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6<title>Berkeley DB: DB_ENV-&gt;memp_trickle</title>
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13<b>DB_ENV-&gt;memp_trickle</b>
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21<b><pre>
22#include &lt;db.h&gt;
23<p>
24int
25DB_ENV-&gt;memp_trickle(DB_ENV *env, int percent, int *nwrotep);
26</pre></b>
27<hr size=1 noshade>
28<b>Description: DB_ENV-&gt;memp_trickle</b>
29<p>The DB_ENV-&gt;memp_trickle method ensures that a specified percent of the pages
30in the shared memory pool are clean, by writing dirty pages to their
31backing files.</p>
32<p>The purpose of the DB_ENV-&gt;memp_trickle function is to enable a memory
33pool manager to ensure that a page is always available for reading in new
34information without having to wait for a write.</p>
35<p>The DB_ENV-&gt;memp_trickle method
36returns a non-zero error value on failure
37and 0 on success.
38</p>
39<b>Parameters</b> <br>
40 <b>nwrotep</b><ul compact><li>The <b>nwrotep</b> parameter references memory into which
41 the number of pages written to reach the specified
42percentage is copied.</ul> 
43 <b>percent</b><ul compact><li>The <b>percent</b> parameter is the percent of the pages in the cache
44that should be clean.</ul>
45<br>
46<br><b>Errors</b>
47<p>The DB_ENV-&gt;memp_trickle method
48may fail and return one of the following non-zero errors:</p>
49<br>
50<b>EINVAL</b><ul compact><li>An
51invalid flag value or parameter was specified.</ul>
52<br>
53<hr size=1 noshade>
54<br><b>Class</b>
55<a href="../api_c/env_class.html">DB_ENV</a>, <a href="../api_c/mempfile_class.html">DB_MPOOLFILE</a>
56<br><b>See Also</b>
57<a href="../api_c/memp_list.html">Memory Pools and Related Methods</a>
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