    type = ev->type;
-    grpc_event_finish(ev);
-  } while (type != GRPC_QUEUE_SHUTDOWN);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
 static void shutdown_server(grpc_end2end_test_fixture *f) {
@@ -153,7 +149,7 @@
   op++;
   GPR_ASSERT(GRPC_CALL_OK == grpc_call_start_batch(c, ops, test_ops, tag(1)));
 
-  cq_expect_completion(cqv, tag(1), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(1), 1);
   cq_verify(cqv);
 
   GPR_ASSERT(status == GRPC_STATUS_CANCELLED);
diff --git a/test/core/end2end/tests/cancel_in_a_vacuum.c b/test/core/end2end/tests/cancel_in_a_vacuum.c
index 467a621..679b137 100644
--- a/test/core/end2end/tests/cancel_in_a_vacuum.c
+++ b/test/core/end2end/tests/cancel_in_a_vacuum.c
@@ -65,14 +65,10 @@
 static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }
 
 static void drain_cq(grpc_completion_queue *cq) {
-  grpc_event *ev;
-  grpc_completion_type type;
+  grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, five_seconds_time());
-    GPR_ASSERT(ev);
-    type = ev->type;
-    grpc_event_finish(ev);
-  } while (type != GRPC_QUEUE_SHUTDOWN);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
 static void shutdown_server(grpc_end2end_test_fixture *f) {
diff --git a/test/core/end2end/tests/census_simple_request.c b/test/core/end2end/tests/census_simple_request.c
index 4f18eab..4f6c57c 100644
--- a/test/core/end2end/tests/census_simple_request.c
+++ b/test/core/end2end/tests/census_simple_request.c
@@ -74,14 +74,10 @@
 }
 
 static void drain_cq(grpc_completion_queue *cq) {
-  grpc_event *ev;
-  grpc_completion_type type;
+  grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, n_seconds_time(5));
-    GPR_ASSERT(ev);
-    type = ev->type;
-    grpc_event_finish(ev);
-  } while (type != GRPC_QUEUE_SHUTDOWN);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
 static void end_test(grpc_end2end_test_fixture *f) {
@@ -141,7 +137,7 @@
              grpc_server_request_call(f.server, &s, &call_details,
                                       &request_metadata_recv, f.cq,
                                       f.cq, tag(101)));
-  cq_expect_completion(cqv, tag(101), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(101), 1);
   cq_verify(cqv);
 
   op = ops;
@@ -158,8 +154,8 @@
   op++;
   GPR_ASSERT(GRPC_CALL_OK == grpc_call_start_batch(s, ops, op - ops, tag(102)));
 
-  cq_expect_completion(cqv, tag(102), GRPC_OP_OK);
-  cq_expect_completion(cqv, tag(1), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(102), 1);
+  cq_expect_completion(cqv, tag(1), 1);
   cq_verify(cqv);
 
   GPR_ASSERT(status == GRPC_STATUS_UNIMPLEMENTED);
diff --git a/test/core/end2end/tests/disappearing_server.c b/test/core/end2end/tests/disappearing_server.c
index 1e5560f..9bcc79d 100644
--- a/test/core/end2end/tests/disappearing_server.c
+++ b/test/core/end2end/tests/disappearing_server.c
@@ -54,14 +54,10 @@
 static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }
 
 static void drain_cq(grpc_completion_queue *cq) {
-  grpc_event *ev;
-  grpc_completion_type type;
+  grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, five_seconds_time());
-    GPR_ASSERT(ev);
-    type = ev->type;
-    grpc_event_finish(ev);
-  } while (type != GRPC_QUEUE_SHUTDOWN);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
 static void shutdown_server(grpc_end2end_test_fixture *f) {
@@ -132,7 +128,7 @@
              grpc_server_request_call(f->server, &s, &call_details,
                                       &request_metadata_recv, f->cq,
                                       f->cq, tag(101)));
-  cq_expect_completion(cqv, tag(101), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(101), 1);
   cq_verify(cqv);
 
   /* should be able to shut down the server early
@@ -153,8 +149,8 @@
   op++;
   GPR_ASSERT(GRPC_CALL_OK == grpc_call_start_batch(s, ops, op - ops, tag(102)));
 
-  cq_expect_completion(cqv, tag(102), GRPC_OP_OK);
-  cq_expect_completion(cqv, tag(1), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(102), 1);
+  cq_expect_completion(cqv, tag(1), 1);
   cq_verify(cqv);
 
