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 "c11/threads.h"
  34
  35 #include "eglglobals.h"
  36 #include "egldisplay.h"
  37 #include "egldriver.h"
  38
  39
  40 static mtx_t _eglGlobalMutex = _MTX_INITIALIZER_NP;
  41
  42 struct _egl_global _eglGlobal =
  43 {
  44    &_eglGlobalMutex,       /* Mutex */
  45    NULL,                   /* DisplayList */
  46    2,                      /* NumAtExitCalls */
  47    {
  48       /* default AtExitCalls, called in reverse order */
  49       _eglUnloadDrivers, /* always called last */
  50       _eglFiniDisplay
  51    },
  52
  53    /* ClientExtensionsString */
  54    "EGL_EXT_client_extensions"
  55    " EGL_EXT_platform_base"
  56    " EGL_EXT_platform_wayland"
  57    " EGL_EXT_platform_x11"
  58    " EGL_KHR_client_get_all_proc_addresses"
  59    " EGL_MESA_platform_gbm"
  60 };
  61
  62
  63 static void
  64 _eglAtExit(void)
  65 {
  66    EGLint i;
  67    for (i = _eglGlobal.NumAtExitCalls - 1; i >= 0; i--)
  68       _eglGlobal.AtExitCalls[i]();
  69 }
  70
  71
  72 void
  73 _eglAddAtExitCall(void (*func)(void))
  74 {
  75    if (func) {
  76       static EGLBoolean registered = EGL_FALSE;
  77
  78       mtx_lock(_eglGlobal.Mutex);
  79
  80       if (!registered) {
  81          atexit(_eglAtExit);
  82          registered = EGL_TRUE;
  83       }
  84
  85       assert(_eglGlobal.NumAtExitCalls < ARRAY_SIZE(_eglGlobal.AtExitCalls));
  86       _eglGlobal.AtExitCalls[_eglGlobal.NumAtExitCalls++] = func;
  87
  88       mtx_unlock(_eglGlobal.Mutex);
  89    }
  90 }