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Java ReentrantLock hasQueuedThread() Method
The hasQueuedThread(Thread thread) method of ReentrantLock class returns true if there is some thread is waiting for the this lock. Note that because cancellations may occur at any time, a true return does not guarantee that this thread will ever acquire this lock. This method is designed primarily to use in monitoring of the system state.
Syntax
Parameter
thread – the thread
Returns
true if the given thread is queued waiting for this lock
Throws
NullPointerException – if the thread is null.
Example 1
Output:
Thread-1 is Waiting to get the lock Thread-1 has got the lock. has queued Thread = false Thread-1 has released the lock.
Example 2
Output:
Thread-2 is Waiting to get the lock Thread-3 is Waiting to get the lock Thread-1 is Waiting to get the lock Thread-2 has got the lock. has queued Thread = false Thread-2 has released the lock. Thread-3 has got the lock. has queued Thread = false Thread-3 has released the lock. Thread-1 has got the lock. has queued Thread = false Thread-1 has released the lock.
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