Lock, mutex, semaphore… what’s the difference?

[Originally Posted By]: http://stackoverflow.com/questions/2332765/lock-mutex-semaphore-whats-the-difference

A lock allows only one thread to enter the part that’s locked and the lock is not shared with any other processes.

A mutex is the same as a lock but it can be system wide (shared by multiple processes).

A semaphore does the same as a mutex but allows x number of threads to enter.

You also have read/write locks that allows either unlimited number of readers or 1 writer at any given time.

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