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+<HTML
+><HEAD
+><TITLE
+>SDL_SemWait</TITLE
+><META
+NAME="GENERATOR"
+CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
+"><LINK
+REL="HOME"
+TITLE="SDL Library Documentation"
+HREF="index.html"><LINK
+REL="UP"
+TITLE="Multi-threaded Programming"
+HREF="thread.html"><LINK
+REL="PREVIOUS"
+TITLE="SDL_DestroySemaphore"
+HREF="sdldestroysemaphore.html"><LINK
+REL="NEXT"
+TITLE="SDL_SemTryWait"
+HREF="sdlsemtrywait.html"></HEAD
+><BODY
+CLASS="REFENTRY"
+BGCOLOR="#FFF8DC"
+TEXT="#000000"
+LINK="#0000ee"
+VLINK="#551a8b"
+ALINK="#ff0000"
+><DIV
+CLASS="NAVHEADER"
+><TABLE
+SUMMARY="Header navigation table"
+WIDTH="100%"
+BORDER="0"
+CELLPADDING="0"
+CELLSPACING="0"
+><TR
+><TH
+COLSPAN="3"
+ALIGN="center"
+>SDL Library Documentation</TH
+></TR
+><TR
+><TD
+WIDTH="10%"
+ALIGN="left"
+VALIGN="bottom"
+><A
+HREF="sdldestroysemaphore.html"
+ACCESSKEY="P"
+>Prev</A
+></TD
+><TD
+WIDTH="80%"
+ALIGN="center"
+VALIGN="bottom"
+></TD
+><TD
+WIDTH="10%"
+ALIGN="right"
+VALIGN="bottom"
+><A
+HREF="sdlsemtrywait.html"
+ACCESSKEY="N"
+>Next</A
+></TD
+></TR
+></TABLE
+><HR
+ALIGN="LEFT"
+WIDTH="100%"></DIV
+><H1
+><A
+NAME="SDLSEMWAIT"
+></A
+>SDL_SemWait</H1
+><DIV
+CLASS="REFNAMEDIV"
+><A
+NAME="AEN8023"
+></A
+><H2
+>Name</H2
+>SDL_SemWait&nbsp;--&nbsp;Lock a semaphore and suspend the thread if the semaphore value is zero.</DIV
+><DIV
+CLASS="REFSYNOPSISDIV"
+><A
+NAME="AEN8026"
+></A
+><H2
+>Synopsis</H2
+><DIV
+CLASS="FUNCSYNOPSIS"
+><A
+NAME="AEN8027"
+></A
+><P
+></P
+><PRE
+CLASS="FUNCSYNOPSISINFO"
+>#include "SDL.h"
+#include "SDL_thread.h"</PRE
+><P
+><CODE
+><CODE
+CLASS="FUNCDEF"
+>int <B
+CLASS="FSFUNC"
+>SDL_SemWait</B
+></CODE
+>(SDL_sem *sem);</CODE
+></P
+><P
+></P
+></DIV
+></DIV
+><DIV
+CLASS="REFSECT1"
+><A
+NAME="AEN8033"
+></A
+><H2
+>Description</H2
+><P
+><TT
+CLASS="FUNCTION"
+>SDL_SemWait()</TT
+> suspends the calling thread until either
+the semaphore pointed to by <TT
+CLASS="PARAMETER"
+><I
+>sem</I
+></TT
+> has a positive value,
+the call is interrupted by a signal or error. If the call is successful it
+will atomically decrement the semaphore value.</P
+><P
+>After <TT
+CLASS="FUNCTION"
+>SDL_SemWait()</TT
+> is successful, the semaphore
+can be released and its count atomically incremented by a successful call to
+<A
+HREF="sdlsempost.html"
+>SDL_SemPost</A
+>.</P
+></DIV
+><DIV
+CLASS="REFSECT1"
+><A
+NAME="AEN8041"
+></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
+CLASS="REFSECT1"
+><A
+NAME="AEN8046"
+></A
+><H2
+>Examples</H2
+><P
+><PRE
+CLASS="PROGRAMLISTING"
+>if (SDL_SemWait(my_sem) == -1) {
+        return WAIT_FAILED;
+}
+
+...
+
+SDL_SemPost(my_sem);</PRE
+></P
+></DIV
+><DIV
+CLASS="REFSECT1"
+><A
+NAME="AEN8050"
+></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="sdlsemtrywait.html"
+><TT
+CLASS="FUNCTION"
+>SDL_SemTryWait</TT
+></A
+>,
+<A
+HREF="sdlsemwaittimeout.html"
+><TT
+CLASS="FUNCTION"
+>SDL_SemWaitTimeout</TT
+></A
+>,
+<A
+HREF="sdlsempost.html"
+><TT
+CLASS="FUNCTION"
+>SDL_SemPost</TT
+></A
+>,
+<A
+HREF="sdlsemvalue.html"
+><TT
+CLASS="FUNCTION"
+>SDL_SemValue</TT
+></A
+></P
+></DIV
+><DIV
+CLASS="NAVFOOTER"
+><HR
+ALIGN="LEFT"
+WIDTH="100%"><TABLE
+SUMMARY="Footer navigation table"
+WIDTH="100%"
+BORDER="0"
+CELLPADDING="0"
+CELLSPACING="0"
+><TR
+><TD
+WIDTH="33%"
+ALIGN="left"
+VALIGN="top"
+><A
+HREF="sdldestroysemaphore.html"
+ACCESSKEY="P"
+>Prev</A
+></TD
+><TD
+WIDTH="34%"
+ALIGN="center"
+VALIGN="top"
+><A
+HREF="index.html"
+ACCESSKEY="H"
+>Home</A
+></TD
+><TD
+WIDTH="33%"
+ALIGN="right"
+VALIGN="top"
+><A
+HREF="sdlsemtrywait.html"
+ACCESSKEY="N"
+>Next</A
+></TD
+></TR
+><TR
+><TD
+WIDTH="33%"
+ALIGN="left"
+VALIGN="top"
+>SDL_DestroySemaphore</TD
+><TD
+WIDTH="34%"
+ALIGN="center"
+VALIGN="top"
+><A
+HREF="thread.html"
+ACCESSKEY="U"
+>Up</A
+></TD
+><TD
+WIDTH="33%"
+ALIGN="right"
+VALIGN="top"
+>SDL_SemTryWait</TD
+></TR
+></TABLE
+></DIV
+></BODY
+></HTML
+>
+\ No newline at end of file