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+PR_Cleanup
+==========
+
+Coordinates a graceful shutdown of NSPR.
+
+
+Syntax
+------
+
+.. code::
+
+   #include <prinit.h>
+
+   PRStatus PR_Cleanup(void);
+
+
+Returns
+~~~~~~~
+
+The function returns one of the following values:
+
+-  If NSPR has been shut down successfully, ``PR_SUCCESS``.
+-  If the calling thread of this function is not the primordial thread,
+   ``PR_FAILURE``.
+
+
+Description
+-----------
+
+:ref:`PR_Cleanup` must be called by the primordial thread near the end of
+the ``main`` function.
+
+:ref:`PR_Cleanup` attempts to synchronize the natural termination of the
+process. It does so by blocking the caller, if and only if it is the
+primordial thread, until all user threads have terminated. When the
+primordial thread returns from ``main``, the process immediately and
+silently exits. That is, the process (if necessary) forcibly terminates
+any existing threads and exits without significant blocking and without
+error messages or core files.