[AD] OSX - lockup

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More of a note to myself, really, as I'm away this weekend. Solak has found a lock-up when using vsync() whilst the screen is acquired
http://www.allegro.cc/forums/view_thread.php?_id=524355

acquire_bitmap(screen);
 vsync(); /* problem here */
 rect(10, 10, SCREEN_W - 10, SCREEN_H - 10, makecol(255, 255, 255));
 release_bitmap(screen);
 vsync();


I'll send a fix in soon; I think the most sensible course is that vsync should be a no-op if the screen is acquired. Any comments?

Pete





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