<!--$Id: memp_set_lsn_offset.so,v 10.14 2003/11/08 19:17:41 bostic Exp $--> <!--Copyright 1997-2003 by Sleepycat Software, Inc.--> <!--All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB: DbMpoolFile::set_lsn_offset</title> <meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> <meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++"> </head> <body bgcolor=white> <a name="2"><!--meow--></a> <table width="100%"><tr valign=top> <td> <h3>DbMpoolFile::set_lsn_offset</h3> </td> <td align=right> <a href="../../db42-devel-4.2.52/api_cxx/api_index.html"><img src="../../db42-4.2.52/images/api.gif" alt="API"></a> <a href="../../db42-devel-4.2.52/ref/toc.html"><img src="../../db42-4.2.52/images/ref.gif" alt="Ref"></a> </td></tr></table> <hr size=1 noshade> <tt> <h3><pre> #include <db_cxx.h> <p> int DbMpoolFile::set(int32_t lsn_offset); <p> int DbMpoolFile::get_lsn_offset(int32_t *lsn_offsetp); </pre></h3> <hr size=1 noshade> <h3>Description: DbMpoolFile::set_lsn_offset</h3> <a name="3"><!--meow--></a> <p>The DbMpoolFile::set_lsn_offset method specifies the zero-based byte offset of a log sequence number (<a href="../../db42-devel-4.2.52/api_cxx/lsn_class.html">DbLsn</a>) on the file's pages, for the purposes of page-flushing as part of transaction checkpoint. (See the <a href="../../db42-devel-4.2.52/api_cxx/memp_sync.html">DbEnv::memp_sync</a> documentation for more information.)</p> <p>The DbMpoolFile::set_lsn_offset method configures a file in the memory pool, not only operations performed using the specified <a href="../../db42-devel-4.2.52/api_cxx/mempfile_class.html">DbMpoolFile</a> handle.</p> <p>The DbMpoolFile::set_lsn_offset method may not be called after the <a href="../../db42-devel-4.2.52/api_cxx/memp_fopen.html">DbMpoolFile::open</a> method is called. If the file is already open in the memory pool when <a href="../../db42-devel-4.2.52/api_cxx/memp_fopen.html">DbMpoolFile::open</a> is called, the information specified to DbMpoolFile::set_lsn_offset must be consistent with the existing file or an error will be returned. </p> <p>The DbMpoolFile::set_lsn_offset method either returns a non-zero error value or throws an exception that encapsulates a non-zero error value on failure, and returns 0 on success. </p> <h3>Parameters</h3> <p><dl compact> <p><dt><b>lsn_offset</b><dd> The <b>lsn_offset</b> parameter is the zero-based byte offset of the log sequence number on the file's pages. </dl> <hr size=1 noshade> <h3>Description: DbMpoolFile::get_lsn_offset</h3> <p>The DbMpoolFile::get_lsn_offset method returns the log sequence number byte offset.</p> <p>The DbMpoolFile::get_lsn_offset method may be called at any time during the life of the application.</p> <p>The DbMpoolFile::get_lsn_offset method either returns a non-zero error value or throws an exception that encapsulates a non-zero error value on failure, and returns 0 on success. </p> <h3>Parameters</h3> <p><dl compact> <p><dt><b>lsn_offsetp</b><dd> The DbMpoolFile::get_lsn_offset method returns the log sequence number byte offset in <b>lsn_offsetp</b>. </dl> <hr size=1 noshade> <h3>Class</h3> <a href="../../db42-devel-4.2.52/api_cxx/env_class.html">DbEnv</a>, <a href="../../db42-devel-4.2.52/api_cxx/mempfile_class.html">DbMpoolFile</a> <h3>See Also</h3> <a href="../../db42-devel-4.2.52/api_cxx/memp_list.html">Memory Pools and Related Methods</a> </tt> <table width="100%"><tr><td><br></td><td align=right> <a href="../../db42-devel-4.2.52/api_cxx/api_index.html"><img src="../../db42-4.2.52/images/api.gif" alt="API"></a><a href="../../db42-devel-4.2.52/ref/toc.html"><img src="../../db42-4.2.52/images/ref.gif" alt="Ref"></a> </td></tr></table> <p><font size=1><a href="../../db42-devel-4.2.52/sleepycat/legal.html">Copyright (c) 1996-2003</a> <a href="http://www.sleepycat.com">Sleepycat Software, Inc.</a> - All rights reserved.</font> </body> </html>
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