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Import BSDDB 4.7.25 (as of svn r89086)

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Zachary Ware
2017-09-04 13:40:25 -05:00
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<!--$Id: mempfile_class.html 63573 2008-05-23 21:43:21Z trent.nelson $-->
<!--Copyright (c) 1997,2008 Oracle. All rights reserved.-->
<!--See the file LICENSE for redistribution information.-->
<html>
<head>
<title>Berkeley DB: DbMpoolFile</title>
<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
<meta name="keywords" content="embedded,database,programmatic,toolkit,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++">
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<body bgcolor=white>
<table width="100%"><tr valign=top>
<td>
<b>DbMpoolFile</b>
</td>
<td align=right>
<a href="../api_cxx/api_core.html"><img src="../images/api.gif" alt="API"></a>
<a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a></td>
</tr></table>
<hr size=1 noshade>
<tt>
<b><pre>
#include &lt;db_cxx.h&gt;
<p>
class DbMpoolFile {
public:
DB_MPOOLFILE *DbMpoolFile::get_DB_MPOOLFILE();
const DB_MPOOLFILE *DbMpoolFile::get_const_DB_MPOOLFILE() const;
...
};
</pre></b>
<hr size=1 noshade>
<b>Description: DbMpoolFile</b>
<p>The memory pool interfaces for the Berkeley DB database environment are
methods of the <a href="../api_cxx/env_class.html">DbEnv</a> handle. The <a href="../api_cxx/env_class.html">DbEnv</a> memory pool
methods and the DbMpoolFile class provide general-purpose,
page-oriented buffer management of files. Although designed to work
with the other <a href="../api_cxx/db_class.html">Db</a> classes, they are also useful for more general
purposes. The memory pools are referred to in this document as simply
<i>pools</i>.</p>
<p>Pools may be shared between processes. Pools are usually filled by
pages from one or more files. Pages in the pool are replaced in LRU
(least-recently-used) order, with each new page replacing the page that
has been unused the longest. Pages retrieved from the pool using
<a href="../api_cxx/memp_fget.html">DbMpoolFile::get</a> are <i>pinned</i> in the pool until they are
returned to the control of the buffer pool using the <a href="../api_cxx/memp_fput.html">DbMpoolFile::put</a>
method.</p>
<p>The DbMpoolFile object is the handle for a file in the memory
pool. The handle is not free-threaded. Once the <a href="../api_cxx/memp_fclose.html">DbMpoolFile::close</a> method
is called, the handle may not be accessed again, regardless of that
method's return.</p>
<p>Each DbMpoolFile object has an associated DB_MPOOLFILE
structure, which is used by the underlying implementation of Berkeley DB and
its C-language API. The DbMpoolFile::get_DB_MPOOLFILE method returns a
pointer to this struct. Given a const DbMpoolFile object,
DbMpoolFile::get_const_DB_MPOOLFILE returns a const pointer to the same
struct.</p>
<p>These methods may be useful for Berkeley DB applications including both C
and C++ language software. It should not be necessary to use these
calls in a purely C++ application.</p>
<hr size=1 noshade>
<br><b>Class</b>
<a href="../api_cxx/env_class.html">DbEnv</a>, DbMpoolFile
<br><b>See Also</b>
<a href="../api_cxx/memp_list.html">Memory Pools and Related Methods</a>
</tt>
<table width="100%"><tr><td><br></td><td align=right>
<a href="../api_cxx/api_core.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
</td></tr></table>
<p><font size=1>Copyright (c) 1996,2008 Oracle. All rights reserved.</font>
</body>
</html>