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+PR_Lock
+=======
+
+Locks a specified lock object.
+
+
+Syntax
+------
+
+.. code::
+
+   #include <prlock.h>
+
+   void PR_Lock(PRLock *lock);
+
+
+Parameter
+~~~~~~~~~
+
+:ref:`PR_Lock` has one parameter:
+
+``lock``
+   A pointer to a lock object to be locked.
+
+
+Description
+-----------
+
+When :ref:`PR_Lock` returns, the calling thread is "in the monitor," also
+called "holding the monitor's lock." Any thread that attempts to acquire
+the same lock blocks until the holder of the lock exits the monitor.
+Acquiring the lock is not an interruptible operation, nor is there any
+timeout mechanism.
+
+:ref:`PR_Lock` is not reentrant. Calling it twice on the same thread
+results in undefined behavior.
+
+
+See Also
+--------
+
+ - :ref:`PR_Unlock`