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: DbEnv::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>DbEnv::memp_trickle</b> 14</td> 15<td align=right> 16<a href="../api_cxx/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_cxx.h> 23<p> 24int 25DbEnv::memp_trickle(int percent, int *nwrotep); 26</pre></b> 27<hr size=1 noshade> 28<b>Description: DbEnv::memp_trickle</b> 29<p>The DbEnv::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 DbEnv::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 DbEnv::memp_trickle method 36either returns a non-zero error value 37or throws an exception that encapsulates a non-zero error value on 38failure, and returns 0 on success. 39</p> 40<b>Parameters</b> <br> 41 <b>nwrotep</b><ul compact><li>The <b>nwrotep</b> parameter references memory into which 42 the number of pages written to reach the specified 43percentage is copied.</ul> 44 <b>percent</b><ul compact><li>The <b>percent</b> parameter is the percent of the pages in the cache 45that should be clean.</ul> 46<br> 47<br><b>Errors</b> 48<p>The DbEnv::memp_trickle method 49may fail and throw 50<a href="../api_cxx/except_class.html">DbException</a>, 51encapsulating one of the following non-zero errors, or return one of 52the following non-zero errors:</p> 53<br> 54<b>EINVAL</b><ul compact><li>An 55invalid flag value or parameter was specified.</ul> 56<br> 57<hr size=1 noshade> 58<br><b>Class</b> 59<a href="../api_cxx/env_class.html">DbEnv</a>, <a href="../api_cxx/mempfile_class.html">DbMpoolFile</a> 60<br><b>See Also</b> 61<a href="../api_cxx/memp_list.html">Memory Pools and Related Methods</a> 62</tt> 63<table width="100%"><tr><td><br></td><td align=right> 64<a href="../api_cxx/api_core.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a> 65</td></tr></table> 66<p><font size=1>Copyright (c) 1996,2008 Oracle. All rights reserved.</font> 67</body> 68</html> 69