<HTML ><HEAD ><TITLE >sem_release</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK REL="HOME" TITLE="PHP Manual" HREF="index.html"><LINK REL="UP" TITLE="Semaphore, Shared Memory and IPC Functions" HREF="ref.sem.html"><LINK REL="PREVIOUS" TITLE="sem_get" HREF="function.sem-get.html"><LINK REL="NEXT" TITLE="sem_remove" HREF="function.sem-remove.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=ISO-8859-1"></HEAD ><BODY CLASS="refentry" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >PHP Manual</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="function.sem-get.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.sem-remove.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.sem-release" ></A >sem_release</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN82647" ></A ><P > (PHP 3>= 3.0.6, PHP 4 )</P >sem_release -- Release a semaphore</DIV ><DIV CLASS="refsect1" ><A NAME="AEN82650" ></A ><H2 >Description</H2 >bool <B CLASS="methodname" >sem_release</B > ( int sem_identifier)<BR ></BR ><P > Returns: <TT CLASS="constant" ><B >TRUE</B ></TT > on success, <TT CLASS="constant" ><B >FALSE</B ></TT > on error. </P ><P > <B CLASS="function" >sem_release()</B > releases the semaphore if it is currently acquired by the calling process, otherwise a warning is generated. </P ><P > After releasing the semaphore, <A HREF="function.sem-acquire.html" ><B CLASS="function" >sem_acquire()</B ></A > may be called to re-acquire it. </P ><P > See also: <A HREF="function.sem-get.html" ><B CLASS="function" >sem_get()</B ></A > and <A HREF="function.sem-acquire.html" ><B CLASS="function" >sem_acquire()</B ></A >. </P ><DIV CLASS="note" ><BLOCKQUOTE CLASS="note" ><P ><B >Note: </B > This function does not work on Windows systems. </P ></BLOCKQUOTE ></DIV ></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="function.sem-get.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="function.sem-remove.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >sem_get</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.sem.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >sem_remove</TD ></TR ></TABLE ></DIV ></BODY ></HTML >