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6<title>Berkeley DB: DbEnv::memp_sync</title>
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13<b>DbEnv::memp_sync</b>
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21<b><pre>
22#include &lt;db_cxx.h&gt;
23<p>
24int
25DbEnv::memp_sync(DbLsn *lsn);
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28<b>Description: DbEnv::memp_sync</b>
29<p>The DbEnv::memp_sync method flushes modified pages in the cache to their
30backing files.</p>
31<p>Pages in the pool that cannot be immediately written back to disk (for
32example, pages that are currently in use by another thread of control)
33are waited for and written to disk as soon as it is possible to do
34so.</p>
35<p>The DbEnv::memp_sync method
36either returns a non-zero error value
37or throws an exception that encapsulates a non-zero error value on
38failure, and returns 0 on success.
39</p>
40<b>Parameters</b> <br>
41 <b>lsn</b><ul compact><li>The purpose of the <b>lsn</b> parameter is to enable a transaction
42manager to ensure, as part of a checkpoint, that all pages modified by
43a certain time have been written to disk.
44<p>All modified pages with a a log sequence number (<a href="../api_cxx/lsn_class.html">DbLsn</a>) less
45than the <b>lsn</b> parameter are written to disk.  If <b>lsn</b> is
46NULL, all modified pages in the pool are written to disk.</p></ul>
47<br>
48<hr size=1 noshade>
49<br><b>Class</b>
50<a href="../api_cxx/env_class.html">DbEnv</a>, <a href="../api_cxx/mempfile_class.html">DbMpoolFile</a>
51<br><b>See Also</b>
52<a href="../api_cxx/memp_list.html">Memory Pools and Related Methods</a>
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