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/*
* The MIT License
*
* Copyright (C) 2016 Alexander Saprykin <saprykin.spb@gmail.com>
*
* 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 "pmem.h"
#include "pmutex.h"
#include <stdlib.h>
#include <errno.h>
#include <atheos/semaphore.h>
typedef sem_id mutex_hdl;
struct PMutex_ {
mutex_hdl hdl;
};
P_LIB_API PMutex *
p_mutex_new (void)
{
PMutex *ret;
if (P_UNLIKELY ((ret = p_malloc0 (sizeof (PMutex))) == NULL)) {
P_ERROR ("PMutex::p_mutex_new: failed to allocate memory");
return NULL;
}
if (P_UNLIKELY ((ret->hdl = create_semaphore ("", 1, 0)) < 0)) {
P_ERROR ("PMutex::p_mutex_new: create_semaphore() failed");
p_free (ret);
return NULL;
}
return ret;
}
P_LIB_API pboolean
p_mutex_lock (PMutex *mutex)
{
status_t ret_status;
if (P_UNLIKELY (mutex == NULL))
return FALSE;
while ((ret_status = lock_semaphore (mutex->hdl)) == EINTR)
;
if (P_LIKELY (ret_status == 0))
return TRUE;
else {
P_ERROR ("PMutex::p_mutex_lock: lock_semaphore() failed");
return FALSE;
}
}
P_LIB_API pboolean
p_mutex_trylock (PMutex *mutex)
{
if (P_UNLIKELY (mutex == NULL))
return FALSE;
return (lock_semaphore_x (mutex->hdl, 1, 0, 0)) == 0 ? TRUE : FALSE;
}
P_LIB_API pboolean
p_mutex_unlock (PMutex *mutex)
{
if (P_UNLIKELY (mutex == NULL))
return FALSE;
if (P_LIKELY (unlock_semaphore (mutex->hdl) == 0))
return TRUE;
else {
P_ERROR ("PMutex::p_mutex_unlock: unlock_semaphore() failed");
return FALSE;
}
}
P_LIB_API void
p_mutex_free (PMutex *mutex)
{
if (P_UNLIKELY (mutex == NULL))
return;
if (P_UNLIKELY (delete_semaphore (mutex->hdl) != 0))
P_ERROR ("PMutex::p_mutex_free: delete_semaphore() failed");
p_free (mutex);
}
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