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The DbLock Handle
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<h2 class="title"><a id="lock"></a>Chapter 7.
The DbLock Handle
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<pre class="programlisting">
#include <db_cxx.h>
class DbLock {
public:
DbLock();
DbLock(const DbLock &);
DbLock &operator = (const DbLock &);
~DbLock();
}; </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 DbEnv Handle">DbEnv</a>
handle. The <code class="classname">DbLock</code> object is
the handle for a single lock, and has no methods of its own.
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<a class="xref" href="dbdeadlock.html" title="DbDeadlockException">DbDeadlockException</a>
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<td>Exception class for deadlocks</td>
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<a class="xref" href="dblocknotgranted.html" title="DbLockNotGrantedException">DbLockNotGrantedException</a>
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<a class="xref" href="lockdetect.html" title="DbEnv::lock_detect()">DbEnv::lock_detect()</a>
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<td>Perform deadlock detection</td>
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<a class="xref" href="lockget.html" title="DbEnv::lock_get()">DbEnv::lock_get()</a>
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<td>Acquire a lock</td>
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<a class="xref" href="lockid.html" title="DbEnv::lock_id()">DbEnv::lock_id()</a>
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<td>Acquire a locker ID</td>
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<td>Release a locker ID</td>
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<a class="xref" href="lockput.html" title="DbEnv::lock_put()">DbEnv::lock_put()</a>
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<td>Release a lock</td>
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<td>Return lock subsystem statistics</td>
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<a class="xref" href="lockstat_print.html" title="DbEnv::lock_stat_print()">DbEnv::lock_stat_print()</a>
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<td>Print lock subsystem statistics</td>
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<a class="xref" href="lockvec.html" title="DbEnv::lock_vec()">DbEnv::lock_vec()</a>
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<td>Acquire/release locks</td>
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<td>
<a class="xref" href="envcdsgroup_begin.html" title="DbEnv::cdsgroup_begin()">DbEnv::cdsgroup_begin()</a>
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<td>Get a locker ID in Berkeley DB Concurrent Data Store</td>
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<strong>Locking Subsystem Configuration</strong>
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<td><a class="xref" href="envset_timeout.html" title="DbEnv::set_timeout()">DbEnv::set_timeout()</a>, <a class="xref" href="envget_timeout.html" title="DbEnv::get_timeout()">DbEnv::get_timeout()</a></td>
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<td><a class="xref" href="envset_lk_conflicts.html" title="DbEnv::set_lk_conflicts()">DbEnv::set_lk_conflicts()</a>, <a class="xref" href="envget_lk_conflicts.html" title="DbEnv::get_lk_conflicts()">DbEnv::get_lk_conflicts()</a></td>
<td>Set/get lock conflicts matrix</td>
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<td><a class="xref" href="envset_lk_detect.html" title="DbEnv::set_lk_detect()">DbEnv::set_lk_detect()</a>, <a class="xref" href="envget_lk_detect.html" title="DbEnv::get_lk_detect()">DbEnv::get_lk_detect()</a></td>
<td>Set/get automatic deadlock detection</td>
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<td><a class="xref" href="envset_lk_max_lockers.html" title="DbEnv::set_lk_max_lockers()">DbEnv::set_lk_max_lockers()</a>, <a class="xref" href="envget_lk_max_lockers.html" title="DbEnv::get_lk_max_lockers()">DbEnv::get_lk_max_lockers()</a></td>
<td>Set/get maximum number of lockers</td>
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<td><a class="xref" href="envset_lk_max_locks.html" title="DbEnv::set_lk_max_locks()">DbEnv::set_lk_max_locks()</a>, <a class="xref" href="envget_lk_max_locks.html" title="DbEnv::get_lk_max_locks()">DbEnv::get_lk_max_locks()</a></td>
<td>Set/get maximum number of locks</td>
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<td><a class="xref" href="envset_lk_max_objects.html" title="DbEnv::set_lk_max_objects()">DbEnv::set_lk_max_objects()</a>, <a class="xref" href="envget_lk_max_objects.html" title="DbEnv::get_lk_max_objects()">DbEnv::get_lk_max_objects()</a></td>
<td>Set/get maximum number of lock objects</td>
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<td><a class="xref" href="envset_lk_partitions.html" title="DbEnv::set_lk_partitions()">DbEnv::set_lk_partitions()</a>, <a class="xref" href="envget_lk_partitions.html" title="DbEnv::get_lk_partitions()">DbEnv::get_lk_partitions()</a></td>
<td>Set/get number of lock partitions</td>
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<td><a class="xref" href="envset_lk_priority.html" title="DbEnv::set_lk_priority()">DbEnv::set_lk_priority()</a>, <a class="xref" href="envget_lk_priority.html" title="DbEnv::get_lk_priority()">DbEnv::get_lk_priority()</a></td>
<td>Set/get a locker's deadlock priority</td>
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<td><a class="xref" href="envset_lk_tablesize.html" title="DbEnv::set_lk_tablesize()">DbEnv::set_lk_tablesize()</a>, <a class="xref" href="envget_lk_tablesize.html" title="DbEnv::get_lk_tablesize()">DbEnv::get_lk_tablesize()</a></td>
<td>Set/get size of the lock object hash table</td>
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