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191 lines
8.4 KiB
HTML
191 lines
8.4 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>memp_XXX</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_4_0_toc.html" title="Chapter 10. Upgrading Berkeley DB 3.3 applications to Berkeley DB 4.0" />
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<link rel="prev" href="upgrade_4_0_log.html" title="log_XXX" />
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<link rel="next" href="upgrade_4_0_txn.html" title="txn_XXX" />
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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">memp_XXX</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_4_0_log.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 10. Upgrading Berkeley DB 3.3 applications to Berkeley DB 4.0</th>
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<td width="20%" align="right"> <a accesskey="n" href="upgrade_4_0_txn.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_4_0_mp"></a>memp_XXX</h2>
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</div>
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</div>
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</div>
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<p>The C API for the Berkeley DB Memory Pool subsystem was reworked in the 4.0
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release as follows:</p>
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<div class="informaltable">
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<table border="1" width="80%">
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<colgroup>
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<col />
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<col />
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</colgroup>
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<thead>
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<tr>
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<th>Historic functional interface</th>
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<th>Berkeley DB 4.X method</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>memp_register</td>
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<td>
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<a href="../api_reference/C/mempregister.html" class="olink">DB_ENV->memp_register()</a>
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</td>
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</tr>
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<tr>
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<td>memp_stat</td>
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<td>
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<a href="../api_reference/C/mempstat.html" class="olink">DB_ENV->memp_stat()</a>
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</td>
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</tr>
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<tr>
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<td>memp_sync</td>
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<td>
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<a href="../api_reference/C/mempsync.html" class="olink">DB_ENV->memp_sync()</a>
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</td>
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</tr>
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<tr>
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<td>memp_trickle</td>
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<td>
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<a href="../api_reference/C/memptrickle.html" class="olink">DB_ENV->memp_trickle()</a>
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</td>
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</tr>
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<tr>
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<td>memp_fopen</td>
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<td>
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<a href="../api_reference/C/mempfcreate.html" class="olink">DB_ENV->memp_fcreate()</a>
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</td>
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</tr>
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<tr>
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<td>DB_MPOOL_FINFO: ftype</td>
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<td>
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<a href="../api_reference/C/mempset_ftype.html" class="olink">DB_MPOOLFILE->set_ftype()</a>
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</td>
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</tr>
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<tr>
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<td>DB_MPOOL_FINFO: pgcookie</td>
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<td>
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<a href="../api_reference/C/mempset_pgcookie.html" class="olink">DB_MPOOLFILE->set_pgcookie()</a>
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</td>
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</tr>
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<tr>
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<td>DB_MPOOL_FINFO: fileid</td>
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<td>
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<a href="../api_reference/C/mempset_fileid.html" class="olink">DB_MPOOLFILE->set_fileid()</a>
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</td>
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</tr>
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<tr>
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<td>DB_MPOOL_FINFO: lsn_offset</td>
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<td>
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<a href="../api_reference/C/mempset_lsn_offset.html" class="olink">DB_MPOOLFILE->set_lsn_offset()</a>
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</td>
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</tr>
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<tr>
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<td>DB_MPOOL_FINFO: clear_len</td>
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<td>
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<a href="../api_reference/C/mempset_clear_len.html" class="olink">DB_MPOOLFILE->set_clear_len()</a>
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</td>
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</tr>
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<tr>
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<td>memp_fopen</td>
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<td>
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<a href="../api_reference/C/mempfopen.html" class="olink">DB_MPOOLFILE->open()</a>
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</td>
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</tr>
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<tr>
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<td>memp_fclose</td>
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<td>
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<a href="../api_reference/C/mempfclose.html" class="olink">DB_MPOOLFILE->close()</a>
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</td>
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</tr>
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<tr>
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<td>memp_fput</td>
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<td>
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<a href="../api_reference/C/mempput.html" class="olink">DB_MPOOLFILE->put()</a>
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</td>
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</tr>
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<tr>
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<td>memp_fset</td>
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<td>DB_MPOOLFILE->set</td>
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</tr>
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<tr>
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<td>memp_fsync</td>
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<td>
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<a href="../api_reference/C/mempfsync.html" class="olink">DB_MPOOLFILE->sync()</a>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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<p>Applications calling any of the memp_register, memp_stat, memp_sync or
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memp_trickle functions should update those calls to use the enclosing
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<a href="../api_reference/C/env.html" class="olink">DB_ENV class</a> handle's method (easily done as the first argument to the
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existing call is the correct <a href="../api_reference/C/env.html" class="olink">DB_ENV class</a> handle).</p>
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<p>In addition, the <a href="../api_reference/C/mempstat.html" class="olink">DB_ENV->memp_stat()</a> call has been changed in the 4.0
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release to take a flags argument. To leave their historic behavior
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unchanged, applications should add a final argument of 0 to any calls
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made to <a href="../api_reference/C/mempstat.html" class="olink">DB_ENV->memp_stat()</a>.</p>
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<p>Applications calling the memp_fopen function should update those calls
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as follows: First, acquire a <a href="../api_reference/C/memp.html" class="olink">Cache chapter</a> handle using the
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<a href="../api_reference/C/mempfcreate.html" class="olink">DB_ENV->memp_fcreate()</a> method. Second, if the DB_MPOOL_FINFO structure
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reference passed to the memp_fopen function was non-NULL, call the
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<a href="../api_reference/C/memp.html" class="olink">Cache chapter</a> method corresponding to each initialized field in
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the DB_MPOOL_FINFO structure. Third, call the <a href="../api_reference/C/mempfopen.html" class="olink">DB_MPOOLFILE->open()</a> method
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method to open the underlying file. If the <a href="../api_reference/C/mempfopen.html" class="olink">DB_MPOOLFILE->open()</a> method call
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fails, then <a href="../api_reference/C/mempfclose.html" class="olink">DB_MPOOLFILE->close()</a> method must be called to destroy the allocated
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handle.</p>
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<p>Applications calling the memp_fopen, memp_fclose, memp_fput, memp_fset,
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or memp_fsync functions should update those calls to use the enclosing
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<a href="../api_reference/C/memp.html" class="olink">Cache chapter</a> handle's method. Again, this is easily done as the
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first argument to the existing call is the correct <a href="../api_reference/C/memp.html" class="olink">Cache chapter</a>
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handle. With one exception, the calling conventions of the old and new
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interfaces are identical; the one exception is the <a href="../api_reference/C/mempfclose.html" class="olink">DB_MPOOLFILE->close()</a> method,
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which requires an additional flag parameter that should be set to 0.</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_4_0_log.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="upgrade_4_0_toc.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="upgrade_4_0_txn.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">log_XXX </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"> txn_XXX</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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