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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 <stdio.h>
#include <stdlib.h>
static uv_cond_t condvar;
static uv_mutex_t mutex;
static uv_rwlock_t rwlock;
static int step;
/* The mutex and rwlock tests are really poor.
* They're very basic sanity checks and nothing more.
* Apologies if that rhymes.
*/
TEST_IMPL(thread_mutex) {
uv_mutex_t mutex;
int r;
r = uv_mutex_init(&mutex);
ASSERT(r == 0);
uv_mutex_lock(&mutex);
uv_mutex_unlock(&mutex);
uv_mutex_destroy(&mutex);
return 0;
}
TEST_IMPL(thread_rwlock) {
uv_rwlock_t rwlock;
int r;
r = uv_rwlock_init(&rwlock);
ASSERT(r == 0);
uv_rwlock_rdlock(&rwlock);
uv_rwlock_rdunlock(&rwlock);
uv_rwlock_wrlock(&rwlock);
uv_rwlock_wrunlock(&rwlock);
uv_rwlock_destroy(&rwlock);
return 0;
}
/* Call when holding |mutex|. */
static void synchronize_nowait(void) {
step += 1;
uv_cond_signal(&condvar);
}
/* Call when holding |mutex|. */
static void synchronize(void) {
int current;
synchronize_nowait();
/* Wait for the other thread. Guard against spurious wakeups. */
for (current = step; current == step; uv_cond_wait(&condvar, &mutex));
ASSERT(step == current + 1);
}
static void thread_rwlock_trylock_peer(void* unused) {
(void) &unused;
uv_mutex_lock(&mutex);
/* Write lock held by other thread. */
ASSERT(UV_EBUSY == uv_rwlock_tryrdlock(&rwlock));
ASSERT(UV_EBUSY == uv_rwlock_trywrlock(&rwlock));
synchronize();
/* Read lock held by other thread. */
ASSERT(0 == uv_rwlock_tryrdlock(&rwlock));
uv_rwlock_rdunlock(&rwlock);
ASSERT(UV_EBUSY == uv_rwlock_trywrlock(&rwlock));
synchronize();
/* Acquire write lock. */
ASSERT(0 == uv_rwlock_trywrlock(&rwlock));
synchronize();
/* Release write lock and acquire read lock. */
uv_rwlock_wrunlock(&rwlock);
ASSERT(0 == uv_rwlock_tryrdlock(&rwlock));
synchronize();
uv_rwlock_rdunlock(&rwlock);
synchronize_nowait(); /* Signal main thread we're going away. */
uv_mutex_unlock(&mutex);
}
TEST_IMPL(thread_rwlock_trylock) {
uv_thread_t thread;
ASSERT(0 == uv_cond_init(&condvar));
ASSERT(0 == uv_mutex_init(&mutex));
ASSERT(0 == uv_rwlock_init(&rwlock));
uv_mutex_lock(&mutex);
ASSERT(0 == uv_thread_create(&thread, thread_rwlock_trylock_peer, NULL));
/* Hold write lock. */
ASSERT(0 == uv_rwlock_trywrlock(&rwlock));
synchronize(); /* Releases the mutex to the other thread. */
/* Release write lock and acquire read lock. Pthreads doesn't support
* the notion of upgrading or downgrading rwlocks, so neither do we.
*/
uv_rwlock_wrunlock(&rwlock);
ASSERT(0 == uv_rwlock_tryrdlock(&rwlock));
synchronize();
/* Release read lock. */
uv_rwlock_rdunlock(&rwlock);
synchronize();
/* Write lock held by other thread. */
ASSERT(UV_EBUSY == uv_rwlock_tryrdlock(&rwlock));
ASSERT(UV_EBUSY == uv_rwlock_trywrlock(&rwlock));
synchronize();
/* Read lock held by other thread. */
ASSERT(0 == uv_rwlock_tryrdlock(&rwlock));
uv_rwlock_rdunlock(&rwlock);
ASSERT(UV_EBUSY == uv_rwlock_trywrlock(&rwlock));
synchronize();
ASSERT(0 == uv_thread_join(&thread));
uv_rwlock_destroy(&rwlock);
uv_mutex_unlock(&mutex);
uv_mutex_destroy(&mutex);
uv_cond_destroy(&condvar);
return 0;
}
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