<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >sem_get</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="Manual do PHP" HREF="index.html"><LINK REL="UP" TITLE="Semaphore, Shared Memory and IPC Functions" HREF="ref.sem.html"><LINK REL="PREVIOUS" TITLE="sem_acquire" HREF="function.sem-acquire.html"><LINK REL="NEXT" TITLE="sem_release" HREF="function.sem-release.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=UTF-8"></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" >Manual do PHP</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="function.sem-acquire.html" ACCESSKEY="P" >Anterior</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.sem-release.html" ACCESSKEY="N" >Próxima</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.sem-get" ></A >sem_get</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN201153" ></A ><P > (PHP 3 >= 3.0.6, PHP 4, PHP 5)</P >sem_get -- Get a semaphore id</DIV ><DIV CLASS="refsect1" ><A NAME="AEN201156" ></A ><H2 >Description</H2 >resource <B CLASS="methodname" >sem_get</B > ( int key [, int max_acquire [, int perm [, int auto_release]]] )<BR ></BR ><P > <B CLASS="function" >sem_get()</B > returns an id that can be used to access the System V semaphore with the given <CODE CLASS="parameter" >key</CODE >. The semaphore is created if necessary using the permission bits specified in <CODE CLASS="parameter" >perm</CODE > (defaults to 0666). The number of processes that can acquire the semaphore simultaneously is set to <CODE CLASS="parameter" >max_acquire</CODE > (defaults to 1). Actually this value is set only if the process finds it is the only process currently attached to the semaphore. </P ><P > Optional parameter <CODE CLASS="parameter" >auto_release</CODE > specifies if the semaphore should be automatically released on request shutdown. It is available since PHP 4.3.0. </P ><P > Returns a positive semaphore identifier on success, or <TT CLASS="constant" ><B >FALSE</B ></TT > on error. </P ><P > A second call to <B CLASS="function" >sem_get()</B > for the same key will return a different semaphore identifier, but both identifiers access the same underlying semaphore. </P ><P > See also <A HREF="function.sem-acquire.html" ><B CLASS="function" >sem_acquire()</B ></A >, <A HREF="function.sem-release.html" ><B CLASS="function" >sem_release()</B ></A >, and <A HREF="function.ftok.html" ><B CLASS="function" >ftok()</B ></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="function.sem-acquire.html" ACCESSKEY="P" >Anterior</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Principal</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.sem-release.html" ACCESSKEY="N" >Próxima</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >sem_acquire</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.sem.html" ACCESSKEY="U" >Acima</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >sem_release</TD ></TR ></TABLE ></DIV ></BODY ></HTML >