   GPR_ASSERT(status == GRPC_STATUS_UNIMPLEMENTED);
diff --git a/test/core/end2end/tests/early_server_shutdown_finishes_inflight_calls.c b/test/core/end2end/tests/early_server_shutdown_finishes_inflight_calls.c
index 64f2f61..3efbf6a 100644
--- a/test/core/end2end/tests/early_server_shutdown_finishes_inflight_calls.c
+++ b/test/core/end2end/tests/early_server_shutdown_finishes_inflight_calls.c
@@ -66,14 +66,10 @@
 static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }
 
 static void drain_cq(grpc_completion_queue *cq) {
-  grpc_event *ev;
-  grpc_completion_type type;
+  grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, five_seconds_time());
-    GPR_ASSERT(ev);
-    type = ev->type;
-    grpc_event_finish(ev);
-  } while (type != GRPC_QUEUE_SHUTDOWN);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
 static void shutdown_server(grpc_end2end_test_fixture *f) {
@@ -147,7 +143,7 @@
              grpc_server_request_call(f.server, &s, &call_details,
                                       &request_metadata_recv, f.cq,
                                       f.cq, tag(101)));
-  cq_expect_completion(cqv, tag(101), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(101), 1);
   cq_verify(cqv);
 
   op = ops;
@@ -159,8 +155,8 @@
   /* shutdown and destroy the server */
   shutdown_server(&f);
 
-  cq_expect_completion(cqv, tag(102), GRPC_OP_OK);
-  cq_expect_completion(cqv, tag(1), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(102), 1);
+  cq_expect_completion(cqv, tag(1), 1);
   cq_verify(cqv);
 
   GPR_ASSERT(status == GRPC_STATUS_UNAVAILABLE);
diff --git a/test/core/end2end/tests/early_server_shutdown_finishes_tags.c b/test/core/end2end/tests/early_server_shutdown_finishes_tags.c
index b193820..c52e54b 100644
--- a/test/core/end2end/tests/early_server_shutdown_finishes_tags.c
+++ b/test/core/end2end/tests/early_server_shutdown_finishes_tags.c
@@ -66,14 +66,10 @@
 static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }
 
 static void drain_cq(grpc_completion_queue *cq) {
-  grpc_event *ev;
-  grpc_completion_type type;
+  grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, five_seconds_time());
-    GPR_ASSERT(ev);
-    type = ev->type;
-    grpc_event_finish(ev);
-  } while (type != GRPC_QUEUE_SHUTDOWN);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
 static void shutdown_server(grpc_end2end_test_fixture *f) {
@@ -116,7 +112,7 @@
                                       &request_metadata_recv, f.cq,
                                       f.cq, tag(101)));
   grpc_server_shutdown(f.server);
-  cq_expect_completion(cqv, tag(101), GRPC_OP_ERROR);
+  cq_expect_completion(cqv, tag(101), 0);
   cq_verify(cqv);
   GPR_ASSERT(s == NULL);
 
diff --git a/test/core/end2end/tests/empty_batch.c b/test/core/end2end/tests/empty_batch.c
index b3f24aa..f1c3fb2 100644
--- a/test/core/end2end/tests/empty_batch.c
+++ b/test/core/end2end/tests/empty_batch.c
@@ -68,14 +68,10 @@
 static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }
 
 static void drain_cq(grpc_completion_queue *cq) {
-  grpc_event *ev;
-  grpc_completion_type type;
+  grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, five_seconds_time());
-    GPR_ASSERT(ev);
-    type = ev->type;
-    grpc_event_finish(ev);
-  } while (type != GRPC_QUEUE_SHUTDOWN);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
 static void shutdown_server(grpc_end2end_test_fixture *f) {
@@ -111,7 +107,7 @@
   GPR_ASSERT(c);
 
   GPR_ASSERT(GRPC_CALL_OK == grpc_call_start_batch(c, op, 0, tag(1)));
-  cq_expect_completion(cqv, tag(1), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(1), 1);
   cq_verify(cqv);
 
   grpc_call_destroy(c);
diff --git a/test/core/end2end/tests/graceful_server_shutdown.c b/test/core/end2end/tests/graceful_server_shutdown.c
index b5a3906..70a0655 100644
--- a/test/core/end2end/tests/graceful_server_shutdown.c
+++ b/test/core/end2end/tests/graceful_server_shutdown.c
@@ -66,14 +66,10 @@
 static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }
 
 static void drain_cq(grpc_completion_queue *cq) {
-  grpc_event *ev;
-  grpc_completion_type type;
+  grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, five_seconds_time());
-    GPR_ASSERT(ev);
-    type = ev->type;
-    grpc_event_finish(ev);
-  } while (type != GRPC_QUEUE_SHUTDOWN);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
 static void shutdown_server(grpc_end2end_test_fixture *f) {
@@ -146,7 +142,7 @@
              grpc_server_request_call(f.server, &s, &call_details,
                                       &request_metadata_recv, f.cq,
                                       f.cq, tag(101)));
-  cq_expect_completion(cqv, tag(101), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(101), 1);
   cq_verify(cqv);
 
   /* shutdown and destroy the server */
@@ -167,12 +163,12 @@
   op++;
   GPR_ASSERT(GRPC_CALL_OK == grpc_call_start_batch(s, ops, op - ops, tag(102)));
 
