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java.util.concurrent.locks
public class

java.util.concurrent.locks.AbstractQueuedSynchronizer.ConditionObject

java.lang.Object
java.util.concurrent.locks.AbstractQueuedSynchronizer.ConditionObject Serializable Condition

Condition implementation for a AbstractQueuedSynchronizer serving as the basis of a Lock implementation.

Method documentation for this class describes mechanics, not behavioral specifications from the point of view of Lock and Condition users. Exported versions of this class will in general need to be accompanied by documentation describing condition semantics that rely on those of the associated AbstractQueuedSynchronizer.

This class is Serializable, but all fields are transient, so deserialized conditions have no waiters.

Summary

Public Constructors

          AbstractQueuedSynchronizer.ConditionObject()
Creates a new ConditionObject instance.

Public Methods

    final    boolean  await(long time, TimeUnit unit)
Implements timed condition wait.
    final    void  await()
Implements interruptible condition wait.
    final    long  awaitNanos(long nanosTimeout)
Implements timed condition wait.
    final    void  awaitUninterruptibly()
Implements uninterruptible condition wait.
    final    boolean  awaitUntil(Date deadline)
Implements absolute timed condition wait.
    final    void  signal()
Moves the longest-waiting thread, if one exists, from the wait queue for this condition to the wait queue for the owning lock.
    final    void  signalAll()
Moves all threads from the wait queue for this condition to the wait queue for the owning lock.

Protected Methods

    final    int  getWaitQueueLength()
Returns an estimate of the number of threads waiting on this condition.
    final    Collection  getWaitingThreads()
Returns a collection containing those threads that may be waiting on this Condition.
    final    boolean  hasWaiters()
Queries whether any threads are waiting on this condition.
Methods inherited from class java.lang.Object
Methods inherited from interface java.util.concurrent.locks.Condition

Details

Public Constructors

public AbstractQueuedSynchronizer.ConditionObject()

Creates a new ConditionObject instance.

Public Methods

public final boolean await(long time, TimeUnit unit)

Implements timed condition wait.
  1. If current thread is interrupted, throw InterruptedException
  2. Save lock state returned by getState()
  3. Invoke release(int) with saved state as argument, throwing IllegalMonitorStateException if it fails.
  4. Block until signalled, interrupted, or timed out
  5. Reacquire by invoking specialized version of acquire(int) with saved state as argument.
  6. If interrupted while blocked in step 4, throw InterruptedException
  7. If timed out while blocked in step 4, return false, else true

Throws

InterruptedException

public final void await()

Implements interruptible condition wait.
  1. If current thread is interrupted, throw InterruptedException
  2. Save lock state returned by getState()
  3. Invoke release(int) with saved state as argument, throwing IllegalMonitorStateException if it fails.
  4. Block until signalled or interrupted
  5. Reacquire by invoking specialized version of acquire(int) with saved state as argument.
  6. If interrupted while blocked in step 4, throw exception

Throws

InterruptedException

public final long awaitNanos(long nanosTimeout)

Implements timed condition wait.
  1. If current thread is interrupted, throw InterruptedException
  2. Save lock state returned by getState()
  3. Invoke release(int) with saved state as argument, throwing IllegalMonitorStateException if it fails.
  4. Block until signalled, interrupted, or timed out
  5. Reacquire by invoking specialized version of acquire(int) with saved state as argument.
  6. If interrupted while blocked in step 4, throw InterruptedException

Throws

InterruptedException

public final void awaitUninterruptibly()

Implements uninterruptible condition wait.
  1. Save lock state returned by getState()
  2. Invoke release(int) with saved state as argument, throwing IllegalMonitorStateException if it fails.
  3. Block until signalled
  4. Reacquire by invoking specialized version of acquire(int) with saved state as argument.

public final boolean awaitUntil(Date deadline)

Implements absolute timed condition wait.
  1. If current thread is interrupted, throw InterruptedException
  2. Save lock state returned by getState()
  3. Invoke release(int) with saved state as argument, throwing IllegalMonitorStateException if it fails.
  4. Block until signalled, interrupted, or timed out
  5. Reacquire by invoking specialized version of acquire(int) with saved state as argument.
  6. If interrupted while blocked in step 4, throw InterruptedException
  7. If timed out while blocked in step 4, return false, else true

Throws

InterruptedException

public final void signal()

Moves the longest-waiting thread, if one exists, from the wait queue for this condition to the wait queue for the owning lock.

Throws

IllegalMonitorStateException if isHeldExclusively() returns false

public final void signalAll()

Moves all threads from the wait queue for this condition to the wait queue for the owning lock.

Throws

IllegalMonitorStateException if isHeldExclusively() returns false

Protected Methods

protected final int getWaitQueueLength()

Returns an estimate of the number of threads waiting on this condition. Implements getWaitQueueLength(AbstractQueuedSynchronizer.ConditionObject)

Returns

  • the estimated number of waiting threads.

Throws

IllegalMonitorStateException if isHeldExclusively() returns false

protected final Collection getWaitingThreads()

Returns a collection containing those threads that may be waiting on this Condition. Implements getWaitingThreads(AbstractQueuedSynchronizer.ConditionObject)

Returns

  • the collection of threads

Throws

IllegalMonitorStateException if isHeldExclusively() returns false

protected final boolean hasWaiters()

Queries whether any threads are waiting on this condition. Implements hasWaiters(AbstractQueuedSynchronizer.ConditionObject)

Returns

  • true if there are any waiting threads.

Throws

IllegalMonitorStateException if isHeldExclusively() returns false
Build m5-rc15i - 10 Jun 2008 13:54