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SDL_SetTimer(3) SDL API Reference SDL_SetTimer(3) NAME SDL_SetTimer - Set a callback to run after the specified number of mil- liseconds has elapsed. SYNOPSIS #include "SDL.h" int SDL_SetTimer(Uint32 interval, SDL_TimerCallback callback); CALLBACK /* Function prototype for the timer callback function */ typedef Uint32 (*SDL_TimerCallback)(Uint32 interval); DESCRIPTION Set a callback to run after the specified number of milliseconds has elapsed. The callback function is passed the current timer interval and re- turns the next timer interval. If the returned value is the same as the one passed in, the periodic alarm continues, otherwise a new alarm is sched- uled. To cancel a currently running timer, call SDL_SetTimer(0, NULL); The timer callback function may run in a different thread than your main constant, and so shouldn't call any functions from within itself. The maximum resolution of this timer is 10 ms, which means that if you re- quest a 16 ms timer, your callback will run approximately 20 ms later on an unloaded system. If you wanted to set a flag signaling a frame update at 30 frames per second (every 33 ms), you might set a timer for 30 ms (see exam- ple below). If you use this function, you need to pass SDL_INIT_TIMER to SDL_Init(). Note: This function is kept for compatibility but has been superseded by the new timer functions SDL_AddTimer and SDL_RemoveTimer which sup- port multiple timers. EXAMPLES SDL_SetTimer((33/10)*10, my_callback); SEE ALSO SDL_AddTimer SDL Tue 11 Sep 2001, 23:01 SDL_SetTimer(3)
NAME | SYNOPSIS | CALLBACK | DESCRIPTION | EXAMPLES | SEE ALSO
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