-  cq_expect_completion(cqv, tag(102), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(102), 1);
   cq_verify(cqv);
 
   grpc_call_destroy(s);
-  cq_expect_server_shutdown(cqv, tag(0xdead));
-  cq_expect_completion(cqv, tag(1), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(0xdead), 1);
+  cq_expect_completion(cqv, tag(1), 1);
   cq_verify(cqv);
 
   GPR_ASSERT(status == GRPC_STATUS_UNIMPLEMENTED);
diff --git a/test/core/end2end/tests/invoke_large_request.c b/test/core/end2end/tests/invoke_large_request.c
index 6fbd78d..d4035d0 100644
--- a/test/core/end2end/tests/invoke_large_request.c
+++ b/test/core/end2end/tests/invoke_large_request.c
@@ -64,14 +64,10 @@
 }
 
 static void drain_cq(grpc_completion_queue *cq) {
-  grpc_event *ev;
-  grpc_completion_type type;
+  grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, n_seconds_time(5));
-    GPR_ASSERT(ev);
-    type = ev->type;
-    grpc_event_finish(ev);
-  } while (type != GRPC_QUEUE_SHUTDOWN);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
 static void shutdown_server(grpc_end2end_test_fixture *f) {
@@ -164,7 +160,7 @@
              grpc_server_request_call(f.server, &s, &call_details,
                                       &request_metadata_recv, f.cq,
                                       f.cq, tag(101)));
-  cq_expect_completion(cqv, tag(101), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(101), 1);
   cq_verify(cqv);
 
   op = ops;
@@ -187,8 +183,8 @@
   op++;
   GPR_ASSERT(GRPC_CALL_OK == grpc_call_start_batch(s, ops, op - ops, tag(102)));
 
-  cq_expect_completion(cqv, tag(102), GRPC_OP_OK);
-  cq_expect_completion(cqv, tag(1), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(102), 1);
+  cq_expect_completion(cqv, tag(1), 1);
   cq_verify(cqv);
 
   GPR_ASSERT(status == GRPC_STATUS_UNIMPLEMENTED);
diff --git a/test/core/end2end/tests/max_concurrent_streams.c b/test/core/end2end/tests/max_concurrent_streams.c
index 15b3c86..57300a0 100644
--- a/test/core/end2end/tests/max_concurrent_streams.c
+++ b/test/core/end2end/tests/max_concurrent_streams.c
@@ -66,14 +66,10 @@
 static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }
 
 static void drain_cq(grpc_completion_queue *cq) {
-  grpc_event *ev;
-  grpc_completion_type type;
+  grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, five_seconds_time());
-    GPR_ASSERT(ev);
-    type = ev->type;
-    grpc_event_finish(ev);
-  } while (type != GRPC_QUEUE_SHUTDOWN);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
 static void shutdown_server(grpc_end2end_test_fixture *f) {
@@ -144,7 +140,7 @@
              grpc_server_request_call(f.server, &s, &call_details,
                                       &request_metadata_recv, f.cq,
                                       f.cq, tag(101)));
-  cq_expect_completion(cqv, tag(101), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(101), 1);
   cq_verify(cqv);
 
   op = ops;
@@ -161,8 +157,8 @@
   op++;
   GPR_ASSERT(GRPC_CALL_OK == grpc_call_start_batch(s, ops, op - ops, tag(102)));
 
-  cq_expect_completion(cqv, tag(102), GRPC_OP_OK);
-  cq_expect_completion(cqv, tag(1), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(102), 1);
+  cq_expect_completion(cqv, tag(1), 1);
   cq_verify(cqv);
 
   GPR_ASSERT(status == GRPC_STATUS_UNIMPLEMENTED);
@@ -194,7 +190,7 @@
   int live_call;
   gpr_timespec deadline;
   cq_verifier *cqv;
-  grpc_event *ev;
+  grpc_event ev;
   grpc_call_details call_details;
   grpc_metadata_array request_metadata_recv;
   grpc_metadata_array initial_metadata_recv1;
@@ -297,26 +293,26 @@
 
   got_client_start = 0;
   got_server_start = 0;
+  live_call = -1;
   while (!got_client_start || !got_server_start) {
     ev = grpc_completion_queue_next(f.cq,
                                     GRPC_TIMEOUT_SECONDS_TO_DEADLINE(3));
-    GPR_ASSERT(ev);
-    GPR_ASSERT(ev->type == GRPC_OP_COMPLETE);
-    GPR_ASSERT(ev->data.op_complete == GRPC_OP_OK);
-    if (ev->tag == tag(101)) {
+    GPR_ASSERT(ev.type == GRPC_OP_COMPLETE);
+    GPR_ASSERT(ev.success);
+    if (ev.tag == tag(101)) {
       GPR_ASSERT(!got_server_start);
       got_server_start = 1;
     } else {
       GPR_ASSERT(!got_client_start);
-      GPR_ASSERT(ev->tag == tag(301) || ev->tag == tag(401));
+      GPR_ASSERT(ev.tag == tag(301) || ev.tag == tag(401));
       /* The /alpha or /beta calls started above could be invoked (but NOT both);
        * check this here */
       /* We'll get tag 303 or 403, we want 300, 400 */
-      live_call = ((int)(gpr_intptr)ev->tag) - 1;
+      live_call = ((int)(gpr_intptr)ev.tag) - 1;
       got_client_start = 1;
     }
-    grpc_event_finish(ev);
   }
+  GPR_ASSERT(live_call == 300 || live_call == 400);
 
