/*
* Copyright (C) 2001-2004 Jakub Jermar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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.
*/
/**
* @file mutex.c
* @brief Mutexes.
*/
#include <synch/mutex.h>
#include <synch/semaphore.h>
#include <synch/synch.h>
/** Initialize mutex
*
* Initialize mutex.
*
* @param mtx Mutex.
*/
void mutex_initialize(mutex_t *mtx)
{
semaphore_initialize(&mtx->sem, 1);
}
/** Acquire mutex
*
* Acquire mutex.
* Timeout mode and non-blocking mode can be requested.
*
* @param mtx Mutex.
* @param usec Timeout in microseconds.
* @param flags Specify mode of operation.
*
* For exact description of possible combinations of
* usec and flags, see comment for waitq_sleep_timeout().
*
* @return See comment for waitq_sleep_timeout().
*/
int _mutex_lock_timeout(mutex_t *mtx, __u32 usec, int flags)
{
return _semaphore_down_timeout(&mtx->sem, usec, flags);
}
/** Release mutex
*
* Release mutex.
*
* @param mtx Mutex.
*/
void mutex_unlock(mutex_t *mtx)
{
semaphore_up(&mtx->sem);
}