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diff src/SDL_compat.c @ 5113:481dabb098ef

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Improved timer implementation The new timer model is formalized as using a separate thread to handle timer callbacks. This was the case on almost every platform before, but it's now a requirement, and simplifies the implementation and makes it perform consistently across platforms. Goals: * Minimize timer thread blocking * Dispatch timers as accurately as possible * SDL_AddTimer() and SDL_RemoveTimer() are completely threadsafe * SDL_RemoveTimer() doesn't crash with a timer that's expired or removed
author Sam Lantinga <slouken@libsdl.org>
date Thu, 27 Jan 2011 14:45:06 -0800
parents da347bfed240
children c8e049de174c
line wrap: on
line diff
--- a/src/SDL_compat.c	Thu Jan 27 10:40:17 2011 -0800
+++ b/src/SDL_compat.c	Thu Jan 27 14:45:06 2011 -0800
@@ -1760,6 +1760,31 @@
     return previous;
 }
 
+static Uint32
+SDL_SetTimerCallback(Uint32 interval, void* param)
+{
+    return ((SDL_OldTimerCallback)param)(interval);
+}
+
+int
+SDL_SetTimer(Uint32 interval, SDL_OldTimerCallback callback)
+{
+    static SDL_TimerID compat_timer;
+
+    if (compat_timer) {
+        SDL_RemoveTimer(compat_timer);
+        compat_timer = 0;
+    }
+
+    if (interval && callback) {
+        compat_timer = SDL_AddTimer(interval, SDL_SetTimerCallback, callback);
+        if (!compat_timer) {
+            return -1;
+        }
+    }
+    return 0;
+}
+
 int
 SDL_putenv(const char *_var)
 {