   op = ops;
   op->op = GRPC_OP_SEND_INITIAL_METADATA;
@@ -333,18 +329,18 @@
   GPR_ASSERT(GRPC_CALL_OK ==
              grpc_call_start_batch(s1, ops, op - ops, tag(102)));
 
-  cq_expect_completion(cqv, tag(102), GRPC_OP_OK);
-  cq_expect_completion(cqv, tag(live_call + 2), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(102), 1);
+  cq_expect_completion(cqv, tag(live_call + 2), 1);
   /* first request is finished, we should be able to start the second */
   live_call = (live_call == 300) ? 400 : 300;
-  cq_expect_completion(cqv, tag(live_call + 1), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(live_call + 1), 1);
   cq_verify(cqv);
 
   GPR_ASSERT(GRPC_CALL_OK ==
              grpc_server_request_call(f.server, &s2, &call_details,
                                       &request_metadata_recv, f.cq,
                                       f.cq, tag(201)));
-  cq_expect_completion(cqv, tag(201), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(201), 1);
   cq_verify(cqv);
 
   op = ops;
@@ -362,8 +358,8 @@
   GPR_ASSERT(GRPC_CALL_OK ==
              grpc_call_start_batch(s2, ops, op - ops, tag(202)));
 
-  cq_expect_completion(cqv, tag(live_call + 2), GRPC_OP_OK);
-  cq_expect_completion(cqv, tag(202), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(live_call + 2), 1);
+  cq_expect_completion(cqv, tag(202), 1);
   cq_verify(cqv);
 
   cq_verifier_destroy(cqv);
diff --git a/test/core/end2end/tests/max_message_length.c b/test/core/end2end/tests/max_message_length.c
index d32930c..364d59e 100644
--- a/test/core/end2end/tests/max_message_length.c
+++ b/test/core/end2end/tests/max_message_length.c
@@ -66,14 +66,10 @@
 static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }
 
 static void drain_cq(grpc_completion_queue *cq) {
-  grpc_event *ev;
-  grpc_completion_type type;
+  grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, five_seconds_time());
-    GPR_ASSERT(ev);
-    type = ev->type;
-    grpc_event_finish(ev);
-  } while (type != GRPC_QUEUE_SHUTDOWN);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
 static void shutdown_server(grpc_end2end_test_fixture *f) {
@@ -162,7 +158,7 @@
              grpc_server_request_call(f.server, &s, &call_details,
                                       &request_metadata_recv, f.cq,
                                       f.cq, tag(101)));
-  cq_expect_completion(cqv, tag(101), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(101), 1);
   cq_verify(cqv);
 
   op = ops;
@@ -171,8 +167,8 @@
   op++;
   GPR_ASSERT(GRPC_CALL_OK == grpc_call_start_batch(s, ops, op - ops, tag(102)));
 
-  cq_expect_completion(cqv, tag(102), GRPC_OP_OK);
-  cq_expect_completion(cqv, tag(1), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(102), 1);
+  cq_expect_completion(cqv, tag(1), 1);
   cq_verify(cqv);
 
   GPR_ASSERT(status == GRPC_STATUS_CANCELLED);
diff --git a/test/core/end2end/tests/no_op.c b/test/core/end2end/tests/no_op.c
index b7cd2f1..979eb06 100644
--- a/test/core/end2end/tests/no_op.c
+++ b/test/core/end2end/tests/no_op.c
@@ -64,14 +64,10 @@
 static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }
 
 static void drain_cq(grpc_completion_queue *cq) {
-  grpc_event *ev;
-  grpc_completion_type type;
+  grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, five_seconds_time());
-    GPR_ASSERT(ev);
-    type = ev->type;
-    grpc_event_finish(ev);
-  } while (type != GRPC_QUEUE_SHUTDOWN);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
 static void shutdown_server(grpc_end2end_test_fixture *f) {
diff --git a/test/core/end2end/tests/ping_pong_streaming.c b/test/core/end2end/tests/ping_pong_streaming.c
index bc9a254..c00beb7 100644
--- a/test/core/end2end/tests/ping_pong_streaming.c
+++ b/test/core/end2end/tests/ping_pong_streaming.c
@@ -66,14 +66,10 @@
 static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }
 
