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 #define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
  10
  11
  12 static _EGL_DECLARE_MUTEX(_eglGlobalMutex);
  13 struct _egl_global _eglGlobal =
  14 {
  15    &_eglGlobalMutex,       /* Mutex */
  16    NULL,                   /* DisplayList */
  17    1,                      /* FreeScreenHandle */
  18    0,                      /* NumDrivers */
  19    { NULL },               /* Drivers */
  20    2,                      /* NumAtExitCalls */
  21    {
  22       /* default AtExitCalls, called in reverse order */
  23       _eglUnloadDrivers, /* always called last */
  24       _eglFiniDisplay
  25    },
  26 };
  27
  28
  29 static void
  30 _eglAtExit(void)
  31 {
  32    EGLint i;
  33    for (i = _eglGlobal.NumAtExitCalls - 1; i >= 0; i--)
  34       _eglGlobal.AtExitCalls[i]();
  35 }
  36
  37
  38 void
  39 _eglAddAtExitCall(void (*func)(void))
  40 {
  41    if (func) {
  42       static EGLBoolean registered = EGL_FALSE;
  43
  44       _eglLockMutex(_eglGlobal.Mutex);
  45
  46       if (!registered) {
  47          atexit(_eglAtExit);
  48          registered = EGL_TRUE;
  49       }
  50
  51       assert(_eglGlobal.NumAtExitCalls < ARRAY_SIZE(_eglGlobal.AtExitCalls));
  52       _eglGlobal.AtExitCalls[_eglGlobal.NumAtExitCalls++] = func;
  53
  54       _eglUnlockMutex(_eglGlobal.Mutex);
  55    }
  56 }