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>DB_ENV->memp_fcreate()</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 8. The DB_MPOOLFILE Handle" /> 11 <link rel="prev" href="envget_mp_mmapsize.html" title="DB_ENV->get_mp_mmapsize()" /> 12 <link rel="next" href="mempregister.html" title="DB_ENV->memp_register()" /> 13 </head> 14 <body> 15 <div class="navheader"> 16 <table width="100%" summary="Navigation header"> 17 <tr> 18 <th colspan="3" align="center">DB_ENV->memp_fcreate()</th> 19 </tr> 20 <tr> 21 <td width="20%" align="left"><a accesskey="p" href="envget_mp_mmapsize.html">Prev</a> </td> 22 <th width="60%" align="center">Chapter 8. 23 The DB_MPOOLFILE Handle 24 </th> 25 <td width="20%" align="right"> <a accesskey="n" href="mempregister.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="mempfcreate"></a>DB_ENV->memp_fcreate()</h2> 35 </div> 36 </div> 37 </div> 38 <pre class="programlisting">#include <db.h> 39 40int 41DB_ENV->memp_fcreate(DB_ENV *dbenvp, DB_MPOOLFILE **dbmfp, u_int32_t flags); </pre> 42 <p> 43 The <code class="methodname">DB_ENV->memp_fcreate()</code> method creates a 44 <a class="link" href="memp.html" title="Chapter 8. The DB_MPOOLFILE Handle">DB_MPOOLFILE</a> structure that is the handle for a Berkeley DB 45 cache (that is, a shared memory buffer pool file). A pointer to this structure is returned in the memory to 46 which <span class="bold"><strong>dbmfp</strong></span> refers. Calling the 47 <a class="xref" href="mempfclose.html" title="DB_MPOOLFILE->close()">DB_MPOOLFILE->close()</a> method will discard the returned handle. 48 </p> 49 <p> 50 The <code class="methodname">DB_ENV->memp_fcreate()</code> <span> 51 <span> 52 method returns a non-zero error value on failure and 0 on success. 53 </span> 54 55 </span> 56 </p> 57 <div class="sect2" lang="en" xml:lang="en"> 58 <div class="titlepage"> 59 <div> 60 <div> 61 <h3 class="title"><a id="id1686020"></a>Parameters</h3> 62 </div> 63 </div> 64 </div> 65 <div class="sect3" lang="en" xml:lang="en"> 66 <div class="titlepage"> 67 <div> 68 <div> 69 <h4 class="title"><a id="id1686261"></a>dbmfp</h4> 70 </div> 71 </div> 72 </div> 73 <p> 74 The <code class="methodname">DB_ENV->memp_fcreate()</code> 75 method returns a pointer to a mpool structure in 76 <span class="bold"><strong>dbmfp</strong></span>. 77 </p> 78 </div> 79 <div class="sect3" lang="en" xml:lang="en"> 80 <div class="titlepage"> 81 <div> 82 <div> 83 <h4 class="title"><a id="id1686118"></a>flags</h4> 84 </div> 85 </div> 86 </div> 87 <p> 88 The <span class="bold"><strong>flags</strong></span> parameter is currently 89 unused, and must be set to 0. 90 </p> 91 </div> 92 </div> 93 <div class="sect2" lang="en" xml:lang="en"> 94 <div class="titlepage"> 95 <div> 96 <div> 97 <h3 class="title"><a id="id1686425"></a>Class</h3> 98 </div> 99 </div> 100 </div> 101 <p> 102 <a class="link" href="env.html" title="Chapter 5. The DB_ENV Handle">DB_ENV</a>, <a class="link" href="memp.html" title="Chapter 8. The DB_MPOOLFILE Handle">DB_MPOOLFILE</a> 103 </p> 104 </div> 105 <div class="sect2" lang="en" xml:lang="en"> 106 <div class="titlepage"> 107 <div> 108 <div> 109 <h3 class="title"><a id="id1685642"></a>See Also</h3> 110 </div> 111 </div> 112 </div> 113 <p> 114 <a class="xref" href="memp.html#memplist" title="Memory Pools and Related Methods">Memory Pools and Related Methods</a> 115 </p> 116 </div> 117 </div> 118 <div class="navfooter"> 119 <hr /> 120 <table width="100%" summary="Navigation footer"> 121 <tr> 122 <td width="40%" align="left"><a accesskey="p" href="envget_mp_mmapsize.html">Prev</a> </td> 123 <td width="20%" align="center"> 124 <a accesskey="u" href="memp.html">Up</a> 125 </td> 126 <td width="40%" align="right"> <a accesskey="n" href="mempregister.html">Next</a></td> 127 </tr> 128 <tr> 129 <td width="40%" align="left" valign="top">DB_ENV->get_mp_mmapsize() </td> 130 <td width="20%" align="center"> 131 <a accesskey="h" href="index.html">Home</a> 132 </td> 133 <td width="40%" align="right" valign="top"> DB_ENV->memp_register()</td> 134 </tr> 135 </table> 136 </div> 137 </body> 138</html> 139