 static void drain_cq(grpc_completion_queue *cq) {
-  grpc_event *ev;
-  grpc_completion_type type;
+  grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, five_seconds_time());
-    GPR_ASSERT(ev);
-    type = ev->type;
-    grpc_event_finish(ev);
-  } while (type != GRPC_QUEUE_SHUTDOWN);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
 static void shutdown_server(grpc_end2end_test_fixture *f) {
@@ -152,7 +148,7 @@
              grpc_server_request_call(f.server, &s, &call_details,
                                       &request_metadata_recv, f.cq,
                                       f.cq, tag(100)));
-  cq_expect_completion(cqv, tag(100), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(100), 1);
   cq_verify(cqv);
 
   op = ops;
@@ -183,7 +179,7 @@
     op++;
     GPR_ASSERT(GRPC_CALL_OK ==
                grpc_call_start_batch(s, ops, op - ops, tag(102)));
-    cq_expect_completion(cqv, tag(102), GRPC_OP_OK);
+    cq_expect_completion(cqv, tag(102), 1);
     cq_verify(cqv);
 
     op = ops;
@@ -192,8 +188,8 @@
     op++;
     GPR_ASSERT(GRPC_CALL_OK ==
                grpc_call_start_batch(s, ops, op - ops, tag(103)));
-    cq_expect_completion(cqv, tag(103), GRPC_OP_OK);
-    cq_expect_completion(cqv, tag(2), GRPC_OP_OK);
+    cq_expect_completion(cqv, tag(103), 1);
+    cq_expect_completion(cqv, tag(2), 1);
     cq_verify(cqv);
 
     grpc_byte_buffer_destroy(request_payload);
@@ -218,10 +214,10 @@
   op++;
   GPR_ASSERT(GRPC_CALL_OK == grpc_call_start_batch(s, ops, op - ops, tag(104)));
 
-  cq_expect_completion(cqv, tag(1), GRPC_OP_OK);
-  cq_expect_completion(cqv, tag(3), GRPC_OP_OK);
-  cq_expect_completion(cqv, tag(101), GRPC_OP_OK);
-  cq_expect_completion(cqv, tag(104), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(1), 1);
+  cq_expect_completion(cqv, tag(3), 1);
+  cq_expect_completion(cqv, tag(101), 1);
+  cq_expect_completion(cqv, tag(104), 1);
   cq_verify(cqv);
 
   grpc_call_destroy(c);
diff --git a/test/core/end2end/tests/registered_call.c b/test/core/end2end/tests/registered_call.c
index b2bae66..80f7d20 100644
--- a/test/core/end2end/tests/registered_call.c
+++ b/test/core/end2end/tests/registered_call.c
@@ -68,14 +68,10 @@
 static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }
 
 static void drain_cq(grpc_completion_queue *cq) {
-  grpc_event *ev;
-  grpc_completion_type type;
+  grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, five_seconds_time());
-    GPR_ASSERT(ev);
-    type = ev->type;
-    grpc_event_finish(ev);
-  } while (type != GRPC_QUEUE_SHUTDOWN);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
 static void shutdown_server(grpc_end2end_test_fixture *f) {
@@ -145,7 +141,7 @@
              grpc_server_request_call(f.server, &s, &call_details,
                                       &request_metadata_recv, f.cq,
                                       f.cq, tag(101)));
-  cq_expect_completion(cqv, tag(101), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(101), 1);
   cq_verify(cqv);
 
   op = ops;
@@ -162,8 +158,8 @@
   op++;
   GPR_ASSERT(GRPC_CALL_OK == grpc_call_start_batch(s, ops, op - ops, tag(102)));
 
-  cq_expect_completion(cqv, tag(102), GRPC_OP_OK);
-  cq_expect_completion(cqv, tag(1), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(102), 1);
+  cq_expect_completion(cqv, tag(1), 1);
   cq_verify(cqv);
 
   GPR_ASSERT(status == GRPC_STATUS_UNIMPLEMENTED);
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 58abf95..ce872a4 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
@@ -66,14 +66,10 @@
 static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }
 
 static void drain_cq(grpc_completion_queue *cq) {
-  grpc_event *ev;
-  grpc_completion_type type;
+  grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, five_seconds_time());
-    GPR_ASSERT(ev);
-    type = ev->type;
-    grpc_event_finish(ev);
-  } while (type != GRPC_QUEUE_SHUTDOWN);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
 static void shutdown_server(grpc_end2end_test_fixture *f) {
@@ -180,7 +176,7 @@
              grpc_server_request_call(f.server, &s, &call_details,
                                       &request_metadata_recv, f.cq,
                                       f.cq, tag(101)));
-  cq_expect_completion(cqv, tag(101), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(101), 1);
   cq_verify(cqv);
 
   op = ops;
@@ -204,8 +200,8 @@
   op++;
   GPR_ASSERT(GRPC_CALL_OK == grpc_call_start_batch(s, ops, op - ops, tag(102)));
 
