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

A lock allows only one thread to enter the part thats locked and the lock is not shared with any other processes, a mutex is the same as a lock but system wide and a semaphore does the same as a lock but allows x number of threads to enter.

A lock allows only one thread to enter the part thats locked and the lock is not shared with any other processes, a mutex is the same as a lock but system wide and a semaphore does the same as a lock but allows x number of threads to enter...

There's a wiki article on the subject that explains it well.

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