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/*
* The MIT License (MIT)
*
* Copyright © 2015-2016 Franklin "Snaipe" Mathieu <http://snai.pe/>
*
* 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 <errno.h>
#include "mutex.h"
#ifdef HAVE_WIN32_SYNCHAPI
# include <synchapi.h>
#endif
#ifdef HAVE_WIN32_THREADS
BOOL CALLBACK init_once(PINIT_ONCE once, PVOID param, PVOID *ctx)
{
(void) once;
(void) ctx;
return !cri_mutex_init(param);
}
#endif
int cri_mutex_init_once(struct cri_mutex *mutex)
{
#ifdef HAVE_WIN32_THREADS
static INIT_ONCE once;
BOOL rc = InitOnceExecuteOnce(&once, init_once, mutex, NULL);
return rc ? 0 : -EINVAL;
#elif HAVE_PTHREADS
static pthread_mutex_t once = PTHREAD_MUTEX_INITIALIZER;
int rc = -pthread_mutex_lock(&once);
if (rc)
return rc;
if (mutex->init)
goto end;
rc = cri_mutex_init(mutex);
end:
pthread_mutex_unlock(&once);
return rc;
#else
return -ENOTSUP;
#endif
}
int cri_mutex_init(struct cri_mutex *mutex)
{
#ifdef HAVE_WIN32_THREADS
InitializeCriticalSection(&mutex->mutex);
return 0;
#elif HAVE_PTHREADS
int rc = pthread_mutex_init(&mutex->mutex, NULL);
if (!rc)
mutex->init = 1;
return -rc;
#else
return -ENOTSUP;
#endif
}
int cri_mutex_lock(struct cri_mutex *mutex)
{
#ifdef HAVE_WIN32_THREADS
EnterCriticalSection(&mutex->mutex);
return 0;
#elif HAVE_PTHREADS
return -pthread_mutex_lock(&mutex->mutex);
#else
return -ENOTSUP;
#endif
}
int cri_mutex_unlock(struct cri_mutex *mutex)
{
#ifdef HAVE_WIN32_THREADS
LeaveCriticalSection(&mutex->mutex);
return 0;
#elif HAVE_PTHREADS
return -pthread_mutex_unlock(&mutex->mutex);
#else
return -ENOTSUP;
#endif
}
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