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40 lines
1.7 KiB
Groff
40 lines
1.7 KiB
Groff
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.TH "SDL_SetTimer" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference"
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.SH "NAME"
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SDL_SetTimer \- Set a callback to run after the specified number of milliseconds has elapsed\&.
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.SH "SYNOPSIS"
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.PP
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\fB#include "SDL\&.h"
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.sp
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\fBint \fBSDL_SetTimer\fP\fR(\fBUint32 interval, SDL_TimerCallback callback\fR);
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.SH "CALLBACK"
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.PP
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/* Function prototype for the timer callback function */ typedef Uint32 (*SDL_TimerCallback)(Uint32 interval);
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.SH "DESCRIPTION"
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.PP
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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\&.
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.PP
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To cancel a currently running timer, call \fBSDL_SetTimer(0, NULL);\fP
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.PP
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The timer callback function may run in a different thread than your main constant, and so shouldn\&'t call any functions from within itself\&.
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.PP
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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)\&.
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.PP
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If you use this function, you need to pass \fBSDL_INIT_TIMER\fP to \fBSDL_Init()\fP\&.
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.PP
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.RS
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\fBNote:
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.PP
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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\&.
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.RE
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.SH "EXAMPLES"
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.PP
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.PP
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.nf
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\f(CWSDL_SetTimer((33/10)*10, my_callback);\fR
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.fi
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.PP
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.SH "SEE ALSO"
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.PP
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\fI\fBSDL_AddTimer\fP\fR
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.\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01
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