2011-09-13 17:44:24 +00:00
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>EAGAIN</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB Upgrade Guide" />
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<link rel="up" href="upgrade_3_0_toc.html" title="Chapter 14. Upgrading Berkeley DB 2.X applications to Berkeley DB 3.0" />
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<link rel="prev" href="upgrade_3_0_lock_notheld.html" title="DB_LOCK_NOTHELD" />
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<link rel="next" href="upgrade_3_0_eacces.html" title="EACCES" />
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<div class="libver">
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2012-11-14 21:35:20 +00:00
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<p>Library Version 11.2.5.3</p>
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2011-09-13 17:44:24 +00:00
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">EAGAIN</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="upgrade_3_0_lock_notheld.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 14. Upgrading Berkeley DB 2.X applications to Berkeley DB 3.0</th>
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<td width="20%" align="right"> <a accesskey="n" href="upgrade_3_0_eacces.html">Next</a></td>
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</tr>
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<hr />
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</div>
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="upgrade_3_0_eagain"></a>EAGAIN</h2>
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</div>
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</div>
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</div>
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<p>Historically, the Berkeley DB interfaces have returned the POSIX error value
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EAGAIN to indicate a deadlock. This has been removed from the Berkeley DB 3.0
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release in order to make it possible for applications to distinguish
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between EAGAIN errors returned by the system and returns from Berkeley DB
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indicating deadlock.</p>
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<p>The application should be searched for any occurrences of EAGAIN. For
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each of these, any that are checking for a deadlock return from Berkeley DB
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should be changed to check for the DB_LOCK_DEADLOCK return value.</p>
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<p>If, for any reason, this is a difficult change for the application to
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make, the <code class="filename">include/db.src</code> distribution file should be modified to
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translate all returns of DB_LOCK_DEADLOCK to EAGAIN. Search for the
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string EAGAIN in that file, there is a comment that describes how to make
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the change.</p>
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</div>
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<hr />
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="upgrade_3_0_lock_notheld.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="upgrade_3_0_toc.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="upgrade_3_0_eacces.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">DB_LOCK_NOTHELD </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top"> EACCES</td>
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</tr>
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