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Threads - Programming

Q1:

Assume the following method is properly synchronized and called from a thread A on an object B: wait(2000); After calling this method, when will the thread A become a candidate to get another turn at the CPU?

A After thread A is notified, or after two seconds.

B After the lock on B is released, or after two seconds.

C Two seconds after thread A is notified.

D Two seconds after lock B is released.

ANS:A - After thread A is notified, or after two seconds.

Option A. Either of the two events (notification or wait time expiration) will make the thread become a candidate for running again. Option B is incorrect because a waiting thread will not return to runnable when the lock is released, unless a notification occurs. Option C is incorrect because the thread will become a candidate immediately after notification, not two seconds afterwards. Option D is also incorrect because a thread will not come out of a waiting pool just because a lock has been released.