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 associated documentation files (the "Software"),

     5  * to deal in the Software without restriction, including without limitation

     6  * the rights to use, copy, modify, merge, publish, distribute, sublicense,

     7  * and/or sell copies of the Software, and to permit persons to whom the

     8  * Software is furnished to do so, subject to the following conditions:

     9  *

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

    11  * in all copies or substantial portions of the Software.

    12  *

    13  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

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

    15  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

    16  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN

    17  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

    18  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

    19  *

    20  * Initial Contributors:

    21  * Nokia Corporation - initial contribution.

    22  *

    23  * Contributors:

    24  *

    25  * Description:

    26  *

    27  */

    28 

    29 #include "common.h"

    30 #include "platform.h"

    31 

    32 static int dgl_lock_initialized = 0;

    33 static DGLES2_LOCK dgl_lock;

    34 

    35 #ifdef _WIN32

    36 static void dglInitializeLock(void)

    37 {

    38     InitializeCriticalSection(&dgl_lock);

    39     dgl_lock_initialized = 1;

    40 }

    41 

    42 void dglGetLock(void)

    43 {

    44     if(!dgl_lock_initialized)

    45     {

    46         dglInitializeLock();

    47     }

    48     EnterCriticalSection(&dgl_lock);

    49 }

    50 

    51 void dglReleaseLock(void)

    52 {

    53     DGLES2_ASSERT(dgl_lock_initialized);

    54     LeaveCriticalSection(&dgl_lock);

    55 }

    56 #else /* _WIN32 */

    57 static void initializeLock()

    58 {

    59     int ret;

    60 

    61     DGLES2_ASSERT(!dgl_lock_initialized);

    62 

    63     pthread_mutexattr_t attr;

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

    65     DGLES2_ASSERT(!ret);	//check that there aren't any errors

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

    67     DGLES2_ASSERT(!ret);	//check that there aren't any errors

    68     ret = pthread_mutex_init(&dgl_lock, &attr);

    69     pthread_mutexattr_destroy(&attr);

    70     DGLES2_ASSERT(!ret);	//check that there aren't more errors

    71 

    72     dgl_lock_initialized = 1;

    73 }

    74 

    75 void glesGetLock()

    76 {

    77     if(!dgl_lock_initialized)

    78     {

    79         initializeLock();

    80     }

    81     int ret = pthread_mutex_lock(&dgl_lock);

    82     DGLES2_ASSERT(!ret);

    83 }

    84 

    85 void glesReleaseLock()

    86 {

    87     DGLES2_ASSERT(dgl_lock_initialized);

    88     int ret = pthread_mutex_unlock(&dgl_lock);

    89     DGLES2_ASSERT(!ret);

    90 }

    91 #endif