1<?xml version="1.0" encoding="UTF-8" standalone="no"?> 2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 3<html xmlns="http://www.w3.org/1999/xhtml"> 4 <head> 5 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> 6 <title>DbEnv::get_mp_max_write()</title> 7 <link rel="stylesheet" href="apiReference.css" type="text/css" /> 8 <meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /> 9 <link rel="start" href="index.html" title="Berkeley DB C++ API Reference" /> 10 <link rel="up" href="memp.html" title="Chapter 9. The DbMpoolFile Handle" /> 11 <link rel="prev" href="mempget_mp_max_openfd.html" title="DbEnv::get_mp_max_openfd()" /> 12 <link rel="next" href="envget_mp_mmapsize.html" title="DbEnv::get_mp_mmapsize()" /> 13 </head> 14 <body> 15 <div class="navheader"> 16 <table width="100%" summary="Navigation header"> 17 <tr> 18 <th colspan="3" align="center">DbEnv::get_mp_max_write()</th> 19 </tr> 20 <tr> 21 <td width="20%" align="left"><a accesskey="p" href="mempget_mp_max_openfd.html">Prev</a> </td> 22 <th width="60%" align="center">Chapter 9. 23 The DbMpoolFile Handle 24 </th> 25 <td width="20%" align="right"> <a accesskey="n" href="envget_mp_mmapsize.html">Next</a></td> 26 </tr> 27 </table> 28 <hr /> 29 </div> 30 <div class="sect1" lang="en" xml:lang="en"> 31 <div class="titlepage"> 32 <div> 33 <div> 34 <h2 class="title" style="clear: both"><a id="mempget_mp_max_write"></a>DbEnv::get_mp_max_write()</h2> 35 </div> 36 </div> 37 </div> 38 <pre class="programlisting">#include <db_cxx.h> 39 40int 41DbEnv::get_mp_max_write(int *maxwritep, db_timeout_t *maxwrite_sleepp);</pre> 42 <p> 43 The <code class="methodname">DbEnv::get_mp_max_write()</code> method returns the current maximum 44 number of sequential write operations and microseconds to pause that the library can schedule when flushing 45 dirty pages from the cache. These values are set by the 46 <a class="xref" href="mempset_mp_max_write.html" title="DbEnv::set_mp_max_write()">DbEnv::set_mp_max_write()</a> 47 method. 48 </p> 49 <p> 50 The <code class="methodname">DbEnv::get_mp_max_write()</code> method may be called at any time 51 during the life of the application. 52 </p> 53 <p> 54 The <code class="methodname">DbEnv::get_mp_max_write()</code> <span> 55 56 <span> 57 method either returns a non-zero error value or throws an 58 exception that encapsulates a non-zero error value on 59 failure, and returns 0 on success. 60 </span> 61 </span> 62 </p> 63 <div class="sect2" lang="en" xml:lang="en"> 64 <div class="titlepage"> 65 <div> 66 <div> 67 <h3 class="title"><a id="id1690195"></a>Parameters</h3> 68 </div> 69 </div> 70 </div> 71 <div class="sect3" lang="en" xml:lang="en"> 72 <div class="titlepage"> 73 <div> 74 <div> 75 <h4 class="title"><a id="id1690098"></a>maxwritep</h4> 76 </div> 77 </div> 78 </div> 79 <p> 80 The <span class="bold"><strong>maxwritep</strong></span> parameter references 81 memory into which the maximum number of sequential write operations 82 is copied. 83 </p> 84 </div> 85 <div class="sect3" lang="en" xml:lang="en"> 86 <div class="titlepage"> 87 <div> 88 <div> 89 <h4 class="title"><a id="id1690142"></a>maxwrite_sleepp</h4> 90 </div> 91 </div> 92 </div> 93 <p> 94 The <span class="bold"><strong>maxwrite_sleepp</strong></span> parameter 95 references memory into which the microseconds to pause before 96 scheduling further write operations is copied. 97 </p> 98 </div> 99 </div> 100 <div class="sect2" lang="en" xml:lang="en"> 101 <div class="titlepage"> 102 <div> 103 <div> 104 <h3 class="title"><a id="id1690393"></a>Class</h3> 105 </div> 106 </div> 107 </div> 108 <p> 109 <a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a>, <a class="link" href="memp.html" title="Chapter 9. The DbMpoolFile Handle">DbMpoolFile</a> 110 </p> 111 </div> 112 <div class="sect2" lang="en" xml:lang="en"> 113 <div class="titlepage"> 114 <div> 115 <div> 116 <h3 class="title"><a id="id1690085"></a>See Also</h3> 117 </div> 118 </div> 119 </div> 120 <p> 121 <a class="xref" href="memp.html#memplist" title="Memory Pools and Related Methods">Memory Pools and Related Methods</a>, 122 <a class="xref" href="mempset_mp_max_write.html" title="DbEnv::set_mp_max_write()">DbEnv::set_mp_max_write()</a> 123 </p> 124 </div> 125 </div> 126 <div class="navfooter"> 127 <hr /> 128 <table width="100%" summary="Navigation footer"> 129 <tr> 130 <td width="40%" align="left"><a accesskey="p" href="mempget_mp_max_openfd.html">Prev</a> </td> 131 <td width="20%" align="center"> 132 <a accesskey="u" href="memp.html">Up</a> 133 </td> 134 <td width="40%" align="right"> <a accesskey="n" href="envget_mp_mmapsize.html">Next</a></td> 135 </tr> 136 <tr> 137 <td width="40%" align="left" valign="top">DbEnv::get_mp_max_openfd() </td> 138 <td width="20%" align="center"> 139 <a accesskey="h" href="index.html">Home</a> 140 </td> 141 <td width="40%" align="right" valign="top"> DbEnv::get_mp_mmapsize()</td> 142 </tr> 143 </table> 144 </div> 145 </body> 146</html> 147