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<h2 class="title" style="clear: both"><a id="mutexlock"></a>DB_ENV->mutex_lock()</h2>
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<pre class="programlisting">#include <db.h>
int
DB_ENV->mutex_lock(DB_ENV *dbenv, db_mutex_t mutex); </pre>
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The <code class="methodname">DB_ENV->mutex_lock()</code> method locks the mutex allocated by
<a class="xref" href="mutexalloc.html" title="DB_ENV->mutex_alloc()">DB_ENV->mutex_alloc()</a>. The
thread of control calling <code class="methodname">DB_ENV->mutex_lock()</code> will block until the
lock is available.
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The <code class="methodname">DB_ENV->mutex_lock()</code> <span>
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<h4 class="title"><a id="idp53725800"></a>mutex</h4>
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The <span class="bold"><strong>mutex</strong></span> parameter is a mutex
previously allocated by <a class="xref" href="mutexalloc.html" title="DB_ENV->mutex_alloc()">DB_ENV->mutex_alloc()</a>.
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The <code class="methodname">DB_ENV->mutex_lock()</code> <span>
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method may fail and return one of the following non-zero errors:
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An invalid flag value or parameter was specified.
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<a class="xref" href="mutex.html#mutexlist" title="Mutex Methods">Mutex Methods</a>
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