Some of the different types of Mutex:
-- Fair / Unfair Mutex : A mutex which allows access in the order of locking
-- Reentrant : which allows recursive locking, helpful when there are recursive calls in the code. See also man page description of PTHREAD_MUTEX_RECURSIVE
-- Scalable Mutex
-- Sleep or spin : spin is optimal for short waits and sleep for long waits. And also while spining, there is no need for context switch.
Reference : Intel threading building blocks: outfitting C++ for multi-core processor ... By James Reinders, p.114
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