-  cq_expect_completion(cqv, tag(102), GRPC_OP_OK);
-  cq_expect_completion(cqv, tag(1), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(102), 1);
+  cq_expect_completion(cqv, tag(1), 1);
   cq_verify(cqv);
 
   GPR_ASSERT(status == GRPC_STATUS_OK);
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 d5e5cb9..b4edb73 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
@@ -66,14 +66,10 @@
 static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }
 
 static void drain_cq(grpc_completion_queue *cq) {
-  grpc_event *ev;
-  grpc_completion_type type;
+  grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, five_seconds_time());
-    GPR_ASSERT(ev);
-    type = ev->type;
-    grpc_event_finish(ev);
-  } while (type != GRPC_QUEUE_SHUTDOWN);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
 static void shutdown_server(grpc_end2end_test_fixture *f) {
@@ -166,7 +162,7 @@
              grpc_server_request_call(f.server, &s, &call_details,
                                       &request_metadata_recv, f.cq,
                                       f.cq, tag(101)));
-  cq_expect_completion(cqv, tag(101), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(101), 1);
   cq_verify(cqv);
 
   op = ops;
@@ -190,8 +186,8 @@
   op++;
   GPR_ASSERT(GRPC_CALL_OK == grpc_call_start_batch(s, ops, op - ops, tag(102)));
 
-  cq_expect_completion(cqv, tag(102), GRPC_OP_OK);
-  cq_expect_completion(cqv, tag(1), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(102), 1);
+  cq_expect_completion(cqv, tag(1), 1);
   cq_verify(cqv);
 
   GPR_ASSERT(status == GRPC_STATUS_OK);
diff --git a/test/core/end2end/tests/request_response_with_payload.c b/test/core/end2end/tests/request_response_with_payload.c
index 558b2dd..cb50855 100644
--- a/test/core/end2end/tests/request_response_with_payload.c
+++ b/test/core/end2end/tests/request_response_with_payload.c
@@ -66,14 +66,10 @@
 static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }
 
 static void drain_cq(grpc_completion_queue *cq) {
-  grpc_event *ev;
-  grpc_completion_type type;
+  grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, five_seconds_time());
-    GPR_ASSERT(ev);
-    type = ev->type;
-    grpc_event_finish(ev);
-  } while (type != GRPC_QUEUE_SHUTDOWN);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
 static void shutdown_server(grpc_end2end_test_fixture *f) {
@@ -158,7 +154,7 @@
              grpc_server_request_call(f.server, &s, &call_details,
                                       &request_metadata_recv, f.cq,
                                       f.cq, tag(101)));
-  cq_expect_completion(cqv, tag(101), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(101), 1);
   cq_verify(cqv);
 
   op = ops;
@@ -181,8 +177,8 @@
   op++;
   GPR_ASSERT(GRPC_CALL_OK == grpc_call_start_batch(s, ops, op - ops, tag(102)));
 
-  cq_expect_completion(cqv, tag(102), GRPC_OP_OK);
-  cq_expect_completion(cqv, tag(1), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(102), 1);
+  cq_expect_completion(cqv, tag(1), 1);
   cq_verify(cqv);
 
   GPR_ASSERT(status == GRPC_STATUS_OK);
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 3759bd0..ec3f310 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
@@ -80,14 +80,10 @@
 static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }
 
 static void drain_cq(grpc_completion_queue *cq) {
-  grpc_event *ev;
-  grpc_completion_type type;
+  grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, five_seconds_time());
-    GPR_ASSERT(ev);
-    type = ev->type;
-    grpc_event_finish(ev);
-  } while (type != GRPC_QUEUE_SHUTDOWN);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
 static void shutdown_server(grpc_end2end_test_fixture *f) {
@@ -214,11 +210,11 @@
                                                       &request_metadata_recv,
                                                       f.cq, f.cq, 
                                                       tag(101)));
-  cq_expect_completion(cqv, tag(101), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(101), 1);
   cq_verify(cqv);
 
   /* Cannot set creds on the server call object. */
-  GPR_ASSERT(grpc_call_set_credentials(s, NULL) != GRPC_CALL_OK);
+  GPR_ASSERT(!grpc_call_set_credentials(s, NULL));
 
   op = ops;
   op->op = GRPC_OP_SEND_INITIAL_METADATA;
@@ -240,8 +236,8 @@
   op++;
   GPR_ASSERT(GRPC_CALL_OK == grpc_call_start_batch(s, ops, op - ops, tag(102)));
 
-  cq_expect_completion(cqv, tag(102), GRPC_OP_OK);
-  cq_expect_completion(cqv, tag(1), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(102), 1);
+  cq_expect_completion(cqv, tag(1), 1);
   cq_verify(cqv);
 
