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The DB_LOCK Handle
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<h2 class="title"><a id="lock"></a>Chapter 6.
The DB_LOCK Handle
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<pre class="programlisting">#include <db.h>
typedef struct __db_lock_u DB_LOCK; </pre>
<p>
The locking interfaces for the Berkeley DB database environment
are methods of the <a class="link" href="env.html" title="Chapter 5. The DB_ENV Handle">DB_ENV</a>
handle. The <code class="classname">DB_LOCK</code> object is
the handle for a single lock, and has no methods of its own.
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<h2 class="title" style="clear: both"><a id="locklist"></a>Locking Subsystem and Related Methods</h2>
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<th>Locking Subsystem and Related Methods</th>
<th>Description</th>
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<td>
<a class="xref" href="lockdetect.html" title="DB_ENV->lock_detect()">
<span>DB_ENV->lock_detect()</span>
</a>
</td>
<td>Perform deadlock detection</td>
</tr>
<tr>
<td>
<a class="xref" href="lockget.html" title="DB_ENV->lock_get()">
<span>DB_ENV->lock_get()</span>
</a>
</td>
<td>Acquire a lock</td>
</tr>
<tr>
<td>
<a class="xref" href="lockid.html" title="DB_ENV->lock_id()">
<span>DB_ENV->lock_id()</span>
</a>
</td>
<td>Acquire a locker ID</td>
</tr>
<tr>
<td>
<a class="xref" href="lockid_free.html" title="DB_ENV->lock_id_free()">
<span>DB_ENV->lock_id_free()</span>
</a>
</td>
<td>Release a locker ID</td>
</tr>
<tr>
<td>
<a class="xref" href="lockput.html" title="DB_ENV->lock_put()">
<span>DB_ENV->lock_put()</span>
</a>
</td>
<td>Release a lock</td>
</tr>
<tr>
<td>
<a class="xref" href="lockstat.html" title="DB_ENV->lock_stat()">
<span>DB_ENV->lock_stat()</span>
</a>
</td>
<td>Return lock subsystem statistics</td>
</tr>
<tr>
<td>
<a class="xref" href="lockstat_print.html" title="DB_ENV->lock_stat_print()">
<span>DB_ENV->lock_stat_print()</span>
</a>
</td>
<td>Print lock subsystem statistics</td>
</tr>
<tr>
<td>
<a class="xref" href="lockvec.html" title="DB_ENV->lock_vec()">
<span>DB_ENV->lock_vec()</span>
</a>
</td>
<td>Acquire/release locks</td>
</tr>
<tr>
<td>
<a class="xref" href="envcdsgroup_begin.html" title="DB_ENV->cdsgroup_begin()">
<span>DB_ENV->cdsgroup_begin()</span>
</a>
</td>
<td>Get a locker ID in Berkeley DB Concurrent Data Store</td>
</tr>
<tr>
<td colspan="2">
<span class="bold">
<strong>Locking Subsystem Configuration</strong>
</span>
</td>
</tr>
<tr>
<td><a class="xref" href="envset_timeout.html" title="DB_ENV->set_timeout()">
<span>DB_ENV->set_timeout()</span>
</a>, <a class="xref" href="envget_timeout.html" title="DB_ENV->get_timeout()">
<span>DB_ENV->get_timeout()</span>
</a></td>
<td>Set/get lock and transaction timeout</td>
</tr>
<tr>
<td><a class="xref" href="envset_lk_conflicts.html" title="DB_ENV->set_lk_conflicts()">
<span>DB_ENV->set_lk_conflicts()</span>
</a>, <a class="xref" href="envget_lk_conflicts.html" title="DB_ENV->get_lk_conflicts()">
<span>DB_ENV->get_lk_conflicts()</span>
</a></td>
<td>Set/get lock conflicts matrix</td>
</tr>
<tr>
<td><a class="xref" href="envset_lk_detect.html" title="DB_ENV->set_lk_detect()">
<span>DB_ENV->set_lk_detect()</span>
</a>, <a class="xref" href="envget_lk_detect.html" title="DB_ENV->get_lk_detect()">
<span>DB_ENV->get_lk_detect()</span>
</a></td>
<td>Set/get automatic deadlock detection</td>
</tr>
<tr>
<td><a class="xref" href="envset_lk_max_lockers.html" title="DB_ENV->set_lk_max_lockers()">
<span>DB_ENV->set_lk_max_lockers()</span>
</a>, <a class="xref" href="envget_lk_max_lockers.html" title="DB_ENV->get_lk_max_lockers()">
<span>DB_ENV->get_lk_max_lockers()</span>
</a></td>
<td>Set/get maximum number of lockers</td>
</tr>
<tr>
<td><a class="xref" href="envset_lk_max_locks.html" title="DB_ENV->set_lk_max_locks()">
<span>DB_ENV->set_lk_max_locks()</span>
</a>, <a class="xref" href="envget_lk_max_locks.html" title="DB_ENV->get_lk_max_locks()">
<span>DB_ENV->get_lk_max_locks()</span>
</a></td>
<td>Set/get maximum number of locks</td>
</tr>
<tr>
<td><a class="xref" href="envset_lk_max_objects.html" title="DB_ENV->set_lk_max_objects()">
<span>DB_ENV->set_lk_max_objects()</span>
</a>, <a class="xref" href="envget_lk_max_objects.html" title="DB_ENV->get_lk_max_objects()">
<span>DB_ENV->get_lk_max_objects()</span>
</a></td>
<td>Set/get maximum number of lock objects</td>
</tr>
<tr>
<td><a class="xref" href="envset_lk_partitions.html" title="DB_ENV->set_lk_partitions()">
<span>DB_ENV->set_lk_partitions()</span>
</a>, <a class="xref" href="envget_lk_partitions.html" title="DB_ENV->get_lk_partitions()">
<span>DB_ENV->get_lk_partitions()</span>
</a></td>
<td>Set/get number of lock partitions</td>
</tr>
<tr>
<td><a class="xref" href="envset_lk_priority.html" title="DB_ENV->set_lk_priority()">
<span>DB_ENV->set_lk_priority()</span>
</a>, <a class="xref" href="envget_lk_priority.html" title="DB_ENV->get_lk_priority()">
<span>DB_ENV->get_lk_priority()</span>
</a></td>
<td>Set/get a locker's deadlock priority</td>
</tr>
<tr>
<td><a class="xref" href="envset_lk_tablesize.html" title="DB_ENV->set_lk_tablesize()">
<span>DB_ENV->set_lk_tablesize()</span>
</a>, <a class="xref" href="envget_lk_tablesize.html" title="DB_ENV->get_lk_tablesize()">
<span>DB_ENV->get_lk_tablesize()</span>
</a></td>
<td>Set/get size of the lock object hash table</td>
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