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<html><head><title>Win32::Mutex (Perl in a Nutshell, 2nd Edition)</title><link rel="stylesheet" type="text/css" href="../style/style1.css" /><meta name="DC.Creator" content="Stephen Spainhour" /><meta name="DC.Format" content="text/xml" scheme="MIME" /><meta name="DC.Language" content="en-US" /><meta name="DC.Publisher" content="O'Reilly & Associates, Inc." /><meta name="DC.Source" scheme="ISBN" content="0596002416L" /><meta name="DC.Subject.Keyword" content="stuff" /><meta name="DC.Title" content="Perl in a Nutshell, 2nd Edition" /><meta name="DC.Type" content="Text.Monograph" /></head><body bgcolor="#ffffff"><img src="gifs/smbanner.gif" usemap="#banner-map" border="0" alt="Book Home" /><map name="banner-map"><area shape="rect" coords="1,-2,616,66" href="index.htm" alt="Java and XSLT" /><area shape="rect" coords="629,-11,726,25" href="jobjects/fsearch.htm" alt="Search this book" /></map><div class="navbar"><table width="684" border="0"><tr><td align="left" valign="top" width="228"><a href="ch22_08.htm"><img src="../gifs/txtpreva.gif" alt="Previous" border="0" /></a></td><td align="center" valign="top" width="228" /><td align="right" valign="top" width="228"><a href="ch22_10.htm"><img src="../gifs/txtnexta.gif" alt="Next" border="0" /></a></td></tr></table></div><h2 class="sect1">22.9. Win32::Mutex</h2><p><a name="INDEX-3294" /><a name="INDEX-3295" />This module provides access to Win32mutex objects, which control access to common resources. The<tt class="literal">new</tt> constructor creates the mutex and determinesits initial availability. It has the following syntax:</p><blockquote><pre class="code">$mut = Win32::Mutex->new(<em class="replaceable"><tt>init</em>, [<em class="replaceable">name</tt></em>]);</pre></blockquote><p>The first argument determines the initial status of the mutex. If<em class="replaceable"><tt>init</tt></em> is nonzero, the calling process hasimmediate ownership of the mutex object. A <tt class="literal">0</tt> valuemeans that the mutex is available. The second argument assigns a nameto the mutex that allows this object to be referenced by others viathe <tt class="literal">open</tt> function.</p><p><a name="INDEX-3296" />Another object constructor forWin32::Mutex is <tt class="literal">open</tt>:</p><blockquote><pre class="code">$mut = Win32::Mutex->open(<em class="replaceable"><tt>name</tt></em>);</pre></blockquote><p>This call creates a new mutex object to access an existing mutexidentified by <em class="replaceable"><tt>name</tt></em>.</p><p>The following methods can be used on Win32::Mutex objects.</p><a name="INDEX-3297" /><div class="refentry"><table width="515" border="0" cellpadding="5"><tr><td align="left"><font size="+1"><b>release</b></font></td><td align="right"><i></i></td></tr></table><hr width="515" size="3" noshade="true" align="left" color="black" /><pre>$<em class="replaceable">mut</em>->Release( )</pre><p><a name="INDEX-3297" />Releases ownership of the mutex fromthe calling process, allowing anyone waiting on the mutex to takeownership.</p></div><a name="INDEX-3298" /><a name="INDEX-3299" /><div class="refentry"><table width="515" border="0" cellpadding="5"><tr><td align="left"><font size="+1"><b>wait</b></font></td><td align="right"><i></i></td></tr></table><hr width="515" size="3" noshade="true" align="left" color="black" /><pre>$<em class="replaceable">mut</em>->wait([<em class="replaceable">timeout</em>])</pre><p><a name="INDEX-3298" />The Win32::IPC method inherited by thismodule. Makes the calling process wait for ownership of the mutexobject for the number of milliseconds specified by<em class="replaceable"><tt>timeout</tt></em>. If the mutexdoesn't become available before the timeout, thecall returns <tt class="literal">0</tt>.<a name="INDEX-3299" /> </p></div><hr width="684" align="left" /><div class="navbar"><table width="684" border="0"><tr><td align="left" valign="top" width="228"><a href="ch22_08.htm"><img src="../gifs/txtpreva.gif" alt="Previous" border="0" /></a></td><td align="center" valign="top" width="228"><a href="index.htm"><img src="../gifs/txthome.gif" alt="Home" border="0" /></a></td><td align="right" valign="top" width="228"><a href="ch22_10.htm"><img src="../gifs/txtnexta.gif" alt="Next" border="0" /></a></td></tr><tr><td align="left" valign="top" width="228">22.8. Win32::IPC</td><td align="center" valign="top" width="228"><a href="index/index.htm"><img src="../gifs/index.gif" alt="Book Index" border="0" /></a></td><td align="right" valign="top" width="228">22.10. Win32::NetAdmin</td></tr></table></div><hr width="684" align="left" /><img src="../gifs/navbar.gif" usemap="#library-map" border="0" alt="Library Navigation Links" /><p><p><font size="-1"><a href="copyrght.htm">Copyright © 2002</a> O'Reilly & Associates. 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