Discussion :: Threads
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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?
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A.
After thread A is notified, or after two seconds.
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B.
After the lock on B is released, or after two seconds.
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C.
Two seconds after thread A is notified.
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D.
Two seconds after lock B is released.
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Answer : Option A
Explanation :
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.
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