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I understand that Thread.currentThread().yield() is a notification to thread scheduler that it may assign cpu cycle to some other thread of same priority if any such is present.
My question is: If current thread has got lock on some object and calls yield(), will it loses that lock right away? And when thread scheduler finds out there is no such thread to assign cpu cycle, then the thread which has called yield() will again be in fight to get lock on the object which it has lost earlier??
I couldn't find it in javadoc and forums [http://www.coderanch.com/t/226223/java-programmer-SCJP/certification/does-sleep-yield-release-lock] have 50-50 answers.
I think yield() (lets say thread1) should release lock because if some thread (lets say thread2) of same priority wants to operate on same object, then it can have chance when thread scheduler eventually assign cup to thread2.
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Thread. yield method gives hint to the thread scheduler that it is ready to pause its execution. The thread scheduler is free to ignore this hint. If any thread executes the yield method, the thread scheduler checks if there is any thread with the same or high priority as this thread.
If a thread wants to execute a synchronized method on a given object, first it has to get a lock of that object. Once thread got the lock then it is allowed to execute any synchronized method on that object.
When a thread invokes a synchronized method, it automatically acquires the intrinsic lock for that method's object and releases it when the method returns. The lock release occurs even if the return was caused by an uncaught exception.
No. If a object has synchronized instance methods then the Object itself is used a lock object for controlling the synchronization. Therefore all other instance methods need to wait until previous method call is completed.
No. Thread.yield() is not like Object.wait(). It just gives up control to allow a thread switch. It will have no effect on the concurrency of your program.
There is no guarantee which thread the scheduler will run after a yield.
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