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<title>Berkeley DB: DbMpoolFile::set</title>
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<h1>DbMpoolFile::set</h1>
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<h3><pre>
#include <db_cxx.h>
<p>
int
DbMpoolFile::set(void *pgaddr, u_int32_t flags);
</pre></h3>
<h1>Description</h1>
<p>The DbMpoolFile::set method sets the flags associated with the page to which
<b>pgaddr</b> refers without unpinning it from the pool. The
<b>pgaddr</b> argument must be an address previously returned by
<a href="../api_cxx/memp_fget.html">DbMpoolFile::get</a>.
<p>The <b>flags</b> value must be set to 0 or by bitwise inclusively <b>OR</b>'ing together one or
more of the following values:
<p><dl compact>
<p><dt><a name="DB_MPOOL_CLEAN">DB_MPOOL_CLEAN</a><dd>Clear any previously set modification information (that is, don't bother
writing the page back to the source file).
<p><dt><a name="DB_MPOOL_DIRTY">DB_MPOOL_DIRTY</a><dd>The page has been modified and must be written to the source file before
being evicted from the pool.
<p><dt><a name="DB_MPOOL_DISCARD">DB_MPOOL_DISCARD</a><dd>The page is unlikely to be useful in the near future, and should be
discarded before other pages in the pool.
</dl>
<p>The DB_MPOOL_CLEAN and DB_MPOOL_DIRTY flags are
mutually exclusive.
<p>The DbMpoolFile::set 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 DbMpoolFile::set 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 DbMpoolFile::set 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::set method may fail and
either return <a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a> or throw a
<a href="../api_cxx/runrec_class.html">DbRunRecoveryException</a>,
in which case all subsequent Berkeley DB calls will fail in the same way.
<h1>Class</h1>
<a href="../api_cxx/env_class.html">DbEnv</a>, <a href="../api_cxx/mempfile_class.html">DbMpoolFile</a>
<h1>See Also</h1>
<a href="../api_cxx/memp_list.html">Memory Pools and Related Methods</a>
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