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  1. /**************************************************************************
  2.  *
  3.  * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
  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 _EGL_DECLARE_MUTEX(_eglGlobalMutex);
  40. struct _egl_global _eglGlobal =
  41. {
  42.    &_eglGlobalMutex,       /* Mutex */
  43.    NULL,                   /* DisplayList */
  44.    2,                      /* NumAtExitCalls */
  45.    {
  46.       /* default AtExitCalls, called in reverse order */
  47.       _eglUnloadDrivers, /* always called last */
  48.       _eglFiniDisplay
  49.    },
  50. };
  51.  
  52.  
  53. static void
  54. _eglAtExit(void)
  55. {
  56.    EGLint i;
  57.    for (i = _eglGlobal.NumAtExitCalls - 1; i >= 0; i--)
  58.       _eglGlobal.AtExitCalls[i]();
  59. }
  60.  
  61.  
  62. void
  63. _eglAddAtExitCall(void (*func)(void))
  64. {
  65.    if (func) {
  66.       static EGLBoolean registered = EGL_FALSE;
  67.  
  68.       _eglLockMutex(_eglGlobal.Mutex);
  69.  
  70.       if (!registered) {
  71.          atexit(_eglAtExit);
  72.          registered = EGL_TRUE;
  73.       }
  74.  
  75.       assert(_eglGlobal.NumAtExitCalls < ARRAY_SIZE(_eglGlobal.AtExitCalls));
  76.       _eglGlobal.AtExitCalls[_eglGlobal.NumAtExitCalls++] = func;
  77.  
  78.       _eglUnlockMutex(_eglGlobal.Mutex);
  79.    }
  80. }
  81.