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<th width="60%" align="center">Chapter 6.
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<h2 class="title" style="clear: both"><a id="lockid"></a>DB_ENV->lock_id()</h2>
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<pre class="programlisting">#include <db.h>
int
DB_ENV->lock_id(DB_ENV *env, u_int32_t *idp); </pre>
<p>
The <code class="methodname">DB_ENV->lock_id()</code> method copies a
locker ID, which is guaranteed to be unique in the environment's
lock table, into the memory location to which
<span class="bold"><strong>idp</strong></span> refers.
</p>
<p>
Note that lockers are not free-threaded; lockers can not be used by
more than one thread at the same time.
</p>
<p>
The <a class="xref" href="lockid_free.html" title="DB_ENV->lock_id_free()">DB_ENV->lock_id_free()</a>
method should be called to return the locker ID to the Berkeley DB
library when it is no longer needed.
</p>
<p>
The <code class="methodname">DB_ENV->lock_id()</code> <span>
<span>
method returns a non-zero error value on failure and 0 on success.
</span>
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<h4 class="title"><a id="idp52611968"></a>idp</h4>
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<p>
The <span class="bold"><strong>idp</strong></span> parameter references memory
into which the allocated locker ID is copied.
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<h3 class="title"><a id="idp52638168"></a>Class</h3>
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<a class="link" href="env.html" title="Chapter 5. The DB_ENV Handle">DB_ENV</a>,
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<a class="xref" href="lock.html#locklist" title="Locking Subsystem and Related Methods">Locking Subsystem and Related Methods</a>
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