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+PRThreadType
+============
+
+The type of an NSPR thread, specified as a parameter to
+:ref:`PR_CreateThread`.
+
+
+Syntax
+------
+
+.. code::
+
+   #include <prthread.h>
+
+   typedef enum PRThreadType {
+      PR_USER_THREAD,
+      PR_SYSTEM_THREAD
+   } PRThreadType;
+
+
+Enumerators
+~~~~~~~~~~~
+
+``PR_USER_THREAD``
+   :ref:`PR_Cleanup` blocks until the last thread of type
+   ``PR_USER_THREAD`` terminates.
+``PR_SYSTEM_THREAD``
+   NSPR ignores threads of type ``PR_SYSTEM_THREAD`` when determining
+   when a call to :ref:`PR_Cleanup` should return.
+
+
+Description
+-----------
+
+Threads can be either user threads or system threads. NSPR allows the
+client to synchronize the termination of all user threads and ignores
+those created as system threads. This arrangement implies that a system
+thread should not have volatile data that needs to be safely stored
+away. The applicability of system threads is somewhat dubious;
+therefore, they should be used with caution.