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

     2  *

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

     4  * copy of this software and /or associated documentation files

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

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

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

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

     9  * subject to the following conditions:

    10  *

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

    12  * in all copies or substantial portions of the Materials.

    13  *

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

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

    16  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

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

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

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

    20  * THE USE OR OTHER DEALINGS IN THE MATERIALS.

    21  *

    22  * Initial Contributors:

    23  * Nokia Corporation - initial contribution.

    24  *

    25  * Contributors:

    26  *

    27  * Description:

    28  *

    29  */

    30 

    31 #include "glesOS.h"

    32 #include "glesInternal.h"

    33 

    34 namespace

    35 {

    36 static bool g_lockInitialized = false;

    37 static GLES_LOCK g_lock;

    38 }

    39 

    40 #if defined(_WIN32)

    41 static void initializeLock()

    42 {

    43     GLES_ASSERT(!g_lockInitialized);

    44     InitializeCriticalSection(&g_lock);

    45     g_lockInitialized = true;

    46 }

    47 

    48 void glesGetLock()

    49 {

    50     if(!g_lockInitialized)

    51     {

    52         initializeLock();

    53     }

    54     EnterCriticalSection(&g_lock);

    55 }

    56 

    57 void glesReleaseLock()

    58 {

    59     GLES_ASSERT(g_lockInitialized);

    60     LeaveCriticalSection(&g_lock);

    61 }

    62 #else // defined(_WIN32)

    63 static void initializeLock()

    64 {

    65     int ret;

    66 

    67     GLES_ASSERT(!g_lockInitialized);

    68 

    69     pthread_mutexattr_t attr;

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

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

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

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

    74     ret = pthread_mutex_init(&g_lock, &attr);

    75     pthread_mutexattr_destroy(&attr);

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

    77 

    78     g_lockInitialized = true;

    79 }

    80 

    81 void glesGetLock()

    82 {

    83     if(!g_lockInitialized)

    84     {

    85         initializeLock();

    86     }

    87     int ret = pthread_mutex_lock(&g_lock);

    88     GLES_ASSERT(!ret);

    89 }

    90 

    91 void glesReleaseLock()

    92 {

    93     GLES_ASSERT(g_lockInitialized);

    94     int ret = pthread_mutex_unlock(&g_lock);

    95     GLES_ASSERT(!ret);

    96 }

    97 #endif // !defined(_WIN32)