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238 lines
8.4 KiB
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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>DbMpoolFile::put()</title>
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<link rel="stylesheet" href="apiReference.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 C++ API Reference" />
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<link rel="up" href="memp.html" title="Chapter 9. The DbMpoolFile Handle" />
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<link rel="prev" href="mempfopen.html" title="DbMpoolFile::open()" />
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<link rel="next" href="mempfsync.html" title="DbMpoolFile::sync()" />
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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">DbMpoolFile::put()</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="mempfopen.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 9.
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The DbMpoolFile Handle
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="mempfsync.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="mempput"></a>DbMpoolFile::put()</h2>
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</div>
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</div>
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</div>
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<pre class="programlisting">#include <db_cxx.h>
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int
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DbMpoolFile::put(void *pgaddr, DB_CACHE_PRIORITY priority,
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u_int32_t flags);</pre>
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<p>
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The <code class="methodname">DbMpoolFile::put()</code> method returns a reference to a page in the
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cache, setting the priority of the page as specified by the <span class="bold"><strong>priority</strong></span> parameter.
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</p>
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<p>
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The <code class="methodname">DbMpoolFile::put()</code> <span>
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<span>
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method either returns a non-zero error value or throws an
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exception that encapsulates a non-zero error value on
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failure, and returns 0 on success.
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</span>
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</span>
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</p>
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<div class="sect2" 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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<h3 class="title"><a id="id3648895"></a>Parameters</h3>
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</div>
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</div>
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</div>
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<div class="sect3" 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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<h4 class="title"><a id="id3648901"></a>pgaddr</h4>
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</div>
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</div>
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</div>
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<p>
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The <span class="bold"><strong>pgaddr</strong></span> parameter is the address
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of the page to be returned to the cache. The <span class="bold"><strong>pgaddr</strong></span> parameter must be a value previously
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returned by the
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<a class="xref" href="mempfget.html" title="DbMpoolFile::get()">DbMpoolFile::get()</a> method.
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</p>
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</div>
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<div class="sect3" 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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<h4 class="title"><a id="id3648829"></a>priority</h4>
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</div>
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</div>
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</div>
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<p>
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Set the page's <span class="bold"><strong>priority</strong></span> as follows:
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</p>
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<div class="itemizedlist">
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<ul type="disc">
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<li>
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<p><a id="fput_DB_PRIORITY_UNCHANGED"></a>
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<code class="literal">DB_PRIORITY_UNCHANGED</code>
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</p>
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<p>
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The priority is unchanged.
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</p>
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</li>
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<li>
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<p>
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<code class="literal">DB_PRIORITY_VERY_LOW</code>
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</p>
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<p>
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The lowest priority: pages are the most likely to be discarded.
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</p>
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</li>
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<li>
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<p>
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<code class="literal">DB_PRIORITY_LOW</code>
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</p>
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<p>
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The next lowest priority.
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</p>
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</li>
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<li>
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<p>
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<code class="literal">DB_PRIORITY_DEFAULT</code>
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</p>
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<p>
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The default priority.
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</p>
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</li>
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<li>
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<p>
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<code class="literal">DB_PRIORITY_HIGH</code>
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</p>
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<p>
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The next highest priority.
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</p>
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</li>
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<li>
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<p>
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<code class="literal">DB_PRIORITY_VERY_HIGH</code>
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</p>
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<p>
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The highest priority: pages are the least likely to be discarded.
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</p>
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</li>
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</ul>
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</div>
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</div>
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<div class="sect3" 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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<h4 class="title"><a id="id3649109"></a>flags</h4>
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</div>
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</div>
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</div>
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<p>
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The <span class="bold"><strong>flags</strong></span> parameter is currently
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unused, and must be set to 0.
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</p>
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</div>
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</div>
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<div class="sect2" 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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<h3 class="title"><a id="id3649131"></a>Errors</h3>
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</div>
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</div>
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</div>
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<p>
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The <code class="methodname">DbMpoolFile::put()</code> <span>
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<span>
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method may fail and throw a <a class="link" href="dbexception.html" title="Chapter 6. The DbException Class">DbException</a>
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exception, encapsulating one of the following non-zero errors, or return one
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of the following non-zero errors:
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</span>
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</span>
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</p>
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<div class="sect3" 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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<h4 class="title"><a id="id3649080"></a>EINVAL</h4>
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</div>
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</div>
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</div>
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<p>
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An invalid flag value or parameter was specified.
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</p>
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</div>
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</div>
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<div class="sect2" 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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<h3 class="title"><a id="id3649015"></a>Class</h3>
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</div>
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</div>
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</div>
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<p>
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<a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a>, <a class="link" href="memp.html" title="Chapter 9. The DbMpoolFile Handle">DbMpoolFile</a>
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</p>
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</div>
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<div class="sect2" 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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<h3 class="title"><a id="id3648965"></a>See Also</h3>
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</div>
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</div>
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</div>
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<p>
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<a class="xref" href="memp.html#memplist" title="Memory Pools and Related Methods">Memory Pools and Related Methods</a>
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</p>
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</div>
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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="mempfopen.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="memp.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="mempfsync.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">DbMpoolFile::open() </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"> DbMpoolFile::sync()</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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