src/egl/main/eglglobals.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 VMware, Inc.
   4  * Copyright 2009-2010 Chia-I Wu <olvaffe@gmail.com>
   5  * Copyright 2010-2011 LunarG, Inc.
   6  * All Rights Reserved.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the
  10  * "Software"), to deal in the Software without restriction, including
  11  * without limitation the rights to use, copy, modify, merge, publish,
  12  * distribute, sub license, and/or sell copies of the Software, and to
  13  * permit persons to whom the Software is furnished to do so, subject to
  14  * the following conditions:
  15  *
  16  * The above copyright notice and this permission notice (including the
  17  * next paragraph) shall be included in all copies or substantial portions
  18  * of the Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  23  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  24  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  25  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  26  * DEALINGS IN THE SOFTWARE.
  27  *
  28  **************************************************************************/
  29
  30
  31 #include <stdlib.h>
  32 #include <assert.h>
  33 #include "eglglobals.h"
  34 #include "egldisplay.h"
  35 #include "egldriver.h"
  36 #include "eglmutex.h"
  37
  38
  39 static _EGLMutex _eglGlobalMutex = _EGL_MUTEX_INITIALIZER;
  40
  41 struct _egl_global _eglGlobal =
  42 {
  43    &_eglGlobalMutex,       /* Mutex */
  44    NULL,                   /* DisplayList */
  45    2,                      /* NumAtExitCalls */
  46    {
  47       /* default AtExitCalls, called in reverse order */
  48       _eglUnloadDrivers, /* always called last */
  49       _eglFiniDisplay
  50    },
  51
  52    /* ClientExtensions */
  53    {
  54       true /* EGL_EXT_client_extensions */
  55    },
  56
  57    /* ClientExtensionsString */
  58    "EGL_EXT_client_extensions"
  59 };
  60
  61
  62 static void
  63 _eglAtExit(void)
  64 {
  65    EGLint i;
  66    for (i = _eglGlobal.NumAtExitCalls - 1; i >= 0; i--)
  67       _eglGlobal.AtExitCalls[i]();
  68 }
  69
  70
  71 void
  72 _eglAddAtExitCall(void (*func)(void))
  73 {
  74    if (func) {
  75       static EGLBoolean registered = EGL_FALSE;
  76
  77       _eglLockMutex(_eglGlobal.Mutex);
  78
  79       if (!registered) {
  80          atexit(_eglAtExit);
  81          registered = EGL_TRUE;
  82       }
  83
  84       assert(_eglGlobal.NumAtExitCalls < ARRAY_SIZE(_eglGlobal.AtExitCalls));
  85       _eglGlobal.AtExitCalls[_eglGlobal.NumAtExitCalls++] = func;
  86
  87       _eglUnlockMutex(_eglGlobal.Mutex);
  88    }
  89 }