egl: Add _eglAddAtExitCall.

Add a convenient wrapper to register atexit calls.  Add mutex to
_eglGlobal along the way.

Signed-off-by: Chia-I Wu <[email protected]>

1 files changed, 40 insertions, 0 deletions

diff --git a/src/egl/main/eglglobals.c b/src/egl/main/eglglobals.c
index 87031686500..e93b48e03b8 100644
--- a/src/egl/main/eglglobals.c
+++ b/src/egl/main/eglglobals.c
@@ -1,13 +1,53 @@
 #include <stdlib.h>
+#include <assert.h>
 #include "eglglobals.h"
 #include "egldisplay.h"
 #include "egllog.h"
+#include "eglmutex.h"
 
+
+#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
+
+
+static _EGL_DECLARE_MUTEX(_eglGlobalMutex);
 struct _egl_global _eglGlobal =
 {
+   &_eglGlobalMutex,       /* Mutex */
    1,                      /* FreeScreenHandle */
    0x0,                    /* ClientAPIsMask */
    { 0x0 },                /* ClientAPIs */
    0,                      /* NumDrivers */
    { NULL },               /* Drivers */
+   0,                      /* NumAtExitCalls */
+   { NULL },               /* AtExitCalls */
 };
+
+
+static void
+_eglAtExit(void)
+{
+   EGLint i;
+   for (i = _eglGlobal.NumAtExitCalls - 1; i >= 0; i--)
+      _eglGlobal.AtExitCalls[i]();
+}
+
+
+void
+_eglAddAtExitCall(void (*func)(void))
+{
+   if (func) {
+      static EGLBoolean registered = EGL_FALSE;
+
+      _eglLockMutex(_eglGlobal.Mutex);
+
+      if (!registered) {
+         atexit(_eglAtExit);
+         registered = EGL_TRUE;
+      }
+
+      assert(_eglGlobal.NumAtExitCalls < ARRAY_SIZE(_eglGlobal.AtExitCalls));
+      _eglGlobal.AtExitCalls[_eglGlobal.NumAtExitCalls++] = func;
+
+      _eglUnlockMutex(_eglGlobal.Mutex);
+   }
+}