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/*
*
* Copyright 2016 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#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_queue.abort) {
if ((event = grpc_rb_event_queue_dequeue()) != NULL) {
gpr_mu_unlock(&event_queue.mu);
return event;
}
gpr_cv_wait(&event_queue.cv, &event_queue.mu,
gpr_inf_future(GPR_CLOCK_REALTIME));
}
gpr_mu_unlock(&event_queue.mu);
return NULL;
}
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);
}
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