| /* |
| * |
| * Copyright 2014, 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. |
| * |
| */ |
| |
| #include "rb_completion_queue.h" |
| |
| #include <ruby.h> |
| |
| #include <grpc/grpc.h> |
| #include <grpc/support/time.h> |
| #include "rb_grpc.h" |
| #include "rb_event.h" |
| |
| /* Used to allow grpc_completion_queue_next call to release the GIL */ |
| typedef struct next_call_stack { |
| grpc_completion_queue *cq; |
| grpc_event *event; |
| gpr_timespec timeout; |
| void *tag; |
| } next_call_stack; |
| |
| /* Calls grpc_completion_queue_next without holding the ruby GIL */ |
| static void *grpc_rb_completion_queue_next_no_gil(next_call_stack *next_call) { |
| next_call->event = |
| grpc_completion_queue_next(next_call->cq, next_call->timeout); |
| return NULL; |
| } |
| |
| /* Calls grpc_completion_queue_pluck without holding the ruby GIL */ |
| static void *grpc_rb_completion_queue_pluck_no_gil(next_call_stack *next_call) { |
| next_call->event = grpc_completion_queue_pluck(next_call->cq, next_call->tag, |
| next_call->timeout); |
| return NULL; |
| } |
| |
| /* Shuts down and drains the completion queue if necessary. |
| * |
| * This is done when the ruby completion queue object is about to be GCed. |
| */ |
| static void grpc_rb_completion_queue_shutdown_drain(grpc_completion_queue *cq) { |
| next_call_stack next_call; |
| grpc_completion_type type; |
| int drained = 0; |
| MEMZERO(&next_call, next_call_stack, 1); |
| |
| grpc_completion_queue_shutdown(cq); |
| next_call.cq = cq; |
| next_call.event = NULL; |
| /* TODO: the timeout should be a module level constant that defaults |
| * to gpr_inf_future. |
| * |
| * - at the moment this does not work, it stalls. Using a small timeout like |
| * this one works, and leads to fast test run times; a longer timeout was |
| * causing unnecessary delays in the test runs. |
| * |
| * - investigate further, this is probably another example of C-level cleanup |
| * not working consistently in all cases. |
| */ |
| next_call.timeout = gpr_time_add(gpr_now(), gpr_time_from_micros(5e3)); |
| do { |
| rb_thread_call_without_gvl(grpc_rb_completion_queue_next_no_gil, |
| (void *)&next_call, NULL, NULL); |
| if (next_call.event == NULL) { |
| break; |
| } |
| type = next_call.event->type; |
| if (type != GRPC_QUEUE_SHUTDOWN) { |
| ++drained; |
| rb_warning("completion queue shutdown: %d undrained events", drained); |
| } |
| grpc_event_finish(next_call.event); |
| next_call.event = NULL; |
| } while (type != GRPC_QUEUE_SHUTDOWN); |
| } |
| |
| /* Helper function to free a completion queue. */ |
| static void grpc_rb_completion_queue_destroy(void *p) { |
| grpc_completion_queue *cq = NULL; |
| if (p == NULL) { |
| return; |
| } |
| cq = (grpc_completion_queue *)p; |
| grpc_rb_completion_queue_shutdown_drain(cq); |
| grpc_completion_queue_destroy(cq); |
| } |
| |
| /* Allocates a completion queue. */ |
| static VALUE grpc_rb_completion_queue_alloc(VALUE cls) { |
| grpc_completion_queue *cq = grpc_completion_queue_create(); |
| if (cq == NULL) { |
| rb_raise(rb_eArgError, "could not create a completion queue: not sure why"); |
| } |
| return Data_Wrap_Struct(cls, GC_NOT_MARKED, grpc_rb_completion_queue_destroy, |
| cq); |
| } |
| |
| /* Blocks until the next event is available, and returns the event. */ |
| static VALUE grpc_rb_completion_queue_next(VALUE self, VALUE timeout) { |
| next_call_stack next_call; |
| MEMZERO(&next_call, next_call_stack, 1); |
| Data_Get_Struct(self, grpc_completion_queue, next_call.cq); |
| next_call.timeout = grpc_rb_time_timeval(timeout, /* absolute time*/ 0); |
| next_call.event = NULL; |
| rb_thread_call_without_gvl(grpc_rb_completion_queue_next_no_gil, |
| (void *)&next_call, NULL, NULL); |
| if (next_call.event == NULL) { |
| return Qnil; |
| } |
| return grpc_rb_new_event(next_call.event); |
| } |
| |
| /* Blocks until the next event for given tag is available, and returns the |
| * event. */ |
| static VALUE grpc_rb_completion_queue_pluck(VALUE self, VALUE tag, |
| VALUE timeout) { |
| next_call_stack next_call; |
| MEMZERO(&next_call, next_call_stack, 1); |
| Data_Get_Struct(self, grpc_completion_queue, next_call.cq); |
| next_call.timeout = grpc_rb_time_timeval(timeout, /* absolute time*/ 0); |
| next_call.tag = ROBJECT(tag); |
| next_call.event = NULL; |
| rb_thread_call_without_gvl(grpc_rb_completion_queue_pluck_no_gil, |
| (void *)&next_call, NULL, NULL); |
| if (next_call.event == NULL) { |
| return Qnil; |
| } |
| return grpc_rb_new_event(next_call.event); |
| } |
| |
| /* rb_cCompletionQueue is the ruby class that proxies grpc_completion_queue. */ |
| VALUE rb_cCompletionQueue = Qnil; |
| |
| void Init_grpc_completion_queue() { |
| rb_cCompletionQueue = |
| rb_define_class_under(rb_mGrpcCore, "CompletionQueue", rb_cObject); |
| |
| /* constructor: uses an alloc func without an initializer. Using a simple |
| alloc func works here as the grpc header does not specify any args for |
| this func, so no separate initialization step is necessary. */ |
| rb_define_alloc_func(rb_cCompletionQueue, grpc_rb_completion_queue_alloc); |
| |
| /* Add the next method that waits for the next event. */ |
| rb_define_method(rb_cCompletionQueue, "next", grpc_rb_completion_queue_next, |
| 1); |
| |
| /* Add the pluck method that waits for the next event of given tag */ |
| rb_define_method(rb_cCompletionQueue, "pluck", grpc_rb_completion_queue_pluck, |
| 2); |
| } |
| |
| /* Gets the wrapped completion queue from the ruby wrapper */ |
| grpc_completion_queue *grpc_rb_get_wrapped_completion_queue(VALUE v) { |
| grpc_completion_queue *cq = NULL; |
| Data_Get_Struct(v, grpc_completion_queue, cq); |
| return cq; |
| } |