1<!--$Id: memp_trickle.so,v 10.36 2004/08/13 03:38:58 bostic Exp $--> 2<!--Copyright (c) 1997,2008 Oracle. All rights reserved.--> 3<!--See the file LICENSE for redistribution information.--> 4<html> 5<head> 6<title>Berkeley DB: DB_ENV->memp_trickle</title> 7<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> 8<meta name="keywords" content="embedded,database,programmatic,toolkit,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++"> 9</head> 10<body bgcolor=white> 11<table width="100%"><tr valign=top> 12<td> 13<b>DB_ENV->memp_trickle</b> 14</td> 15<td align=right> 16<a href="../api_c/api_core.html"><img src="../images/api.gif" alt="API"></a> 17<a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a></td> 18</tr></table> 19<hr size=1 noshade> 20<tt> 21<b><pre> 22#include <db.h> 23<p> 24int 25DB_ENV->memp_trickle(DB_ENV *env, int percent, int *nwrotep); 26</pre></b> 27<hr size=1 noshade> 28<b>Description: DB_ENV->memp_trickle</b> 29<p>The DB_ENV->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->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->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->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> 58</tt> 59<table width="100%"><tr><td><br></td><td align=right> 60<a href="../api_c/api_core.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a> 61</td></tr></table> 62<p><font size=1>Copyright (c) 1996,2008 Oracle. All rights reserved.</font> 63</body> 64</html> 65