<?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>DbTxn::set_priority()</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="txn.html" title="Chapter 13. The DbTxn Handle" /> <link rel="prev" href="txnset_name.html" title="DbTxn::set_name()" /> <link rel="next" href="txnset_timeout.html" title="DbTxn::set_timeout()" /> </head> <body> <div xmlns="" class="navheader"> <div class="libver"> <p>Library Version 11.2.5.3</p> </div> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">DbTxn::set_priority()</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="txnset_name.html">Prev</a> </td> <th width="60%" align="center">Chapter 13. The DbTxn Handle </th> <td width="20%" align="right"> <a accesskey="n" href="txnset_timeout.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="txnset_priority"></a>DbTxn::set_priority()</h2> </div> </div> </div> <pre class="programlisting">#include <db_cxx.h> int DbTxn::set_priority(u_int32_t priority);</pre> <p> The <code class="methodname">DbTxn::set_priority()</code> method sets the priority for the transaction. The deadlock detector will reject lock requests from lower priority transactions before those from higher priority transactions. </p> <p> By default, all transactions are created with a priority of 100. </p> <p> The <code class="methodname">DbTxn::set_priority()</code> method may be called at any time during the life of the transaction. </p> <p> The <code class="methodname">DbTxn::set_priority()</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="idp10519840"></a>Parameters</h3> </div> </div> </div> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h4 class="title"><a id="idp10519192"></a>priority</h4> </div> </div> </div> <p> The <span class="bold"><strong>priority</strong></span> parameter must be a value between 0 and 2^32-1. </p> </div> </div> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="idp10512680"></a>Errors</h3> </div> </div> </div> <p> The <code class="methodname">DbTxn::set_priority()</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="idp10527904"></a>EINVAL</h4> </div> </div> </div> <p> An invalid flag value or parameter was specified. </p> </div> </div> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="idp10526608"></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="txn.html" title="Chapter 13. The DbTxn Handle">DbTxn</a> </p> </div> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="idp10529232"></a>See Also</h3> </div> </div> </div> <p> <a class="xref" href="txn.html#txnlist" title="Transaction Subsystem and Related Methods">Transaction 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="txnset_name.html">Prev</a> </td> <td width="20%" align="center"> <a accesskey="u" href="txn.html">Up</a> </td> <td width="40%" align="right"> <a accesskey="n" href="txnset_timeout.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">DbTxn::set_name() </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> DbTxn::set_timeout()</td> </tr> </table> </div> </body> </html>