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| >SDL_SetTimer</A |
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| ><A |
| NAME="AEN8008" |
| ></A |
| ><H2 |
| >Name</H2 |
| >SDL_SetTimer -- Set a callback to run after the specified number of milliseconds has |
| elapsed.</DIV |
| ><DIV |
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| ><A |
| NAME="AEN8011" |
| ></A |
| ><H2 |
| >Synopsis</H2 |
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| ><A |
| NAME="AEN8012" |
| ></A |
| ><P |
| ></P |
| ><PRE |
| CLASS="FUNCSYNOPSISINFO" |
| >#include "SDL.h"</PRE |
| ><P |
| ><CODE |
| ><CODE |
| CLASS="FUNCDEF" |
| >int <B |
| CLASS="FSFUNC" |
| >SDL_SetTimer</B |
| ></CODE |
| >(Uint32 interval, SDL_TimerCallback callback);</CODE |
| ></P |
| ><P |
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| ><A |
| NAME="SDLTIMERCALLBACK" |
| ></A |
| ><H2 |
| >Callback</H2 |
| ><P |
| >/* Function prototype for the timer callback function */ |
| typedef Uint32 (*SDL_TimerCallback)(Uint32 interval);</P |
| ></DIV |
| ><DIV |
| CLASS="REFSECT1" |
| ><A |
| NAME="AEN8021" |
| ></A |
| ><H2 |
| >Description</H2 |
| ><P |
| >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.</P |
| ><P |
| >To cancel a currently running timer, call |
| <TT |
| CLASS="FUNCTION" |
| >SDL_SetTimer(0, NULL);</TT |
| ></P |
| ><P |
| >The timer callback function may run in a different thread than your |
| main constant, and so shouldn't call any functions from within itself.</P |
| ><P |
| >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).</P |
| ><P |
| >If you use this function, you need to pass <TT |
| CLASS="LITERAL" |
| >SDL_INIT_TIMER</TT |
| > |
| to <TT |
| CLASS="FUNCTION" |
| >SDL_Init()</TT |
| >.</P |
| ><DIV |
| CLASS="NOTE" |
| ><BLOCKQUOTE |
| CLASS="NOTE" |
| ><P |
| ><B |
| >Note: </B |
| >This function is kept for compatibility but has been superseded |
| by the new timer functions |
| <A |
| HREF="sdladdtimer.html" |
| >SDL_AddTimer</A |
| > and |
| <A |
| HREF="sdlremovetimer.html" |
| >SDL_RemoveTimer</A |
| > which support |
| multiple timers.</P |
| ></BLOCKQUOTE |
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| CLASS="REFSECT1" |
| ><A |
| NAME="AEN8035" |
| ></A |
| ><H2 |
| >Examples</H2 |
| ><P |
| ><PRE |
| CLASS="PROGRAMLISTING" |
| >SDL_SetTimer((33/10)*10, my_callback);</PRE |
| ></P |
| ></DIV |
| ><DIV |
| CLASS="REFSECT1" |
| ><A |
| NAME="AEN8039" |
| ></A |
| ><H2 |
| >See Also</H2 |
| ><P |
| ><A |
| HREF="sdladdtimer.html" |
| ><TT |
| CLASS="FUNCTION" |
| >SDL_AddTimer</TT |
| ></A |
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