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>SDL_mutexP</H1
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><H2
>Name</H2
>SDL_mutexP&nbsp;--&nbsp;Lock a mutex</DIV
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>Synopsis</H2
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><PRE
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>#include "SDL.h"
#include "SDL_thread.h"</PRE
><P
><CODE
><CODE
CLASS="FUNCDEF"
>int <B
CLASS="FSFUNC"
>SDL_mutexP</B
></CODE
>(SDL_mutex *mutex);</CODE
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><H2
>Description</H2
><P
>Locks the <TT
CLASS="PARAMETER"
><I
>mutex</I
></TT
>, which was previously created with <A
HREF="sdlcreatemutex.html"
><TT
CLASS="FUNCTION"
>SDL_CreateMutex</TT
></A
>. If the mutex is already locked then <TT
CLASS="FUNCTION"
>SDL_mutexP</TT
> will not return until it is <A
HREF="sdlmutexv.html"
>unlocked</A
>. Returns <SPAN
CLASS="RETURNVALUE"
>0</SPAN
> on success, or <SPAN
CLASS="RETURNVALUE"
>-1</SPAN
> on an error.</P
><P
>SDL also defines a macro <TT
CLASS="LITERAL"
>#define SDL_LockMutex(m) SDL_mutexP(m)</TT
>.</P
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><H2
>See Also</H2
><P
><A
HREF="sdlcreatemutex.html"
><TT
CLASS="FUNCTION"
>SDL_CreateMutex</TT
></A
>,
<A
HREF="sdlmutexv.html"
><TT
CLASS="FUNCTION"
>SDL_mutexV</TT
></A
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