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Python MCQs

Regarding Thread Synchronization Primitives in Python, which of the following is incorrect ?

Mutual Exclusion Lock (`threading.Lock`) are used to synchronize threads so that only one thread can make modifications to shared data at any given time. Only one thread can successfully `acquire()` the lock at any given time.

Reentrant Mutex Lock (`threading.RLock`) are similar to a normal mutex lock except that it can be reacquired multiple times by the same thread.

Semaphores (`threading.Semaphore`) are counter-based synchronization primitive, `acquire()/release()` increments or decrements a internal counter, and like locks, cannot be called in any order and by any thread.

Event Objects (`threading.Event`) can be used to have one or more threads wait for something to occur. Setting an event will unblock all waiting threads simultaneously (if any).

Answer

Correct Answer: Semaphores (`threading.Semaphore`) are counter-based synchronization primitive, `acquire()/release()` increments or decrements a internal counter, and like locks, cannot be called in any order and by any thread.

Explanation:

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