136: THREAD TRANSITIONS in Java

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136: THREAD TRANSITIONS
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public boolean isEmpty() { return topOfStack < 0; } } //_______________________________________________________________________________ abstract class StackUser implements Runnable { // (5) Stack user protected StackImpl stack; StackUser(String threadName, StackImpl stack) { thisstack = stack; Thread worker = new Thread(this, threadName); Systemoutprintln(worker); workersetDaemon(true); workerstart(); } // (6)
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// (7) Daemon thread status // (8) Start the thread
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} //_______________________________________________________________________________ class StackPopper extends StackUser { // (9) Popper StackPopper(String threadName, StackImpl stack) { super(threadName, stack); } public void run() { while (true) stackpop(); } } //_______________________________________________________________________________ class StackPusher extends StackUser { // (10) Pusher StackPusher(String threadName, StackImpl stack) { super(threadName, stack); } public void run() { while (true) stackpush(2008); } } //_______________________________________________________________________________ public class WaitAndNotifyClient { public static void main(String[] args) throws InterruptedException { // (11) StackImpl stack = new StackImpl(5); new StackPusher("A", stack); new StackPusher("B", stack); new StackPopper("C", stack); Systemoutprintln("Main Thread sleeping"); Threadsleep(10); Systemoutprintln("Exit from Main Thread"); } } // Stack of capacity 5
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Thread[A,5,main] Thread[B,5,main] Thread[C,5,main] Main Thread sleeping Thread[A,5,main]: pushing Thread[A,5,main]: waiting to push Thread[B,5,main]: pushing Thread[B,5,main]: waiting to push
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646 Thread[C,5,main]: popping Thread[C,5,main]: notifying after Thread[A,5,main]: notifying after Thread[A,5,main]: pushing Thread[A,5,main]: waiting to push Thread[B,5,main]: waiting to push Thread[C,5,main]: popping Thread[C,5,main]: notifying after Thread[A,5,main]: notifying after Thread[B,5,main]: notifying after Exit from Main Thread
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CHAPTER 13: THREADS
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Example 135 illustrates how a thread waiting as a result of calling the wait() method on an object is notified by another thread calling the notify() method on the same object, in order for the first thread to start running again One usage of the wait() call is shown in Example 135 at (1) in the synchronized pop() method When a thread executing this method on the StackImpl object finds that the stack is empty, it invokes the wait() method in order to wait for some thread to push something on this stack first Another use of the wait() call is shown at (3) in the synchronized push() method When a thread executing this method on the StackImpl object finds that the stack is full, it invokes the wait() method to await some thread removing an element first, in order to make room for a push operation on the stack When a thread executing the synchronized method push() on the StackImpl object successfully pushes an element on the stack, it calls the notify() method at (4) The wait set of the StackImpl object contains all waiting threads that have earlier called the wait() method at either (1) or (3) on this StackImpl object A single thread from the wait set is enabled for running If this thread was executing a pop operation, it now has a chance of being successful because the stack is not empty at the moment If this thread was executing a push operation, it can try again to see if there is room on the stack When a thread executing the synchronized method pop() on the StackImpl object successfully pops an element off the stack, it calls the notify() method at (2) Again assuming that the wait set of the StackImpl object is not empty, one thread from the set is arbitrarily chosen and enabled If the notified thread was executing a pop operation, it can proceed to see if the stack still has an element to pop If the notified thread was executing a push operation, it now has a chance of succeeding, because the stack is not full at the moment Note that the waiting condition at (1) for the pop operation is executed in a loop A waiting thread that has been notified is not guaranteed to run right away Before it gets to run, another thread may synchronize on the stack and empty it If the notified thread was waiting to pop the stack, it would now incorrectly pop the stack,
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