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/*
* libmowgli: A collection of useful routines for programming.
* mutex.c: Cross-platform mutexes.
*
* Copyright (c) 2011 William Pitcock <nenolod@dereferenced.org>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice is present in all copies.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 "mowgli.h"
#if defined(_WIN32)
extern const mowgli_mutex_ops_t _mowgli_win32_mutex_ops;
#elif defined(_sun) || defined(_sco)
extern const mowgli_mutex_ops_t _mowgli_sun_mutex_ops;
#else
extern const mowgli_mutex_ops_t _mowgli_posix_mutex_ops;
#endif
extern const mowgli_mutex_ops_t _mowgli_null_mutex_ops;
static const mowgli_mutex_ops_t *_mowgli_mutex_ops = NULL;
static inline const mowgli_mutex_ops_t *get_mutex_platform(void)
{
/* allow for threading policy to set custom mutex ops */
if (_mowgli_mutex_ops != NULL)
return _mowgli_mutex_ops;
#if defined(_WIN32)
return &_mowgli_win32_mutex_ops;
#endif
#if defined(_sun) || defined(_sco)
return &_mowgli_sun_mutex_ops;
#endif
#if !defined(MOWGLI_FEATURE_HAVE_NATIVE_MUTEXES)
return &_mowgli_posix_mutex_ops;
#endif
return &_mowgli_null_mutex_ops;
}
mowgli_mutex_t *mowgli_mutex_create(void)
{
mowgli_mutex_t *mutex = mowgli_alloc(sizeof(mowgli_mutex_t));
return_val_if_fail(mutex != NULL, NULL);
if (mowgli_mutex_init(mutex))
return mutex;
else
{
mowgli_free(mutex);
return NULL;
}
}
int mowgli_mutex_init(mowgli_mutex_t *mutex)
{
return_val_if_fail(mutex != NULL, -1);
mutex->ops = get_mutex_platform();
return mutex->ops->mutex_create(mutex);
}
int mowgli_mutex_lock(mowgli_mutex_t *mutex)
{
return_val_if_fail(mutex != NULL, -1);
return_val_if_fail(mutex->ops != NULL, -1);
return mutex->ops->mutex_lock(mutex);
}
int mowgli_mutex_trylock(mowgli_mutex_t *mutex)
{
return_val_if_fail(mutex != NULL, -1);
return_val_if_fail(mutex->ops != NULL, -1);
return mutex->ops->mutex_trylock(mutex);
}
int mowgli_mutex_unlock(mowgli_mutex_t *mutex)
{
return_val_if_fail(mutex != NULL, -1);
return_val_if_fail(mutex->ops != NULL, -1);
return mutex->ops->mutex_unlock(mutex);
}
int mowgli_mutex_uninit(mowgli_mutex_t *mutex)
{
return_val_if_fail(mutex != NULL, -1);
return_val_if_fail(mutex->ops != NULL, -1);
return mutex->ops->mutex_destroy(mutex);
}
void mowgli_mutex_destroy(mowgli_mutex_t *mutex)
{
return_if_fail(mutex != NULL);
mowgli_mutex_uninit(mutex);
mowgli_free(mutex);
}
void mowgli_mutex_set_policy(mowgli_thread_policy_t policy)
{
switch (policy)
{
case MOWGLI_THREAD_POLICY_DISABLED:
_mowgli_mutex_ops = &_mowgli_null_mutex_ops;
break;
case MOWGLI_THREAD_POLICY_DEFAULT:
default:
_mowgli_mutex_ops = NULL;
}
}
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