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/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "uv.h"
#include "task.h"
#include <stdlib.h>
#include <string.h>
typedef struct {
uv_mutex_t mutex;
uv_sem_t sem;
int delay;
volatile int posted;
} worker_config;
static void worker(void* arg) {
worker_config* c = arg;
if (c->delay)
uv_sleep(c->delay);
uv_mutex_lock(&c->mutex);
ASSERT(c->posted == 0);
uv_sem_post(&c->sem);
c->posted = 1;
uv_mutex_unlock(&c->mutex);
}
TEST_IMPL(semaphore_1) {
uv_thread_t thread;
worker_config wc;
memset(&wc, 0, sizeof(wc));
ASSERT(0 == uv_sem_init(&wc.sem, 0));
ASSERT(0 == uv_mutex_init(&wc.mutex));
ASSERT(0 == uv_thread_create(&thread, worker, &wc));
uv_sleep(100);
uv_mutex_lock(&wc.mutex);
ASSERT(wc.posted == 1);
uv_sem_wait(&wc.sem); /* should not block */
uv_mutex_unlock(&wc.mutex); /* ergo, it should be ok to unlock after wait */
ASSERT(0 == uv_thread_join(&thread));
uv_mutex_destroy(&wc.mutex);
uv_sem_destroy(&wc.sem);
return 0;
}
TEST_IMPL(semaphore_2) {
uv_thread_t thread;
worker_config wc;
memset(&wc, 0, sizeof(wc));
wc.delay = 100;
ASSERT(0 == uv_sem_init(&wc.sem, 0));
ASSERT(0 == uv_mutex_init(&wc.mutex));
ASSERT(0 == uv_thread_create(&thread, worker, &wc));
uv_sem_wait(&wc.sem);
ASSERT(0 == uv_thread_join(&thread));
uv_mutex_destroy(&wc.mutex);
uv_sem_destroy(&wc.sem);
return 0;
}
TEST_IMPL(semaphore_3) {
uv_sem_t sem;
ASSERT(0 == uv_sem_init(&sem, 3));
uv_sem_wait(&sem); /* should not block */
uv_sem_wait(&sem); /* should not block */
ASSERT(0 == uv_sem_trywait(&sem));
ASSERT(UV_EAGAIN == uv_sem_trywait(&sem));
uv_sem_post(&sem);
ASSERT(0 == uv_sem_trywait(&sem));
ASSERT(UV_EAGAIN == uv_sem_trywait(&sem));
uv_sem_destroy(&sem);
return 0;
}
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