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<!--$Id: memp_fset.so,v 10.30 2004/08/13 03:38:58 bostic Exp $-->
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<title>Berkeley DB: DB_MPOOLFILE->set</title>
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<h3>DB_MPOOLFILE->set</h3>
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<h3><pre>
#include <db.h>
<p>
int
DB_MPOOLFILE->set(DB_MPOOLFILE *mpf, void *pgaddr, u_int32_t flags);
</pre></h3>
<hr size=1 noshade>
<h3>Description: DB_MPOOLFILE->set</h3>
<p>The DB_MPOOLFILE->set method sets the attributes of a cache page.</p>
<p>The DB_MPOOLFILE->set method
returns a non-zero error value on failure
and 0 on success.
</p>
<h3>Parameters</h3>
<dl compact>
<dt><b>pgaddr</b><dd>The <b>pgaddr</b> parameter is the address of the page for which
attributes are to be set. he <b>pgaddr</b> parameter must be an
address previously returned by <a href="../api_c/memp_fget.html">DB_MPOOLFILE->get</a>.
<dt><b>flags</b><dd>The <b>flags</b> parameter must be set to 0 or by bitwise inclusively <b>OR</b>'ing together one
or more of the following values:
<dl compact>
<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).
<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.
<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>
</dl>
<h3>Errors</h3>
<p>The DB_MPOOLFILE->set method
may fail and return one of the following non-zero errors:</p>
<dl compact>
<dt>EINVAL<dd>An
invalid flag value or parameter was specified.
</dl>
<hr size=1 noshade>
<h3>Class</h3>
<a href="../api_c/env_class.html">DB_ENV</a>, <a href="../api_c/mempfile_class.html">DB_MPOOLFILE</a>
<h3>See Also</h3>
<a href="../api_c/memp_list.html">Memory Pools and Related Methods</a>
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