SDL_!AddTimer?- Add a timer which will call a callback after the specified number of milliseconds has elapsed.
SDL_TimerID SDL_!AddTimer?(__Uint32 interval,
SDL_!NewTimerCallback? callback, void
/* type definition for the
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
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.
Returns an ID value for the added timer or NULL if
there was an error.
my_timer_id = SDL_!AddTimer?((33/10)*10, my_callbackfunc, my_callback_param);