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<h1>memp_fput</h1>
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<h3><pre>
#include <db.h>
<p>
int
memp_fput(DB_MPOOLFILE *mpf, void *pgaddr, u_int32_t flags);
</pre></h3>
<h1>Description</h1>
<p>The memp_fput function indicates that the page referenced by
<b>pgaddr</b> can be evicted from the pool. The <b>pgaddr</b>
argument must be an address previously returned by <a href="../api_c/memp_fget.html">memp_fget</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 (i.e., 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 memp_fput function returns a non-zero error value on failure and 0 on success.
<h1>Errors</h1>
<p>The memp_fput function may fail and return a non-zero error for the following conditions:
<p><dl compact>
<p><dt>EACCES<dd>The DB_MPOOL_DIRTY flag was set and the source file was not opened for
writing.
</dl>
<p><dl compact>
<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
<p>The <b>pgaddr</b> parameter does not reference a page returned by
<a href="../api_c/memp_fget.html">memp_fget</a>.
<p>More than one of DB_MPOOL_CLEAN and DB_MPOOL_DIRTY flags was set.
</dl>
<p>The memp_fput function may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions.
If a catastrophic error has occurred, the memp_fput function may fail and return
<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.
<h1>See Also</h1>
<a href="../api_c/env_set_mp_mmapsize.html">DBENV->set_mp_mmapsize</a>,
<a href="../api_c/memp_fclose.html">memp_fclose</a>,
<a href="../api_c/memp_fget.html">memp_fget</a>,
<a href="../api_c/memp_fopen.html">memp_fopen</a>,
<a href="../api_c/memp_fput.html">memp_fput</a>,
<a href="../api_c/memp_fset.html">memp_fset</a>,
<a href="../api_c/memp_fsync.html">memp_fsync</a>,
<a href="../api_c/memp_register.html">memp_register</a>,
<a href="../api_c/memp_stat.html">memp_stat</a>,
<a href="../api_c/memp_sync.html">memp_sync</a>
and
<a href="../api_c/memp_trickle.html">memp_trickle</a>.
</tt>
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