RIOT/sys/posix/pthread/pthread_mutex.c

/*
 * Copyright (C) 2013 Freie Universität Berlin
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */

/**
 * @ingroup pthread
 * @{
 * @file
 * @brief   Mutual exclusion.
 * @author  Christian Mehlis <mehlis@inf.fu-berlin.de>
 * @author  René Kijewski <kijewski@inf.fu-berlin.de>
 * @}
 */

#include <string.h>
#include <stddef.h>

#include "pthread.h"

int pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *mutexattr)
{
    (void) mutexattr;

    if (!mutex) {
        return -1;
    }

    mutex_init(mutex);
    return 0;
}

int pthread_mutex_destroy(pthread_mutex_t *mutex)
{
    (void) mutex;
    return 0;
}

int pthread_mutex_trylock(pthread_mutex_t *mutex)
{
    if (!mutex) {
        return -1;
    }

    /* mutex_trylock() returns 1 on success, and 0 otherwise. */
    /* We want the reverse. */
    return 1 - mutex_trylock(mutex);
}

int pthread_mutex_lock(pthread_mutex_t *mutex)
{
    if (!mutex) {
        return -1;
    }

    mutex_lock(mutex);
    return 0;
}

int pthread_mutex_timedlock(pthread_mutex_t *mutex, const struct timespec *abstime)
{
    (void) mutex;
    (void) abstime;
    return -1; /* currently not supported */
}

int pthread_mutex_unlock(pthread_mutex_t *mutex)
{
    if (!mutex) {
        return -1;
    }

    mutex_unlock(mutex);
    return 0;
}