src/egl/main/eglglobals.c

   1 #include <stdlib.h>
   2 #include <assert.h>
   3 #include "eglglobals.h"
   4 #include "egldisplay.h"
   5 #include "egldriver.h"
   6 #include "eglmutex.h"
   7
   8
   9 static _EGL_DECLARE_MUTEX(_eglGlobalMutex);
  10 struct _egl_global _eglGlobal =
  11 {
  12    &_eglGlobalMutex,       /* Mutex */
  13    NULL,                   /* DisplayList */
  14    1,                      /* FreeScreenHandle */
  15    0,                      /* NumDrivers */
  16    { NULL },               /* Drivers */
  17    2,                      /* NumAtExitCalls */
  18    {
  19       /* default AtExitCalls, called in reverse order */
  20       _eglUnloadDrivers, /* always called last */
  21       _eglFiniDisplay
  22    },
  23 };
  24
  25
  26 static void
  27 _eglAtExit(void)
  28 {
  29    EGLint i;
  30    for (i = _eglGlobal.NumAtExitCalls - 1; i >= 0; i--)
  31       _eglGlobal.AtExitCalls[i]();
  32 }
  33
  34
  35 void
  36 _eglAddAtExitCall(void (*func)(void))
  37 {
  38    if (func) {
  39       static EGLBoolean registered = EGL_FALSE;
  40
  41       _eglLockMutex(_eglGlobal.Mutex);
  42
  43       if (!registered) {
  44          atexit(_eglAtExit);
  45          registered = EGL_TRUE;
  46       }
  47
  48       assert(_eglGlobal.NumAtExitCalls < ARRAY_SIZE(_eglGlobal.AtExitCalls));
  49       _eglGlobal.AtExitCalls[_eglGlobal.NumAtExitCalls++] = func;
  50
  51       _eglUnlockMutex(_eglGlobal.Mutex);
  52    }
  53 }