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3Steve Matthews. Demonstration on the Problems of Distributed Systems[EB/OL]. http://www.dcs.warwick.ac.uk/people/academic/Steve.Matthews/open/pc.html.
4Jim Mooney. A Semaphore Solution to the Producer-Consumer Problem [EB/OL]. http://www.csee.wvu.edu/~jdm/classes/cs356/notes/mutex/pc-sem.html.