/* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and /or associated documentation files

 * (the "Materials "), to deal in the Materials without restriction,

 * including without limitation the rights to use, copy, modify, merge,

 * publish, distribute, sublicense, and/or sell copies of the Materials,

 * and to permit persons to whom the Materials are furnished to do so,

 * subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included

 * in all copies or substantial portions of the Materials.

 *

 * THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,

 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR

 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE MATERIALS OR

 * THE USE OR OTHER DEALINGS IN THE MATERIALS.

 *

 * Initial Contributors:

 * Nokia Corporation - initial contribution.

 *

 * Contributors:

 *

 * Description:

 *

 */

#include "glesOS.h"

#include "glesInternal.h"

namespace

{

static bool g_lockInitialized = false;

static GLES_LOCK g_lock;

}

#if defined(_WIN32)

static void initializeLock()

{

    GLES_ASSERT(!g_lockInitialized);

    InitializeCriticalSection(&g_lock);

    g_lockInitialized = true;

}

void glesGetLock()

{

    if(!g_lockInitialized)

    {

        initializeLock();

    }

    EnterCriticalSection(&g_lock);

}

void glesReleaseLock()

{

    GLES_ASSERT(g_lockInitialized);

    LeaveCriticalSection(&g_lock);

}

#else // defined(_WIN32)

static void initializeLock()

{

    int ret;

    GLES_ASSERT(!g_lockInitialized);

    pthread_mutexattr_t attr;

    ret = pthread_mutexattr_init(&attr);	//initially not locked

    GLES_ASSERT(!ret);	//check that there aren't any errors

    ret = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);	//count the number of recursive locks

    GLES_ASSERT(!ret);	//check that there aren't any errors

    ret = pthread_mutex_init(&g_lock, &attr);

    pthread_mutexattr_destroy(&attr);

    GLES_ASSERT(!ret);	//check that there aren't more errors

    g_lockInitialized = true;

}

void glesGetLock()

{

    if(!g_lockInitialized)

    {

        initializeLock();

    }

    int ret = pthread_mutex_lock(&g_lock);

    GLES_ASSERT(!ret);

}

void glesReleaseLock()

{

    GLES_ASSERT(g_lockInitialized);

    int ret = pthread_mutex_unlock(&g_lock);

    GLES_ASSERT(!ret);

}

#endif // !defined(_WIN32)