<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>memp_XXX</title> <link rel="stylesheet" href="gettingStarted.css" type="text/css" /> <meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /> <link rel="start" href="index.html" title="Berkeley DB Upgrade Guide" /> <link rel="up" href="upgrade_4_0_toc.html" title="Chapter 10. Upgrading Berkeley DB 3.3 applications to Berkeley DB 4.0" /> <link rel="prev" href="upgrade_4_0_log.html" title="log_XXX" /> <link rel="next" href="upgrade_4_0_txn.html" title="txn_XXX" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">memp_XXX</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="upgrade_4_0_log.html">Prev</a> </td> <th width="60%" align="center">Chapter 10. Upgrading Berkeley DB 3.3 applications to Berkeley DB 4.0</th> <td width="20%" align="right"> <a accesskey="n" href="upgrade_4_0_txn.html">Next</a></td> </tr> </table> <hr /> </div> <div class="sect1" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h2 class="title" style="clear: both"><a id="upgrade_4_0_mp"></a>memp_XXX</h2> </div> </div> </div> <p>The C API for the Berkeley DB Memory Pool subsystem was reworked in the 4.0 release as follows:</p> <div class="informaltable"> <table border="1" width="80%"> <colgroup> <col /> <col /> </colgroup> <thead> <tr> <th>Historic functional interface</th> <th>Berkeley DB 4.X method</th> </tr> </thead> <tbody> <tr> <td>memp_register</td> <td> <a href="../api_reference/C/mempregister.html" class="olink">DB_ENV->memp_register()</a> </td> </tr> <tr> <td>memp_stat</td> <td> <a href="../api_reference/C/mempstat.html" class="olink">DB_ENV->memp_stat()</a> </td> </tr> <tr> <td>memp_sync</td> <td> <a href="../api_reference/C/mempsync.html" class="olink">DB_ENV->memp_sync()</a> </td> </tr> <tr> <td>memp_trickle</td> <td> <a href="../api_reference/C/memptrickle.html" class="olink">DB_ENV->memp_trickle()</a> </td> </tr> <tr> <td>memp_fopen</td> <td> <a href="../api_reference/C/mempfcreate.html" class="olink">DB_ENV->memp_fcreate()</a> </td> </tr> <tr> <td>DB_MPOOL_FINFO: ftype</td> <td> <a href="../api_reference/C/mempset_ftype.html" class="olink">DB_MPOOLFILE->set_ftype()</a> </td> </tr> <tr> <td>DB_MPOOL_FINFO: pgcookie</td> <td> <a href="../api_reference/C/mempset_pgcookie.html" class="olink">DB_MPOOLFILE->set_pgcookie()</a> </td> </tr> <tr> <td>DB_MPOOL_FINFO: fileid</td> <td> <a href="../api_reference/C/mempset_fileid.html" class="olink">DB_MPOOLFILE->set_fileid()</a> </td> </tr> <tr> <td>DB_MPOOL_FINFO: lsn_offset</td> <td> <a href="../api_reference/C/mempset_lsn_offset.html" class="olink">DB_MPOOLFILE->set_lsn_offset()</a> </td> </tr> <tr> <td>DB_MPOOL_FINFO: clear_len</td> <td> <a href="../api_reference/C/mempset_clear_len.html" class="olink">DB_MPOOLFILE->set_clear_len()</a> </td> </tr> <tr> <td>memp_fopen</td> <td> <a href="../api_reference/C/mempfopen.html" class="olink">DB_MPOOLFILE->open()</a> </td> </tr> <tr> <td>memp_fclose</td> <td> <a href="../api_reference/C/mempfclose.html" class="olink">DB_MPOOLFILE->close()</a> </td> </tr> <tr> <td>memp_fput</td> <td> <a href="../api_reference/C/mempput.html" class="olink">DB_MPOOLFILE->put()</a> </td> </tr> <tr> <td>memp_fset</td> <td>DB_MPOOLFILE->set</td> </tr> <tr> <td>memp_fsync</td> <td> <a href="../api_reference/C/mempfsync.html" class="olink">DB_MPOOLFILE->sync()</a> </td> </tr> </tbody> </table> </div> <p>Applications calling any of the memp_register, memp_stat, memp_sync or memp_trickle functions should update those calls to use the enclosing <a href="../api_reference/C/env.html" class="olink">DB_ENV class</a> handle's method (easily done as the first argument to the existing call is the correct <a href="../api_reference/C/env.html" class="olink">DB_ENV class</a> handle).</p> <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 release to take a flags argument. To leave their historic behavior unchanged, applications should add a final argument of 0 to any calls made to <a href="../api_reference/C/mempstat.html" class="olink">DB_ENV->memp_stat()</a>.</p> <p>Applications calling the memp_fopen function should update those calls as follows: First, acquire a <a href="../api_reference/C/memp.html" class="olink">Cache chapter</a> handle using the <a href="../api_reference/C/mempfcreate.html" class="olink">DB_ENV->memp_fcreate()</a> method. Second, if the DB_MPOOL_FINFO structure reference passed to the memp_fopen function was non-NULL, call the <a href="../api_reference/C/memp.html" class="olink">Cache chapter</a> method corresponding to each initialized field in the DB_MPOOL_FINFO structure. Third, call the <a href="../api_reference/C/mempfopen.html" class="olink">DB_MPOOLFILE->open()</a> method method to open the underlying file. If the <a href="../api_reference/C/mempfopen.html" class="olink">DB_MPOOLFILE->open()</a> method call fails, then <a href="../api_reference/C/mempfclose.html" class="olink">DB_MPOOLFILE->close()</a> method must be called to destroy the allocated handle.</p> <p>Applications calling the memp_fopen, memp_fclose, memp_fput, memp_fset, or memp_fsync functions should update those calls to use the enclosing <a href="../api_reference/C/memp.html" class="olink">Cache chapter</a> handle's method. Again, this is easily done as the first argument to the existing call is the correct <a href="../api_reference/C/memp.html" class="olink">Cache chapter</a> handle. With one exception, the calling conventions of the old and new interfaces are identical; the one exception is the <a href="../api_reference/C/mempfclose.html" class="olink">DB_MPOOLFILE->close()</a> method, which requires an additional flag parameter that should be set to 0.</p> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="upgrade_4_0_log.html">Prev</a> </td> <td width="20%" align="center"> <a accesskey="u" href="upgrade_4_0_toc.html">Up</a> </td> <td width="40%" align="right"> <a accesskey="n" href="upgrade_4_0_txn.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">log_XXX </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> txn_XXX</td> </tr> </table> </div> </body> </html>