   GPR_ASSERT(status == GRPC_STATUS_OK);
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 9c0e1d2..1f1cb4c 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
@@ -66,14 +66,10 @@
 static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }
 
 static void drain_cq(grpc_completion_queue *cq) {
-  grpc_event *ev;
-  grpc_completion_type type;
+  grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, five_seconds_time());
-    GPR_ASSERT(ev);
-    type = ev->type;
-    grpc_event_finish(ev);
-  } while (type != GRPC_QUEUE_SHUTDOWN);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
 static void shutdown_server(grpc_end2end_test_fixture *f) {
@@ -168,9 +164,14 @@
   GPR_ASSERT(GRPC_CALL_OK == grpc_server_request_call(f.server, &s,
                                                       &call_details,
                                                       &request_metadata_recv,
+<<<<<<< HEAD
+                                                      f.server_cq, tag(101)));
+  cq_expect_completion(v_server, tag(101), 1);
+=======
                                                       f.server_cq, f.server_cq,
                                                       tag(101)));
   cq_expect_completion(v_server, tag(101), GRPC_OP_OK);
+>>>>>>> a468c36601dd5997580129bbd66b5ebed02521f8
   cq_verify(v_server);
 
   op = ops;
@@ -195,10 +196,10 @@
   op++;
   GPR_ASSERT(GRPC_CALL_OK == grpc_call_start_batch(s, ops, op - ops, tag(102)));
 
-  cq_expect_completion(v_server, tag(102), GRPC_OP_OK);
+  cq_expect_completion(v_server, tag(102), 1);
   cq_verify(v_server);
 
-  cq_expect_completion(v_client, tag(1), GRPC_OP_OK);
+  cq_expect_completion(v_client, tag(1), 1);
   cq_verify(v_client);
 
   GPR_ASSERT(status == GRPC_STATUS_OK);
diff --git a/test/core/end2end/tests/request_with_large_metadata.c b/test/core/end2end/tests/request_with_large_metadata.c
index 33228e1..a137786 100644
--- a/test/core/end2end/tests/request_with_large_metadata.c
+++ b/test/core/end2end/tests/request_with_large_metadata.c
@@ -66,14 +66,10 @@
 static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }
 
 static void drain_cq(grpc_completion_queue *cq) {
-  grpc_event *ev;
-  grpc_completion_type type;
+  grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, five_seconds_time());
-    GPR_ASSERT(ev);
-    type = ev->type;
-    grpc_event_finish(ev);
-  } while (type != GRPC_QUEUE_SHUTDOWN);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
 static void shutdown_server(grpc_end2end_test_fixture *f) {
@@ -162,7 +158,7 @@
              grpc_server_request_call(f.server, &s, &call_details,
                                       &request_metadata_recv, f.cq,
                                       f.cq, tag(101)));
-  cq_expect_completion(cqv, tag(101), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(101), 1);
   cq_verify(cqv);
 
   op = ops;
@@ -182,8 +178,8 @@
   op++;
   GPR_ASSERT(GRPC_CALL_OK == grpc_call_start_batch(s, ops, op - ops, tag(102)));
 
-  cq_expect_completion(cqv, tag(102), GRPC_OP_OK);
-  cq_expect_completion(cqv, tag(1), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(102), 1);
+  cq_expect_completion(cqv, tag(1), 1);
   cq_verify(cqv);
 
   GPR_ASSERT(status == GRPC_STATUS_OK);
diff --git a/test/core/end2end/tests/request_with_payload.c b/test/core/end2end/tests/request_with_payload.c
index 13e9d59..86199c9 100644
--- a/test/core/end2end/tests/request_with_payload.c
+++ b/test/core/end2end/tests/request_with_payload.c
@@ -66,14 +66,10 @@
 static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }
 
 static void drain_cq(grpc_completion_queue *cq) {
-  grpc_event *ev;
-  grpc_completion_type type;
+  grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, five_seconds_time());
-    GPR_ASSERT(ev);
-    type = ev->type;
-    grpc_event_finish(ev);
-  } while (type != GRPC_QUEUE_SHUTDOWN);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
 static void shutdown_server(grpc_end2end_test_fixture *f) {
@@ -153,7 +149,7 @@
              grpc_server_request_call(f.server, &s, &call_details,
                                       &request_metadata_recv, f.cq,
                                       f.cq, tag(101)));
-  cq_expect_completion(cqv, tag(101), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(101), 1);
   cq_verify(cqv);
 
   op = ops;
@@ -173,8 +169,8 @@
   op++;
   GPR_ASSERT(GRPC_CALL_OK == grpc_call_start_batch(s, ops, op - ops, tag(102)));
 
-  cq_expect_completion(cqv, tag(102), GRPC_OP_OK);
-  cq_expect_completion(cqv, tag(1), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(102), 1);
+  cq_expect_completion(cqv, tag(1), 1);
   cq_verify(cqv);
 
