Discussion 5

Reference links:
http://www-inst.eecs.berkeley.edu/~cs61c/sp16/disc/4/Disc4.pdf
http://shtech.org/course/ca/16s/hw/4/
http://shtech.org/course/ca/16s/discussions/Discussion_06.zip
http://timmurphy.org/2010/05/04/pthreads-in-c-a-minimal-working-example/