<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>DbEnv::set_lk_conflicts()</title> <link rel="stylesheet" href="apiReference.css" type="text/css" /> <meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /> <link rel="start" href="index.html" title="Berkeley DB C++ API Reference" /> <link rel="up" href="lock.html" title="Chapter 7. The DbLock Handle" /> <link rel="prev" href="envget_lk_partitions.html" title="DbEnv::get_lk_partitions()" /> <link rel="next" href="envset_lk_detect.html" title="DbEnv::set_lk_detect()" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">DbEnv::set_lk_conflicts()</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="envget_lk_partitions.html">Prev</a> </td> <th width="60%" align="center">Chapter 7. The DbLock Handle </th> <td width="20%" align="right"> <a accesskey="n" href="envset_lk_detect.html">Next</a></td> </tr> </table> <hr /> </div> <div class="sect1" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h2 class="title" style="clear: both"><a id="envset_lk_conflicts"></a>DbEnv::set_lk_conflicts()</h2> </div> </div> </div> <pre class="programlisting">#include <db_cxx.h> int DbEnv::set_lk_conflicts(u_int8_t *conflicts, int nmodes); </pre> <p> Set the locking conflicts matrix. </p> <p> If <code class="methodname">DbEnv::set_lk_conflicts()</code> is never called, a standard conflicts array is used; see <a href="../../programmer_reference/lock_stdmode.html" class="olink">Standard Lock Modes</a> for more information. </p> <p> The <code class="methodname">DbEnv::set_lk_conflicts()</code> method configures a database environment, not only operations performed using the specified <a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a> handle. </p> <p> The <code class="methodname">DbEnv::set_lk_conflicts()</code> method may not be called after the <a class="xref" href="envopen.html" title="DbEnv::open()">DbEnv::open()</a> method is called. If the database environment already exists when <a class="xref" href="envopen.html" title="DbEnv::open()">DbEnv::open()</a> is called, the information specified to <code class="methodname">DbEnv::set_lk_conflicts()</code> will be ignored. </p> <p> The <code class="methodname">DbEnv::set_lk_conflicts()</code> <span> <span> method either returns a non-zero error value or throws an exception that encapsulates a non-zero error value on failure, and returns 0 on success. </span> </span> </p> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="id1679468"></a>Parameters</h3> </div> </div> </div> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h4 class="title"><a id="id1679473"></a>conflicts</h4> </div> </div> </div> <p> The <span class="bold"><strong>conflicts</strong></span> parameter is the new locking conflicts matrix. The <span class="bold"><strong>conflicts</strong></span> parameter is an <span class="bold"><strong>nmodes</strong></span> by <span class="bold"><strong>nmodes</strong></span> array. A non-0 value for the array element indicates that requested_mode and held_mode conflict: </p> <pre class="programlisting"> conflicts[requested_mode][held_mode] </pre> <p> The <span class="emphasis"><em>not-granted</em></span> mode must be represented by 0. </p> </div> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h4 class="title"><a id="id1679512"></a>nmodes</h4> </div> </div> </div> <p> The <span class="bold"><strong>nmodes</strong></span> parameter is the size of the lock conflicts matrix. </p> </div> </div> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="id1679510"></a>Errors</h3> </div> </div> </div> <p> The <code class="methodname">DbEnv::set_lk_conflicts()</code> <span> <span> method may fail and throw a <a class="link" href="dbexception.html" title="Chapter 6. The DbException Class">DbException</a> exception, encapsulating one of the following non-zero errors, or return one of the following non-zero errors: </span> </span> </p> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h4 class="title"><a id="id1679390"></a>EINVAL</h4> </div> </div> </div> <p> If the method was called after <a class="xref" href="envopen.html" title="DbEnv::open()">DbEnv::open()</a> was called; or if an invalid flag value or parameter was specified. </p> </div> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h4 class="title"><a id="id1679108"></a>ENOMEM</h4> </div> </div> </div> <p> The conflicts array could not be copied. </p> </div> </div> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="id1679680"></a>Class</h3> </div> </div> </div> <p> <a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a>, <a class="link" href="lock.html" title="Chapter 7. The DbLock Handle">DbLock</a> </p> </div> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="id1679076"></a>See Also</h3> </div> </div> </div> <p> <a class="xref" href="lock.html#locklist" title="Locking Subsystem and Related Methods">Locking Subsystem and Related Methods</a> </p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="envget_lk_partitions.html">Prev</a> </td> <td width="20%" align="center"> <a accesskey="u" href="lock.html">Up</a> </td> <td width="40%" align="right"> <a accesskey="n" href="envset_lk_detect.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">DbEnv::get_lk_partitions() </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> DbEnv::set_lk_detect()</td> </tr> </table> </div> </body> </html>