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<pre class="programlisting">#include <db.h>
int
DB_ENV->memp_sync(DB_ENV *env, DB_LSN *lsn); </pre>
<p>
The <code class="methodname">DB_ENV->memp_sync()</code> method flushes modified pages in the cache to
their backing files.
</p>
<p>
Pages in the cache that cannot be immediately written back to disk (for
example, pages that are currently in use by another thread of control)
are waited for and written to disk as soon as it is possible to do so.
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<p>
The <code class="methodname">DB_ENV->memp_sync()</code> <span>
<span>
method returns a non-zero error value on failure and 0 on success.
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<h3 class="title"><a id="id1687800"></a>Parameters</h3>
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<h4 class="title"><a id="id1687613"></a>lsn</h4>
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<p>
The purpose of the <span class="bold"><strong>lsn</strong></span> parameter is
to enable a transaction manager to ensure, as part of a checkpoint,
that all pages modified by a certain time have been written to disk.
</p>
<p>
All modified pages with a a log sequence number
(<a class="link" href="lsn.html" title="Chapter 7. The DB_LSN Handle">DB_LSN</a>) less than the <span class="bold"><strong>lsn</strong></span> parameter are written to disk. If
<span class="bold"><strong>lsn</strong></span> is NULL, all modified pages in
the cache are written to disk.
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<a class="link" href="env.html" title="Chapter 5. The DB_ENV Handle">DB_ENV</a>, <a class="link" href="memp.html" title="Chapter 8. The DB_MPOOLFILE Handle">DB_MPOOLFILE</a>
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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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