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HTML
169 lines
8.2 KiB
HTML
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>DbLockNotGrantedException</title>
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<link rel="stylesheet" href="apiReference.css" type="text/css" />
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB C++ API Reference" />
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<link rel="up" href="dbexception.html" title="Chapter 6. The DbException Class" />
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<link rel="prev" href="dbdeadlock.html" title="DbDeadlockException" />
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<link rel="next" href="dbmemory.html" title="DbMemoryException" />
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</head>
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 11.2.5.2</p>
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">DbLockNotGrantedException</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="dbdeadlock.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 6. The DbException Class</th>
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<td width="20%" align="right"> <a accesskey="n" href="dbmemory.html">Next</a></td>
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</tr>
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</table>
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<hr />
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</div>
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<div class="sect1" 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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<h2 class="title" style="clear: both"><a id="dblocknotgranted"></a>DbLockNotGrantedException</h2>
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</div>
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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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class DbLockNotGrantedException : public DbException {
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public:
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db_lockop_t get_op() const;
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db_lockmode_t get_mode() const;
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const Dbt* get_obj() const;
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DbLock *get_lock() const;
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int get_index() const;
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}; </pre>
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<p>
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This information describes the <code class="classname">DbLockNotGrantedException</code> class and how
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it is used by the various Berkeley DB classes.
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</p>
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<p>
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A <code class="classname">DbLockNotGrantedException</code> is thrown when
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lock or transaction timeouts have been configured, a database operation has timed out, and the
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<a class="link" href="envset_flags.html#envset_flags_DB_TIME_NOTGRANTED">DB_TIME_NOTGRANTED</a>
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configuration flag has been specified.
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</p>
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<p>
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Additionally <code class="classname">DbLockNotGrantedException</code> is thrown when a Berkeley DB
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Concurrent Data Store database environment configured for lock timeouts was unable to grant
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a lock in the allowed time.
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</p>
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<p>
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Finally, <code class="classname">DbLockNotGrantedException</code> is thrown when a lock requested using the
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<a class="xref" href="lockget.html" title="DbEnv::lock_get()">DbEnv::lock_get()</a>
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or
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<a class="xref" href="lockvec.html" title="DbEnv::lock_vec()">DbEnv::lock_vec()</a>
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methods, where the <a class="link" href="lockvec.html#vec_DB_LOCK_NOWAIT">DB_LOCK_NOWAIT</a>
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flag or lock timers were configured, could not be granted before the wait-time expired.
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</p>
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<p>
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The <a class="link" href="dbexception.html" title="Chapter 6. The DbException Class">DbException</a> errno value is set to
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<code class="literal">DB_LOCK_NOTGRANTED</code>.
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</p>
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<p>
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The following getter methods are available on this class:
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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="methodname">get_op()</code>
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</p>
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<p>
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Returns <code class="literal">DB_LOCK_GET</code> when <a class="xref" href="lockget.html" title="DbEnv::lock_get()">DbEnv::lock_get()</a>
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was called, and returns the <span class="bold"><strong>op</strong></span> for the failed
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<code class="literal">DB_LOCKREQ</code> when <a class="xref" href="lockvec.html" title="DbEnv::lock_vec()">DbEnv::lock_vec()</a>
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was called. If this exception is raised due to a database
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operation, <code class="literal">DB_LOCK_GET</code> is returned.
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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="methodname">get_mode()</code>
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</p>
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<p>
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Returns the <span class="bold"><strong>mode</strong></span> parameter when
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<a class="xref" href="lockget.html" title="DbEnv::lock_get()">DbEnv::lock_get()</a> was called, and returns the
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<span class="bold"><strong>mode</strong></span> for the failed <code class="literal">DB_LOCKREQ</code>
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when <a class="xref" href="lockvec.html" title="DbEnv::lock_vec()">DbEnv::lock_vec()</a> was called.
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If this exception is raised due to a database operation,
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<code class="literal">DB_LOCK_NG</code> is returned.
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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="methodname">get_obj()</code>
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</p>
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<p>
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Returns the <span class="bold"><strong>object</strong></span> parameter when
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<a class="xref" href="lockget.html" title="DbEnv::lock_get()">DbEnv::lock_get()</a> was called, and returns the
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<span class="bold"><strong>object</strong></span> for the failed <code class="literal">DB_LOCKREQ</code>
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when <a class="xref" href="lockvec.html" title="DbEnv::lock_vec()">DbEnv::lock_vec()</a> was called.
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The <a class="link" href="dbt.html" title="Chapter 4. The Dbt Handle">Dbt</a> pointer may or may not refer valid
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memory, depending on whether the <a class="link" href="dbt.html" title="Chapter 4. The Dbt Handle">Dbt</a>
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used in the call to the failed <a class="xref" href="lockget.html" title="DbEnv::lock_get()">DbEnv::lock_get()</a>
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or <a class="xref" href="lockvec.html" title="DbEnv::lock_vec()">DbEnv::lock_vec()</a> method is still in
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scope and has not been deleted.
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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="methodname">get_lock()</code>
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</p>
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<p>
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Returns NULL when <a class="xref" href="lockget.html" title="DbEnv::lock_get()">DbEnv::lock_get()</a> was called,
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and returns the <span class="bold"><strong>lock</strong></span> in the failed <code class="literal">DB_LOCKREQ</code>
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when <a class="xref" href="lockvec.html" title="DbEnv::lock_vec()">DbEnv::lock_vec()</a> was called.
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If this exception is raised due to a database operation, NULL is returned.
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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="methodname">get_index()</code>
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</p>
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<p>
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Returns <code class="literal">-1</code> when <a class="xref" href="lockget.html" title="DbEnv::lock_get()">DbEnv::lock_get()</a> was called,
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and returns the index of the failed <code class="literal">DB_LOCKREQ</code>
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when <a class="xref" href="lockvec.html" title="DbEnv::lock_vec()">DbEnv::lock_vec()</a> was called.
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If this exception is raised due to a database operation,
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<code class="literal">0</code> is returned.
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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 class="navfooter">
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<hr />
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="dbdeadlock.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="dbexception.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="dbmemory.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">DbDeadlockException </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>
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<td width="40%" align="right" valign="top"> DbMemoryException</td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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