Mercurial > sdl-ios-xcode
view docs/man3/SDL_SetTimer.3 @ 4357:a10dac5858fe SDL-1.2
Recommendation from Lennart Poettering:
In ALSA_OpenAudio(): instead of setting period_size+n_periods OR
buffer_size I'd recommend copying the hwparams stuff before you do
this, then first try period_size+n_periods, and then apply it with
snd_pcm_hw_params() and check if that works. If it didn't you should
take the copy of hwparams and try setting buffer_size and apply that
via snd_pcm_hw_params() and check if that worked. And if that failed
too, then take the copy and don't apply neither period nor buffer
settings and see if that works.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 19 Oct 2009 02:23:21 +0000 |
| parents | 1238da4a7112 |
| children |
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.TH "SDL_SetTimer" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference" .SH "NAME" SDL_SetTimer \- Set a callback to run after the specified number of milliseconds has elapsed\&. .SH "SYNOPSIS" .PP \fB#include "SDL\&.h" .sp \fBint \fBSDL_SetTimer\fP\fR(\fBUint32 interval, SDL_TimerCallback callback\fR); .SH "CALLBACK" .PP /* Function prototype for the timer callback function */ typedef Uint32 (*SDL_TimerCallback)(Uint32 interval); .SH "DESCRIPTION" .PP 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\&. .PP To cancel a currently running timer, call \fBSDL_SetTimer(0, NULL);\fP .PP The timer callback function may run in a different thread than your main constant, and so shouldn\&'t call any functions from within itself\&. .PP 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)\&. .PP If you use this function, you need to pass \fBSDL_INIT_TIMER\fP to \fBSDL_Init()\fP\&. .PP .RS \fBNote: .PP This function is kept for compatibility but has been superseded by the new timer functions \fISDL_AddTimer\fR and \fISDL_RemoveTimer\fR which support multiple timers\&. .RE .SH "EXAMPLES" .PP .PP .nf \f(CWSDL_SetTimer((33/10)*10, my_callback);\fR .fi .PP .SH "SEE ALSO" .PP \fI\fBSDL_AddTimer\fP\fR .\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01