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<h1>DbMpoolFile::sync</h1>
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#include &lt;db_cxx.h&gt;
<p>
int
DbMpoolFile::sync();
</pre></h3>
<h1>Description</h1>
<p>The DbMpoolFile::sync method writes all pages associated with the
<a href="../api_cxx/mempfile_class.html">DbMpoolFile</a>, that were marked as modified using <a href="../api_cxx/memp_fput.html">DbMpoolFile::put</a>
or <a href="../api_cxx/memp_fset.html">DbMpoolFile::set</a>, back to the source file.  If any of the modified
pages are also <i>pinned</i> (i.e., currently referenced by this or
another process) DbMpoolFile::sync will ignore them.
<p>The DbMpoolFile::sync method either returns a non-zero error value or throws an exception that
encapsulates a non-zero error value on failure, 0 on success, and returns <a href="../api_c/memp_fsync.html#DB_INCOMPLETE">DB_INCOMPLETE</a> if there were pages which were
modified but which DbMpoolFile::sync was unable to write immediately.
<h1>Errors</h1>
<p>The DbMpoolFile::sync method may fail and throw an exception or return a non-zero error for errors specified for other Berkeley DB and C library or system methods.
If a catastrophic error has occurred, the DbMpoolFile::sync method may fail and either
return <a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a> or throw an exception encapsulating
<a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a>, in which case all subsequent Berkeley DB calls will fail
in the same way.
<h3>Classes</h3>
<a href="../api_cxx/dbenv_class.html">DbEnv</a>, <a href="../api_cxx/mempfile_class.html">DbMpoolFile</a>
<h1>See Also</h1>
<a href="../api_cxx/env_set_mp_mmapsize.html">DbEnv::set_mp_mmapsize</a>,
<a href="../api_cxx/memp_fclose.html">DbMpoolFile::close</a>,
<a href="../api_cxx/memp_fget.html">DbMpoolFile::get</a>,
<a href="../api_cxx/memp_fopen.html">DbMpoolFile::open</a>,
<a href="../api_cxx/memp_fput.html">DbMpoolFile::put</a>,
<a href="../api_cxx/memp_fset.html">DbMpoolFile::set</a>,
<a href="../api_cxx/memp_fsync.html">DbMpoolFile::sync</a>,
<a href="../api_cxx/memp_register.html">DbEnv::memp_register</a>,
<a href="../api_cxx/memp_stat.html">DbEnv::memp_stat</a>,
<a href="../api_cxx/memp_sync.html">DbEnv::memp_sync</a>
and
<a href="../api_cxx/memp_trickle.html">DbEnv::memp_trickle</a>.
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