mutex.c

/*
 * Copyright (c) 2017, George Oikonomou - http://www.spd.gr
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. Neither the name of the copyright holder nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``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
 * COPYRIGHT HOLDER OR CONTRIBUTORS 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.
 */
/*---------------------------------------------------------------------------*/
/**
 * \addtogroup mutex
 * @{
 */
/*---------------------------------------------------------------------------*/
#include "contiki.h"
#include "sys/mutex.h"
#include "sys/critical.h"
 
#include <stdint.h>
#include <stdbool.h>
/*---------------------------------------------------------------------------*/
bool
mutex_generic_try_lock(volatile mutex_t *mutex)
{
  bool success = false;
  int_master_status_t status = critical_enter();
 
  if(*mutex == MUTEX_STATUS_UNLOCKED) {
    *mutex = MUTEX_STATUS_LOCKED;
    success = true;
  }
 
  critical_exit(status);
 
  return success;
}
/*---------------------------------------------------------------------------*/
void
mutex_generic_unlock(volatile mutex_t *mutex)
{
  int_master_status_t status = critical_enter();
 
  *mutex = MUTEX_STATUS_UNLOCKED;
 
  critical_exit(status);
}
/*---------------------------------------------------------------------------*/
/** @} */