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      1 /**************************************************************************
      2  *
      3  * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
      4  * Copyright 2009-2010 Chia-I Wu <olvaffe (at) 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