explain the life cycle of thread?
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Answer Posted / nishant s mevawala
Ready-to-run: A thread starts its life cycle with a call to start().
For example
MyThread aThread = new MyThread();
aThread.start();
A call to start() will not immediately start thread's execution but rather will move it to pool of threads waiting for their turn to be picked for execution. The thread scheduler picks one of the ready-to-run threads based on thread priorities.
Running : The thread code is being actively executed by the processor. It runs until it is swapped out, becomes blocked, or voluntarily give up its turn with this static method
Thread.yield();
Please note that yield() is a static method. Even if it is called on any thread object, it causes the currently executing thread to give up the CPU.
Waiting : A call to java.lang.Object's wait() method causes the current thread object to wait. The thread remains in "Waiting" state until some another thread invokes notify() or the notifyAll() method of this object. The current thread must own this object's monitor for calling the wait().
Sleeping : Java thread may be forced to sleep (suspended) for some predefined time.
Thread.sleep(milliseconds);
Thread.sleep(milliseconds, nanoseconds);
Please note that static method sleep() only guarantees that the thread will sleep for predefined time and be running some time after the predefined time has been elapsed.
For example, a call to sleep(60) will cause the currently executing thread to sleep for 60 milliseconds. This thread will be in ready-to-run state after that. It will be in "Running" state only when the scheduler will pick it for execution. Thus we can only say that the thread will run some time after 60 milliseconds.
Blocked on I/O. : A java thread may enter this state while waiting for data from the IO device. The thread will move to Ready-to-Run after I/O condition changes (such as reading a byte of data).
Blocked on Synchronization. : A java thread may enter this state while waiting for object lock. The thread will move to Ready-to-Run when a lock is acquired.
Dead : A java thread may enter this state when it is finished working. It may also enter this state if the thread is terminated by an unrecoverable error condition.
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