win32_critical.h

linux下实现视频播放的播放器

/*
 *  Copyright (C) 2005-2007  gulikoza
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/* $Id$ */

/* Mutex functions using the Win32 Critical Section */

#ifndef CRITICAL_H
#define CRITICAL_H

#define MODULE "Critical"
#include "log.h"

#ifdef WIN32

#define MUTEX WIN_mutex

#ifdef SEM_SILENT
#define MUTEX_LOCK(x) WIN_LockMutex(x)
#else
#define MUTEX_LOCK(x) WIN_LockMutex(x, #x)
#endif

#define MUTEX_UNLOCK(x) WIN_UnlockMutex(x)
#define MUTEX_CREATE WIN_CreateMutex
#define MUTEX_DESTROY(x) WIN_DestroyMutex(x)

struct WIN_mutex {
    CRITICAL_SECTION cs;
#ifndef SEM_SILENT
    unsigned int thread;
    HANDLE hSemaphore;
#endif
};

#include "SDL_Error.h"

#include "SDL_timer.h"
#include "SDL_thread.h"

/* Create a mutex */
static inline WIN_mutex *WIN_CreateMutex(void)
{
    WIN_mutex *mutex;

    /* Allocate mutex memory */
    mutex = (WIN_mutex *)malloc(sizeof(*mutex));
    if(mutex) {
#ifndef SEM_SILENT
	// Create waiting semaphore
	mutex->hSemaphore = CreateSemaphore(NULL, 0, 1, NULL);
	if(mutex->hSemaphore == NULL) {
	    ERROR_MSG("Error creating mutex semaphore");
	    free(mutex);
	    return NULL;
	}
	mutex->thread = 0;
#endif

	/* Create the mutex */
	InitializeCriticalSection(&mutex->cs);

    } else {
	SDL_OutOfMemory();
    }
    return mutex;
}

/* Free the mutex */
static inline void WIN_DestroyMutex(WIN_mutex *mutex)
{
    if(mutex) {
#ifndef SEM_SILENT
	if(mutex->thread != 0) {
	    ERROR_MSG("WARNING: Destroying locked mutex (%d)!", mutex->thread);
	}
	CloseHandle(mutex->hSemaphore);
#endif
	DeleteCriticalSection(&mutex->cs);
	free(mutex);
    }
}

/* Lock the mutex */
#ifdef SEM_SILENT
static inline int WIN_LockMutex(WIN_mutex *mutex)
{
    EnterCriticalSection(&mutex->cs);
#else
static inline int WIN_LockMutex(WIN_mutex *mutex, const char * name)
{
    while(!TryEnterCriticalSection(&mutex->cs)) {
	if(WaitForSingleObject(mutex->hSemaphore, 1000L)) {
	    ERROR_MSG("Thread %u mutex timeout %s, owning thread: %u", SDL_ThreadID(), name, mutex->thread);
	}
    }
    if(mutex->thread != 0) {
	ERROR_MSG("WARNING: Thread %u (=%u) re-entering mutex %s", SDL_ThreadID(), mutex->thread, name);
    }
    mutex->thread = SDL_ThreadID();
#endif
    return 0;
}

/* Unlock the mutex */
static inline int WIN_UnlockMutex(WIN_mutex *mutex)
{
#ifndef SEM_SILENT
    mutex->thread = 0;
#endif
    LeaveCriticalSection(&mutex->cs);
#ifndef SEM_SILENT
    ReleaseSemaphore(mutex->hSemaphore, 1, NULL);
#endif
    return 0;
}

#endif // WIN32

#undef MODULE
#endif // CRITICAL_H