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SDL_AddTimer(3)
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SDL_!AddTimer !!!SDL_!AddTimer NAME SYNOPSIS CALLBACK DESCRIPTION RETURN VALUE EXAMPLES SEE ALSO ---- !!NAME SDL_!AddTimer- Add a timer which will call a callback after the specified number of milliseconds has elapsed. !!SYNOPSIS __#include __ __SDL_TimerID SDL_!AddTimer__(__Uint32 interval, SDL_!NewTimerCallback callback, void *param__); !!CALLBACK /* type definition for the !!DESCRIPTION Adds a callback function to be run after the specified number of milliseconds has elapsed. The callback function is passed the current timer interval and the user supplied parameter from the __SDL_!AddTimer__ call and returns the next timer interval. If the returned value from the callback is the same as the one passed in, the periodic alarm continues, otherwise a new alarm is scheduled. To cancel a currently running timer call ''SDL_!RemoveTimer'' with the timer ID returned from __SDL_!AddTimer__. The timer callback function may run in a different thread than your main program, and so shouldn't call any functions from within itself. The maximum resolution of this timer is 10 ms, which means that if you request 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 example below). If you use this function, you need to pass __SDL_INIT_TIMER__ to ''SDL_Init''. !!RETURN VALUE Returns an ID value for the added timer or __NULL__ if there was an error. !!EXAMPLES my_timer_id = SDL_!AddTimer((33/10)*10, my_callbackfunc, my_callback_param); !!SEE ALSO __SDL_!RemoveTimer__ ----
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