handles on Windows.
On Unix using the *spawn* or *forkserver* start methods will also
-start a *semaphore tracker* process which tracks the unlinked named
-semaphores created by processes of the program. When all processes
-have exited the semaphore tracker unlinks any remaining semaphores.
+start a *resource tracker* process which tracks the unlinked named
+system resources (such as named semaphores or
+:class:`~multiprocessing.shared_memory.SharedMemory` objects) created
+by processes of the program. When all processes
+have exited the resource tracker unlinks any remaining tracked object.
Usually there should be none, but if a process was killed by a signal
-there may be some "leaked" semaphores. (Unlinking the named semaphores
-is a serious matter since the system allows only a limited number, and
-they will not be automatically unlinked until the next reboot.)
+there may be some "leaked" resources. (Neither leaked semaphores nor shared
+memory segments will be automatically unlinked until the next reboot. This is
+problematic for both objects because the system allows only a limited number of
+named semaphores, and shared memory segments occupy some space in the main
+memory.)
To select a start method you use the :func:`set_start_method` in
the ``if __name__ == '__main__'`` clause of the main module. For