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<h1>DbEnv::memp_trickle</h1>
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<h3><pre>
#include <db_cxx.h>
<p>
int
DbEnv::memp_trickle(int pct, int *nwrotep);
</pre></h3>
<h1>Description</h1>
<p>The DbEnv::memp_trickle method ensures that at least <b>pct</b> percent of
the pages in the shared memory pool are clean by writing dirty pages to
their backing files.
If the <b>nwrotep</b> argument is non-NULL, the number of pages that
were written to reach the correct percentage is returned in the memory
location it references.
<p>The purpose of the DbEnv::memp_trickle function is to enable a memory
pool manager to ensure that a page is always available for reading in new
information without having to wait for a write.
<p>The DbEnv::memp_trickle 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.
<h1>Errors</h1>
<p>The DbEnv::memp_trickle method may fail and throw an exception or return a non-zero error for the following conditions:
<p><dl compact>
<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
</dl>
<p>The DbEnv::memp_trickle 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 DbEnv::memp_trickle 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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