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111 lines
4.6 KiB
HTML
111 lines
4.6 KiB
HTML
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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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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>function arguments</title>
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<link rel="stylesheet" href="gettingStarted.css" type="text/css" />
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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_envopen.html" title="environment open/close/unlink" />
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<link rel="next" href="upgrade_3_0_dbenv.html" title="DB_ENV structure" />
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</head>
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 11.2.5.2</p>
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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">function arguments</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_envopen.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_dbenv.html">Next</a></td>
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</tr>
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</table>
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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_func"></a>function arguments</h2>
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</div>
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</div>
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</div>
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<p>In Berkeley DB 3.0, there are no longer separate structures that represent
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each subsystem (for example, DB_LOCKTAB or DB_TXNMGR), and an overall
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<a href="../api_reference/C/env.html" class="olink">DB_ENV</a> environment structure. Instead there is only the
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<a href="../api_reference/C/env.html" class="olink">DB_ENV</a> references
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should be passed around by your application instead of passing around
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DB_LOCKTAB or DB_TXNMGR references.</p>
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<p>Each of the following functions:</p>
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<pre class="programlisting">lock_detect
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lock_get
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lock_id
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lock_put
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lock_stat
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lock_vec</pre>
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<p>should have its first argument, a reference to the DB_LOCKTAB structure,
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replaced with a reference to the enclosing <a href="../api_reference/C/env.html" class="olink">DB_ENV</a> structure. For
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example, the following line of code from a Berkeley DB 2.X application:</p>
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<pre class="programlisting">DB_LOCKTAB *lt;
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DB_LOCK lock;
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ret = lock_put(lt, lock);</pre>
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<p>should now be written as follows:</p>
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<pre class="programlisting">DB_ENV *dbenv;
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DB_LOCK *lock;
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ret = lock_put(dbenv, lock);</pre>
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<p>Similarly, all of the functions:</p>
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<pre class="programlisting">log_archive
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log_compare
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log_file
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log_flush
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log_get
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log_put
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log_register
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log_stat
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log_unregister</pre>
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<p>should have their DB_LOG argument replaced with a reference to a
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<a href="../api_reference/C/env.html" class="olink">DB_ENV</a> structure, and the functions:</p>
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<pre class="programlisting">memp_fopen
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memp_register
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memp_stat
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memp_sync
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memp_trickle</pre>
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<p>should have their DB_MPOOL argument replaced with a reference to a
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<a href="../api_reference/C/env.html" class="olink">DB_ENV</a> structure.</p>
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<p>You should remove all references to DB_LOCKTAB, DB_LOG, DB_MPOOL, and
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DB_TXNMGR structures from your application, they are no longer useful
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in any way. In fact, a simple way to identify all of the places that
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need to be upgraded is to remove all such structures and variables
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they declare, and then compile. You will see a warning message from
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your compiler in each case that needs to be upgraded.</p>
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</div>
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<div class="navfooter">
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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_envopen.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_dbenv.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">environment open/close/unlink </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"> DB_ENV structure</td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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