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sdl_addtimer(3) [centos man page]

SDL_AddTimer(3) 						 SDL API Reference						   SDL_AddTimer(3)

NAME
SDL_AddTimer - Add a timer which will call a callback after the specified number of milliseconds has elapsed. SYNOPSIS
#include "SDL.h" SDL_TimerID SDL_AddTimer(Uint32 interval, SDL_NewTimerCallback callback, void *param); CALLBACK
/* type definition for the "new" timer callback function */ typedef Uint32 (*SDL_NewTimerCallback)(Uint32 interval, void *param); 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. You may always call SDL_PushEvent, however. The granularity of the timer is platform-dependent, but you should count on it being at least 10 ms as this is the most common number. This 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, SDL_PushEvent SDL
Tue 11 Sep 2001, 23:01 SDL_AddTimer(3)

Check Out this Related Man Page

SDL_SetTimer(3) 						 SDL API Reference						   SDL_SetTimer(3)

NAME
SDL_SetTimer- Set a callback to run after the specified number of milliseconds 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 returns 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 scheduled. 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 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(). Note: This function is kept for compatibility but has been superseded by the new timer functions SDL_AddTimer and SDL_RemoveTimer which support multiple timers. EXAMPLES
SDL_SetTimer((33/10)*10, my_callback); SEE ALSO
SDL_AddTimer SDL
Tue 11 Sep 2001, 23:01 SDL_SetTimer(3)
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