src/egl/main/eglglobals.c

   1 #include <stdlib.h>
   2 #include <assert.h>
   3 #include "eglglobals.h"
   4 #include "egldriver.h"
   5 #include "egllog.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    {                       /* AtExitCalls */
  22       _eglFiniDisplay,
  23       _eglUnloadDrivers
  24    },
  25 };
  26
  27
  28 static void
  29 _eglAtExit(void)
  30 {
  31    EGLint i;
  32    for (i = _eglGlobal.NumAtExitCalls - 1; i >= 0; i--)
  33       _eglGlobal.AtExitCalls[i]();
  34 }
  35
  36
  37 void
  38 _eglAddAtExitCall(void (*func)(void))
  39 {
  40    if (func) {
  41       static EGLBoolean registered = EGL_FALSE;
  42
  43       _eglLockMutex(_eglGlobal.Mutex);
  44
  45       if (!registered) {
  46          atexit(_eglAtExit);
  47          registered = EGL_TRUE;
  48       }
  49
  50       assert(_eglGlobal.NumAtExitCalls < ARRAY_SIZE(_eglGlobal.AtExitCalls));
  51       _eglGlobal.AtExitCalls[_eglGlobal.NumAtExitCalls++] = func;
  52
  53       _eglUnlockMutex(_eglGlobal.Mutex);
  54    }
  55 }