view docs/man3/SDL_SetTimer.3 @ 2281:6359f74f3170

Date: Wed, 14 Nov 2007 22:20:27 -0500 From: Calvin Vette Subject: Fix to compile SDL-1.2 SVN on OS X Leopard I found I needed to add a conditional check for Leopard to compile cleanly on 1.2-SVN (20071114): #include <AudioUnit/AudioUnit.h> #ifdef AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER #include <AudioUnit/AUNTComponent.h> #endif where there is now just: #include <AudioUnit/AudioUnit.h>
author Sam Lantinga <slouken@libsdl.org>
date Fri, 28 Dec 2007 18:16:42 +0000
parents e5bc29de3f0a
children 546f7c1eb755
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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This function is kept for compatibility but has been superseded by the new timer functions \fISDL_AddTimer\fR and \fISDL_RemoveTimer\fR which support multiple timers\&.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