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    <title>DbEnv::lock_id()</title>
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    <link rel="up" href="lock.html" title="Chapter 7.  The DbLock Handle" />
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          <th colspan="3" align="center">DbEnv::lock_id()</th>
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          <td width="20%" align="left"><a accesskey="p" href="lockget.html">Prev</a> </td>
          <th width="60%" align="center">Chapter 7. 
                The DbLock Handle
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    <div class="sect1" lang="en" xml:lang="en">
      <div class="titlepage">
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          <div>
            <h2 class="title" style="clear: both"><a id="lockid"></a>DbEnv::lock_id()</h2>
          </div>
        </div>
      </div>
      <pre class="programlisting">#include &lt;db_cxx.h&gt;
 
int
DbEnv::lock_id(u_int32_t *idp);</pre>
      <p>
         The <code class="methodname">DbEnv::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>
         The <a class="xref" href="lockid_free.html" title="DbEnv::lock_id_free()">DbEnv::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">DbEnv::lock_id()</code> <span>
            
            <span>
                method either returns a non-zero error value or throws an
                exception that encapsulates a non-zero error value on
                failure, and returns 0 on success.
            </span>
        </span>
    </p>
      <div class="sect2" lang="en" xml:lang="en">
        <div class="titlepage">
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            <div>
              <h3 class="title"><a id="idp52715096"></a>Parameters</h3>
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        <div class="sect3" lang="en" xml:lang="en">
          <div class="titlepage">
            <div>
              <div>
                <h4 class="title"><a id="idp52716008"></a>idp</h4>
              </div>
            </div>
          </div>
          <p>
                          The <span class="bold"><strong>idp</strong></span> parameter references memory
                          into which  the allocated locker ID is copied.
                     </p>
        </div>
      </div>
      <div class="sect2" lang="en" xml:lang="en">
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          <div>
            <div>
              <h3 class="title"><a id="idp52750472"></a>Class</h3>
            </div>
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        <p>
                    <a class="link" href="env.html" title="Chapter 5.  The DbEnv Handle">DbEnv</a>, 
                    <a class="link" href="lock.html" title="Chapter 7.  The DbLock Handle">DbLock</a> 
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              <h3 class="title"><a id="idp52731408"></a>See Also</h3>
            </div>
          </div>
        </div>
        <p>
                     <a class="xref" href="lock.html#locklist" title="Locking Subsystem and Related Methods">Locking Subsystem and Related Methods</a> 
                </p>
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          <td width="40%" align="left" valign="top">DbEnv::lock_get() </td>
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          <td width="40%" align="right" valign="top"> DbEnv::lock_id_free()</td>
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