   GPR_ASSERT(status == GRPC_STATUS_OK);
diff --git a/test/core/end2end/tests/simple_delayed_request.c b/test/core/end2end/tests/simple_delayed_request.c
index 289acae..c51019c 100644
--- a/test/core/end2end/tests/simple_delayed_request.c
+++ b/test/core/end2end/tests/simple_delayed_request.c
@@ -54,14 +54,10 @@
 static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }
 
 static void drain_cq(grpc_completion_queue *cq) {
-  grpc_event *ev;
-  grpc_completion_type type;
+  grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, five_seconds_time());
-    GPR_ASSERT(ev);
-    type = ev->type;
-    grpc_event_finish(ev);
-  } while (type != GRPC_QUEUE_SHUTDOWN);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
 static void shutdown_server(grpc_end2end_test_fixture *f) {
@@ -140,7 +136,7 @@
              grpc_server_request_call(f->server, &s, &call_details,
                                       &request_metadata_recv, f->cq,
                                       f->cq, tag(101)));
-  cq_expect_completion(cqv, tag(101), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(101), 1);
   cq_verify(cqv);
 
   op = ops;
@@ -157,8 +153,8 @@
   op++;
   GPR_ASSERT(GRPC_CALL_OK == grpc_call_start_batch(s, ops, op - ops, tag(102)));
 
-  cq_expect_completion(cqv, tag(102), GRPC_OP_OK);
-  cq_expect_completion(cqv, tag(1), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(102), 1);
+  cq_expect_completion(cqv, tag(1), 1);
   cq_verify(cqv);
 
   GPR_ASSERT(status == GRPC_STATUS_UNIMPLEMENTED);
diff --git a/test/core/end2end/tests/simple_request.c b/test/core/end2end/tests/simple_request.c
index 8dd5a2b..be9e414 100644
--- a/test/core/end2end/tests/simple_request.c
+++ b/test/core/end2end/tests/simple_request.c
@@ -68,14 +68,10 @@
 static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }
 
 static void drain_cq(grpc_completion_queue *cq) {
-  grpc_event *ev;
-  grpc_completion_type type;
+  grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, five_seconds_time());
-    GPR_ASSERT(ev);
-    type = ev->type;
-    grpc_event_finish(ev);
-  } while (type != GRPC_QUEUE_SHUTDOWN);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
 static void shutdown_server(grpc_end2end_test_fixture *f) {
@@ -146,7 +142,7 @@
              grpc_server_request_call(f.server, &s, &call_details,
                                       &request_metadata_recv, f.cq,
                                       f.cq, tag(101)));
-  cq_expect_completion(cqv, tag(101), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(101), 1);
   cq_verify(cqv);
 
   op = ops;
@@ -163,8 +159,8 @@
   op++;
   GPR_ASSERT(GRPC_CALL_OK == grpc_call_start_batch(s, ops, op - ops, tag(102)));
 
-  cq_expect_completion(cqv, tag(102), GRPC_OP_OK);
-  cq_expect_completion(cqv, tag(1), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(102), 1);
+  cq_expect_completion(cqv, tag(1), 1);
   cq_verify(cqv);
 
   GPR_ASSERT(status == GRPC_STATUS_UNIMPLEMENTED);
diff --git a/test/core/end2end/tests/simple_request_with_high_initial_sequence_number.c b/test/core/end2end/tests/simple_request_with_high_initial_sequence_number.c
index 241da3f..566f971 100644
--- a/test/core/end2end/tests/simple_request_with_high_initial_sequence_number.c
+++ b/test/core/end2end/tests/simple_request_with_high_initial_sequence_number.c
@@ -68,14 +68,10 @@
 static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }
 
 static void drain_cq(grpc_completion_queue *cq) {
-  grpc_event *ev;
-  grpc_completion_type type;
+  grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, five_seconds_time());
-    GPR_ASSERT(ev);
-    type = ev->type;
-    grpc_event_finish(ev);
-  } while (type != GRPC_QUEUE_SHUTDOWN);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }
 
 static void shutdown_server(grpc_end2end_test_fixture *f) {
@@ -146,7 +142,7 @@
              grpc_server_request_call(f.server, &s, &call_details,
                                       &request_metadata_recv, f.cq,
                                       f.cq, tag(101)));
-  cq_expect_completion(cqv, tag(101), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(101), 1);
   cq_verify(cqv);
 
   op = ops;
@@ -163,8 +159,8 @@
   op++;
   GPR_ASSERT(GRPC_CALL_OK == grpc_call_start_batch(s, ops, op - ops, tag(102)));
 
-  cq_expect_completion(cqv, tag(102), GRPC_OP_OK);
-  cq_expect_completion(cqv, tag(1), GRPC_OP_OK);
+  cq_expect_completion(cqv, tag(102), 1);
+  cq_expect_completion(cqv, tag(1), 1);
   cq_verify(cqv);
 
   GPR_ASSERT(status == GRPC_STATUS_UNIMPLEMENTED);