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HandlePut(object o) performs what?

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HandlePut(object o) performs what?

(a) Fixing values

(b) Locking

(c) Changing values

(d) Unlocking

The question was posed to me at a job interview.

I'd like to ask this question from Multithreading topic in section Going Parallel, Handling Actuator and Sensor of IOT

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The correct choice is (d) Unlocking

Easiest explanation: void HandlePut(object o) method puts 0 into buffer. The new value in the buffer replaces the old one. The method performs the necessary locking to enable safe use of the buffer from multi threads.

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