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><H1
><A
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></A
>SDL_SemPost</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN8170"
></A
><H2
>Name</H2
>SDL_SemPost&nbsp;--&nbsp;Unlock a semaphore.</DIV
><DIV
CLASS="REFSYNOPSISDIV"
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><H2
>Synopsis</H2
><DIV
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><P
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><PRE
CLASS="FUNCSYNOPSISINFO"
>#include "SDL.h"
#include "SDL_thread.h"</PRE
><P
><CODE
><CODE
CLASS="FUNCDEF"
>int <B
CLASS="FSFUNC"
>SDL_SemPost</B
></CODE
>(SDL_sem *sem);</CODE
></P
><P
></P
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><DIV
CLASS="REFSECT1"
><A
NAME="AEN8180"
></A
><H2
>Description</H2
><P
><TT
CLASS="FUNCTION"
>SDL_SemPost</TT
> unlocks the semaphore pointed to by
<TT
CLASS="PARAMETER"
><I
>sem</I
></TT
> and atomically increments the semaphores value.
Threads that were blocking on the semaphore may be scheduled after this call
succeeds.</P
><P
><TT
CLASS="FUNCTION"
>SDL_SemPost</TT
> should be called after a semaphore is locked by a successful call to
<A
HREF="sdlsemwait.html"
>SDL_SemWait</A
>,
<A
HREF="sdlsemtrywait.html"
>SDL_SemTryWait</A
> or
<A
HREF="sdlsemwaittimeout.html"
>SDL_SemWaitTimeout</A
>.</P
></DIV
><DIV
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><A
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></A
><H2
>Return Value</H2
><P
>Returns <SPAN
CLASS="RETURNVALUE"
>0</SPAN
> if successful or
<SPAN
CLASS="RETURNVALUE"
>-1</SPAN
> if there was an error (leaving the semaphore unchanged).</P
></DIV
><DIV
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><A
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></A
><H2
>Examples</H2
><P
><PRE
CLASS="PROGRAMLISTING"
>SDL_SemPost(my_sem);</PRE
></P
></DIV
><DIV
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><A
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></A
><H2
>See Also</H2
><P
><A
HREF="sdlcreatesemaphore.html"
><TT
CLASS="FUNCTION"
>SDL_CreateSemaphore</TT
></A
>,
<A
HREF="sdldestroysemaphore.html"
><TT
CLASS="FUNCTION"
>SDL_DestroySemaphore</TT
></A
>,
<A
HREF="sdlsemwait.html"
><TT
CLASS="FUNCTION"
>SDL_SemWait</TT
></A
>,
<A
HREF="sdlsemtrywait.html"
><TT
CLASS="FUNCTION"
>SDL_SemTryWait</TT
></A
>,
<A
HREF="sdlsemwaittimeout.html"
><TT
CLASS="FUNCTION"
>SDL_SemWaitTimeout</TT
></A
>,
<A
HREF="sdlsemvalue.html"
><TT
CLASS="FUNCTION"
>SDL_SemValue</TT
></A
></P
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author	Sam Lantinga <slouken@libsdl.org>
date	Sat, 17 Oct 2009 06:55:17 +0000
parents	355632dca928
children