C: Semaphores - How to release a semaphore after n callbacks only

C: Semaphores - How to release a semaphore after n callbacks only

References

Reference NO 1

http://stackoverflow.com/questions/15195513/c-semaphores-how-to-release-a-semaphore-after-n-callbacks-only

Reference NO 2

http://stackoverflow.com/questions/5600354/when-should-i-use-semaphores

Reference NO 3

http://search.cpan.org/~mlehmann/Coro-6.31/Coro/Intro.pod

Reference NO 4

http://www.massey.ac.nz/~iabond/159335/dining.c

Reference NO 5

http://msdn.microsoft.com/en-us/library/orm-9780596527570-03-19.aspx

Reference NO 6

http://geekswithblogs.net/abhijeetp/archive/2012/07/15/mutexes-semaphores-monitors-readerwriterlocks-autoresetevents--manualresets-oh-my.aspx

Reference NO 7

http://bojan-komazec.blogspot.com/2012/01/thread-and-process-synchronisation-with.html

Reference NO 8

http://developer.apple.com/library/ios/DOCUMENTATION/General/Conceptual/ConcurrencyProgrammingGuide/OperationQueues/OperationQueues.html