| /* |
| * |
| * Copyright 2016, 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 <ruby/ruby.h> |
| |
| #include "rb_event_thread.h" |
| #include "rb_grpc_imports.generated.h" |
| |
| #include <stdbool.h> |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/sync.h> |
| #include <grpc/support/time.h> |
| #include <ruby/thread.h> |
| |
| typedef struct grpc_rb_event { |
| // callback will be called with argument while holding the GVL |
| void (*callback)(void *); |
| void *argument; |
| |
| struct grpc_rb_event *next; |
| } grpc_rb_event; |
| |
| typedef struct grpc_rb_event_queue { |
| grpc_rb_event *head; |
| grpc_rb_event *tail; |
| |
| gpr_mu mu; |
| gpr_cv cv; |
| |
| // Indicates that the thread should stop waiting |
| bool abort; |
| } grpc_rb_event_queue; |
| |
| static grpc_rb_event_queue event_queue; |
| |
| void grpc_rb_event_queue_enqueue(void (*callback)(void *), void *argument) { |
| grpc_rb_event *event = gpr_malloc(sizeof(grpc_rb_event)); |
| event->callback = callback; |
| event->argument = argument; |
| event->next = NULL; |
| gpr_mu_lock(&event_queue.mu); |
| if (event_queue.tail == NULL) { |
| event_queue.head = event_queue.tail = event; |
| } else { |
| event_queue.tail->next = event; |
| event_queue.tail = event; |
| } |
| gpr_cv_signal(&event_queue.cv); |
| gpr_mu_unlock(&event_queue.mu); |
| } |
| |
| static grpc_rb_event *grpc_rb_event_queue_dequeue() { |
| grpc_rb_event *event; |
| if (event_queue.head == NULL) { |
| event = NULL; |
| } else { |
| event = event_queue.head; |
| if (event_queue.head->next == NULL) { |
| event_queue.head = event_queue.tail = NULL; |
| } else { |
| event_queue.head = event_queue.head->next; |
| } |
| } |
| return event; |
| } |
| |
| static void grpc_rb_event_queue_destroy() { |
| gpr_mu_destroy(&event_queue.mu); |
| gpr_cv_destroy(&event_queue.cv); |
| } |
| |
| static void *grpc_rb_wait_for_event_no_gil(void *param) { |
| grpc_rb_event *event = NULL; |
| (void)param; |
| gpr_mu_lock(&event_queue.mu); |
| while ((event = grpc_rb_event_queue_dequeue()) == NULL) { |
| gpr_cv_wait(&event_queue.cv, &event_queue.mu, |
| gpr_inf_future(GPR_CLOCK_REALTIME)); |
| if (event_queue.abort) { |
| gpr_mu_unlock(&event_queue.mu); |
| return NULL; |
| } |
| } |
| gpr_mu_unlock(&event_queue.mu); |
| return event; |
| } |
| |
| static void grpc_rb_event_unblocking_func(void *arg) { |
| (void)arg; |
| gpr_mu_lock(&event_queue.mu); |
| event_queue.abort = true; |
| gpr_cv_signal(&event_queue.cv); |
| gpr_mu_unlock(&event_queue.mu); |
| } |
| |
| /* This is the implementation of the thread that handles auth metadata plugin |
| * events */ |
| static VALUE grpc_rb_event_thread(VALUE arg) { |
| grpc_rb_event *event; |
| (void)arg; |
| while (true) { |
| event = (grpc_rb_event *)rb_thread_call_without_gvl( |
| grpc_rb_wait_for_event_no_gil, NULL, grpc_rb_event_unblocking_func, |
| NULL); |
| if (event == NULL) { |
| // Indicates that the thread needs to shut down |
| break; |
| } else { |
| event->callback(event->argument); |
| gpr_free(event); |
| } |
| } |
| grpc_rb_event_queue_destroy(); |
| return Qnil; |
| } |
| |
| void grpc_rb_event_queue_thread_start() { |
| event_queue.head = event_queue.tail = NULL; |
| event_queue.abort = false; |
| gpr_mu_init(&event_queue.mu); |
| gpr_cv_init(&event_queue.cv); |
| |
| rb_thread_create(grpc_rb_event_thread, NULL); |
| } |