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+This demonstrates the use of a semaphore with a Python context manager (a 
+'with' statement).
+
+To run the demo, simply run `python parent.py`. It launches child.py.
+
+The programs parent.py and child.py share a semaphore; the latter acquires the
+semaphore via a context manager. The child process deliberately kills itself via
+an error about half the time (randomly) in order to demonstrate that the
+context manager releases the semaphore regardless of whether or not the context
+block is exited gracefully.
+
+Once the child releases the semaphore, the parent destroys it.
+
+The whole thing happens in less than 10 seconds.
+