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<!--$Id: memp_set_lsn_offset.so,v 10.17 2005/04/14 17:57:54 bostic Exp $-->
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<title>Berkeley DB: DB_MPOOLFILE->set_lsn_offset</title>
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<h3>DB_MPOOLFILE->set_lsn_offset</h3>
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<h3><pre>
#include <db.h>
<p>
int
DB_MPOOLFILE->set_lsn_offset(DB_MPOOLFILE *mpf, int32_t lsn_offset);
<p>
int
DB_MPOOLFILE->get_lsn_offset(DB_MPOOLFILE *mpf, int32_t *lsn_offsetp);
</pre></h3>
<hr size=1 noshade>
<h3>Description: DB_MPOOLFILE->set_lsn_offset</h3>
<p>The DB_MPOOLFILE->set_lsn_offset method specifies the zero-based byte offset
of a log sequence number (<a href="../api_c/lsn_class.html">DB_LSN</a>) on the file's pages, for the
purposes of page-flushing as part of transaction checkpoint. (See the
<a href="../api_c/memp_sync.html">DB_ENV->memp_sync</a> documentation for more information.)</p>
<p>The DB_MPOOLFILE->set_lsn_offset method configures a file in the memory pool, not only
operations performed using the specified <a href="../api_c/mempfile_class.html">DB_MPOOLFILE</a> handle.</p>
<p>The DB_MPOOLFILE->set_lsn_offset method may not be called after the <a href="../api_c/memp_fopen.html">DB_MPOOLFILE->open</a> method is
called.
If the file is already open in the memory pool when
<a href="../api_c/memp_fopen.html">DB_MPOOLFILE->open</a> is called, the information specified to DB_MPOOLFILE->set_lsn_offset
must be consistent with the existing file or an error will be
returned.
</p>
<p>The DB_MPOOLFILE->set_lsn_offset method
returns a non-zero error value on failure
and 0 on success.
</p>
<h3>Parameters</h3>
<dl compact>
<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: DB_MPOOLFILE->get_lsn_offset</h3>
<p>The DB_MPOOLFILE->get_lsn_offset method returns the log sequence number byte offset.</p>
<p>The DB_MPOOLFILE->get_lsn_offset method may be called at any time during the life of the
application.</p>
<p>The DB_MPOOLFILE->get_lsn_offset method
returns a non-zero error value on failure
and 0 on success.
</p>
<h3>Parameters</h3>
<dl compact>
<dt><b>lsn_offsetp</b><dd>The DB_MPOOLFILE->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="../api_c/env_class.html">DB_ENV</a>, <a href="../api_c/mempfile_class.html">DB_MPOOLFILE</a>
<h3>See Also</h3>
<a href="../api_c/memp_list.html">Memory Pools and Related Methods</a>
</tt>
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