2011-09-13 17:44:24 +00:00
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<title>DbTxn::set_timeout()</title>
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<link rel="up" href="txn.html" title="Chapter 13. The DbTxn Handle" />
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<p>Library Version 11.2.5.2</p>
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<table width="100%" summary="Navigation header">
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<th colspan="3" align="center">DbTxn::set_timeout()</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="txnset_priority.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 13.
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The DbTxn Handle
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="utilities.html">Next</a></td>
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<h2 class="title" style="clear: both"><a id="txnset_timeout"></a>DbTxn::set_timeout()</h2>
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</div>
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</div>
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<pre class="programlisting">#include <db_cxx.h>
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u_int32_t
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DbTxn::set_timeout(db_timeout_t timeout, u_int32_t flags);</pre>
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<p>
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The <code class="methodname">DbTxn::set_timeout()</code> method sets timeout values for locks or
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transactions for the specified transaction.
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</p>
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<p>
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Timeouts are checked whenever a thread of control blocks on a lock or
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when deadlock detection is performed. In the case of
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<code class="literal">DB_SET_LOCK_TIMEOUT</code>, the timeout is for any single lock request. In
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the case of <code class="literal">DB_SET_TXN_TIMEOUT</code>, the timeout is for the life of the
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transaction. As timeouts are only checked when the lock request first
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blocks or when deadlock detection is performed, the accuracy of the
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timeout depends on how often deadlock detection is performed.
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</p>
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<p>
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Timeout values may be specified for the database environment as a
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whole. Also, the database environment must enable the locking
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subsystem before timeout values can be specified. See
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<a class="xref" href="envset_timeout.html" title="DbEnv::set_timeout()">DbEnv::set_timeout()</a>
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for more information.
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</p>
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<p>
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The <code class="methodname">DbTxn::set_timeout()</code> method configures operations performed on
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the underlying transaction, not only operations performed using the
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specified <a class="link" href="txn.html" title="Chapter 13. The DbTxn Handle">DbTxn</a> handle.
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</p>
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<p>
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The <code class="methodname">DbTxn::set_timeout()</code> method may be called at any time during the
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life of the application.
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</p>
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<p>
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The <code class="methodname">DbTxn::set_timeout()</code> <span>
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<span>
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method either returns a non-zero error value or throws an
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exception that encapsulates a non-zero error value on
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failure, and returns 0 on success.
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</span>
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</span>
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</p>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3655704"></a>Parameters</h3>
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</div>
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</div>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h4 class="title"><a id="id3655693"></a>timeout</h4>
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</div>
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</div>
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</div>
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<p>
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The <span class="bold"><strong>timeout</strong></span> parameter is specified as
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an unsigned 32-bit number of microseconds, limiting the maximum
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timeout to roughly 71 minutes. A value of 0 disables timeouts for the
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transaction.
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</p>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h4 class="title"><a id="id3655329"></a>flags</h4>
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</div>
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</div>
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</div>
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<p>
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The <span class="bold"><strong>flags</strong></span> parameter must be set to
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one of the following values:
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</p>
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<div class="itemizedlist">
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<ul type="disc">
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<li>
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<p>
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<code class="literal">DB_SET_LOCK_TIMEOUT</code>
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</p>
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<p>
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Set the timeout value for locks in this transaction.
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</p>
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</li>
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<li>
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<p>
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<code class="literal">DB_SET_TXN_TIMEOUT</code>
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</p>
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<p>
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Set the timeout value for this transaction.
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</p>
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</li>
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</ul>
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</div>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3655602"></a>Errors</h3>
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</div>
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</div>
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</div>
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<p>
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The <code class="methodname">DbTxn::set_timeout()</code> <span>
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<span>
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method may fail and throw a <a class="link" href="dbexception.html" title="Chapter 6. The DbException Class">DbException</a>
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exception, encapsulating one of the following non-zero errors, or return one
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of the following non-zero errors:
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</span>
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</span>
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</p>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h4 class="title"><a id="id3656004"></a>EINVAL</h4>
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</div>
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</div>
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</div>
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<p>
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An invalid flag value or parameter was specified.
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</p>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3655982"></a>Class</h3>
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</div>
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</div>
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</div>
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<p>
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<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>
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</p>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3655905"></a>See Also</h3>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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</div>
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<p>
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<a class="xref" href="txn.html#txnlist" title="Transaction Subsystem and Related Methods">Transaction Subsystem and Related Methods</a>
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</p>
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<td width="40%" align="left"><a accesskey="p" href="txnset_priority.html">Prev</a> </td>
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<a accesskey="u" href="txn.html">Up</a>
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<td width="40%" align="right"> <a accesskey="n" href="utilities.html">Next</a></td>
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<td width="40%" align="left" valign="top">DbTxn::set_priority() </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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<td width="40%" align="right" valign="top"> Appendix A.
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Berkeley DB Command Line Utilities
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