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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html> <head> <link rel="STYLESHEET" href="modpython.css" type='text/css'> <link rel="first" href="modpython.html" title='Mod_python Manual'> <link rel='contents' href='contents.html' title="Contents"> <link rel='index' href='genindex.html' title='Index'> <link rel='last' href='about.html' title='About this document...'> <link rel='help' href='about.html' title='About this document...'> <LINK REL="next" href="pyapi-psp.html"> <LINK REL="prev" href="pyapi-cookie.html"> <LINK REL="parent" href="pythonapi.html"> <LINK REL="next" href="pyapi-sess-classes.html"> <meta name='aesop' content='information'> <META NAME="description" CONTENT="Session - Session Management"> <META NAME="keywords" CONTENT="modpython"> <META NAME="resource-type" CONTENT="document"> <META NAME="distribution" CONTENT="global"> <title>4.8 Session - Session Management</title> </head> <body> <DIV CLASS="navigation"> <table align="center" width="100%" cellpadding="0" cellspacing="2"> <tr> <td><a rel="prev" title="4.7.3 Examples" href="pyapi-cookie-example.html"><img src='previous.gif' border='0' height='32' alt='Previous Page' width='32'></A></td> <td><a rel="parent" title="4. Python API" href="pythonapi.html"><img src='up.gif' border='0' height='32' alt='Up One Level' width='32'></A></td> <td><a rel="next" title="4.8.1 Classes" href="pyapi-sess-classes.html"><img src='next.gif' border='0' height='32' alt='Next Page' width='32'></A></td> <td align="center" width="100%">Mod_python Manual</td> <td><a rel="contents" title="Table of Contents" href="contents.html"><img src='contents.gif' border='0' height='32' alt='Contents' width='32'></A></td> <td><img src='blank.gif' border='0' height='32' alt='' width='32'></td> <td><a rel="index" title="Index" href="genindex.html"><img src='index.gif' border='0' height='32' alt='Index' width='32'></A></td> </tr></table> <b class="navlabel">Previous:</b> <a class="sectref" rel="prev" href="pyapi-cookie-example.html">4.7.3 Examples</A> <b class="navlabel">Up:</b> <a class="sectref" rel="parent" href="pythonapi.html">4. Python API</A> <b class="navlabel">Next:</b> <a class="sectref" rel="next" href="pyapi-sess-classes.html">4.8.1 Classes</A> <br><hr> </DIV> <!--End of Navigation Panel--> <H1><A NAME="SECTION006800000000000000000"> </A> <BR> 4.8 <tt class="module">Session</tt> - Session Management </H1> <P> The <tt class="module">Session</tt> module provides objects for maintaining persistent sessions across requests. <P> The module contains a <tt class="class">BaseSession</tt> class, which is not meant to be used directly (it provides no means of storing a session), <tt class="class">DbmSession</tt> class, which uses a dbm to store sessions, and <tt class="class">FileSession</tt> class, which uses individual files to store sessions. <P> The <tt class="class">BaseSession</tt> class also provides session locking, both across processes and threads. For locking it uses APR global_mutexes (a number of them is pre-created at startup) The mutex number is computed by using modulus of the session id <tt class="function">hash()</tt>. (Therefore it's possible that different session id's will have the same hash, but the only implication is that those two sessions cannot be locked at the same time resulting in a slight delay.) <P> <p><hr> <!--Table of Child-Links--> <A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></a> <UL CLASS="ChildLinks"> <LI><A href="pyapi-sess-classes.html">4.8.1 Classes</a> <LI><A href="pyapi-sess-example.html">4.8.2 Examples</a> </ul> <!--End of Table of Child-Links--> <DIV CLASS="navigation"> <p><hr> <table align="center" width="100%" cellpadding="0" cellspacing="2"> <tr> <td><a rel="prev" title="4.7.3 Examples" rel="prev" title="4.7.3 Examples" href="pyapi-cookie-example.html"><img src='previous.gif' border='0' height='32' alt='Previous Page' width='32'></A></td> <td><a rel="parent" title="4. Python API" rel="parent" title="4. Python API" href="pythonapi.html"><img src='up.gif' border='0' height='32' alt='Up One Level' width='32'></A></td> <td><a rel="next" title="4.8.1 Classes" rel="next" title="4.8.1 Classes" href="pyapi-sess-classes.html"><img src='next.gif' border='0' height='32' alt='Next Page' width='32'></A></td> <td align="center" width="100%">Mod_python Manual</td> <td><a rel="contents" title="Table of Contents" rel="contents" title="Table of Contents" href="contents.html"><img src='contents.gif' border='0' height='32' alt='Contents' width='32'></A></td> <td><img src='blank.gif' border='0' height='32' alt='' width='32'></td> <td><a rel="index" title="Index" rel="index" title="Index" href="genindex.html"><img src='index.gif' border='0' height='32' alt='Index' width='32'></A></td> </tr></table> <b class="navlabel">Previous:</b> <a class="sectref" rel="prev" href="pyapi-cookie-example.html">4.7.3 Examples</A> <b class="navlabel">Up:</b> <a class="sectref" rel="parent" href="pythonapi.html">4. Python API</A> <b class="navlabel">Next:</b> <a class="sectref" rel="next" href="pyapi-sess-classes.html">4.8.1 Classes</A> <hr> <span class="release-info">Release 3.2.8, documentation updated on February 19, 2006.</span> </DIV> <!--End of Navigation Panel--> </BODY> </HTML>