Java in a Nutshell, 5th Edition

Name

AbstractQueuedSynchronizer

Synopsis

This abstract class is a low-level utility. A concrete subclass can be used as a helper class for implementing the Lock interface or for implementing synchronizer utilities like the CountDownLatch class of java.util.concurrent. Subclasses must define tryAcquire( ), tryRelease( ), tryAcquireShared( ), tryReleaseShared( ), and isHeldExclusively.

Figure 16-104. java.util.concurrent.locks.AbstractQueuedSynchronizer

public abstract class AbstractQueuedSynchronizer implements Serializable {
// Protected Constructors
     protected AbstractQueuedSynchronizer( );  
// Nested Types
     public class ConditionObject implements Condition, Serializable; 
// Public Instance Methods
     public final void acquire(int arg);  
     public final void acquireInterruptibly(int arg) throws InterruptedException;  
     public final void acquireShared(int arg);  
     public final void acquireSharedInterruptibly(int arg) throws InterruptedException;  
     public final java.util.Collection<Thread> getExclusiveQueuedThreads( );  
     public final Thread getFirstQueuedThread( );  
     public final java.util.Collection<Thread> getQueuedThreads( );  
     public final int getQueueLength( );  
     public final java.util.Collection<Thread> getSharedQueuedThreads( );  
     public final java.util.Collection<Thread> getWaitingThreads(AbstractQueuedSynchronizer.
        ConditionObject condition);  
     public final int getWaitQueueLength(AbstractQueuedSynchronizer.ConditionObject ...