SAMutex.c

/* Copyright (C) 2011 by Chenguang Wang(wecing)
 *
 * This program is free software. It comes without any warranty, to
 * the extent permitted by applicable law. You can redistribute it
 * and/or modify it under the terms of the Do What The Fuck You Want
 * To Public License, Version 2, as published by Sam Hocevar. See
 * http://sam.zoy.org/wtfpl/COPYING for more details.
 */

#ifdef __cplusplus
extern "C" {
#endif

#include "SimpleAV.h"

/*
 * A simple cross-platform(sorry, *BSD...) mutex.
 *
 * usage:
 * SAMutex mutex;
 * SAMutex_init(&mutex);
 * SAMutex_lock(&mutex);
 * SAMutex_unlock(&mutex);
 * SAMutex_destroy(&mutex);
 *
 * all functions return 0 on success, -1 on error.
*/

int SAMutex_init(SAMutex *mutex)
{
     if(mutex == NULL)
          return -1;
#if defined(__unix__) || defined(__MACH__)
     return pthread_mutex_init(mutex, NULL) == 0 ? 0 : -1;
#elif defined(_WIN32)
     *mutex = CreateMutex(0, FALSE, 0);
     return *mutex == NULL ? -1 : 0;
#endif
     return -1;
}

int SAMutex_lock(SAMutex *mutex)
{
     if(mutex == NULL)
          return -1;
#if defined(__unix__) || defined(__MACH__)
     return pthread_mutex_lock(mutex) == 0 ? 0 : -1;
#elif defined(_WIN32)
     return WaitForSingleObject(*mutex, INFINITE) == WAIT_FAILED ? -1 : 0;
#endif
     return -1;
}

int SAMutex_unlock(SAMutex *mutex)
{
     if(mutex == NULL)
          return -1;
#if defined(__unix__) || defined(__MACH__)
     return pthread_mutex_unlock(mutex) == 0 ? 0 : -1;
#elif defined(_WIN32)
     return ReleaseMutex(*mutex) != 0 ? 0 : -1;
#endif
     return -1;
}

int SAMutex_destroy(SAMutex *mutex)
{
     if(mutex == NULL)
          return -1;
#if defined(__unix__) || defined(__MACH__)
     return pthread_mutex_destroy(mutex) == 0 ? 0 : -1;
#elif defined(_WIN32)
     return CloseHandle(mutex) != 0 ? 0 : -1;
#endif
     return -1;
}

#ifdef __cplusplus
}
#endif