Class AbstractQueuedSynchronizer. ConditionObject

Constructor Detail

• AbstractQueuedSynchronizer.ConditionObject

  public AbstractQueuedSynchronizer.ConditionObject()

  Creates a new ConditionObject instance.

Method Detail

• signal

  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.

  Specified by:

  signal in interface Condition

  Throws:

  IllegalMonitorStateException - if AbstractQueuedSynchronizer.isHeldExclusively() returns false

• signalAll

  public final void signalAll()

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

  Specified by:

  signalAll in interface Condition

  Throws:

  IllegalMonitorStateException - if AbstractQueuedSynchronizer.isHeldExclusively() returns false

• awaitUninterruptibly

  public final void awaitUninterruptibly()

  Implements uninterruptible condition wait.

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

  Specified by:

  awaitUninterruptibly in interface Condition

• await

  public final void await()
                   throws InterruptedException

  Implements interruptible condition wait.

  1. If current thread is interrupted, throw InterruptedException.
  2. Save lock state returned by AbstractQueuedSynchronizer.getState().
  3. Invoke AbstractQueuedSynchronizer.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 AbstractQueuedSynchronizer.acquire(int) with saved state as argument.
  6. If interrupted while blocked in step 4, throw InterruptedException.

  Specified by:

  await in interface Condition

  Throws:

  InterruptedException - if the current thread is interrupted (and interruption of thread suspension is supported)

• awaitNanos

  public final long awaitNanos(long nanosTimeout)
                        throws InterruptedException

  Implements timed condition wait.

  1. If current thread is interrupted, throw InterruptedException.
  2. Save lock state returned by AbstractQueuedSynchronizer.getState().
  3. Invoke AbstractQueuedSynchronizer.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 AbstractQueuedSynchronizer.acquire(int) with saved state as argument.
  6. If interrupted while blocked in step 4, throw InterruptedException.

  Specified by:

  awaitNanos in interface Condition

  Parameters:

  nanosTimeout - the maximum time to wait, in nanoseconds

  Returns:

  an estimate of the nanosTimeout value minus the time spent waiting upon return from this method. A positive value may be used as the argument to a subsequent call to this method to finish waiting out the desired time. A value less than or equal to zero indicates that no time remains.

  Throws:

  InterruptedException - if the current thread is interrupted (and interruption of thread suspension is supported)

• awaitUntil

  public final boolean awaitUntil(Date deadline)
                           throws InterruptedException

  Implements absolute timed condition wait.

  1. If current thread is interrupted, throw InterruptedException.
  2. Save lock state returned by AbstractQueuedSynchronizer.getState().
  3. Invoke AbstractQueuedSynchronizer.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 AbstractQueuedSynchronizer.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.

  Specified by:

  awaitUntil in interface Condition

  Parameters:

  deadline - the absolute time to wait until

  Returns:

  false if the deadline has elapsed upon return, else true

  Throws:

  InterruptedException - if the current thread is interrupted (and interruption of thread suspension is supported)

• await

  public final boolean await(long time,
              TimeUnit unit)
                      throws InterruptedException

  Implements timed condition wait.

  1. If current thread is interrupted, throw InterruptedException.
  2. Save lock state returned by AbstractQueuedSynchronizer.getState().
  3. Invoke AbstractQueuedSynchronizer.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 AbstractQueuedSynchronizer.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.

  Specified by:

  await in interface Condition

  Parameters:

  time - the maximum time to wait

  unit - the time unit of the time argument

  Returns:

  false if the waiting time detectably elapsed before return from the method, else true

  Throws:

  InterruptedException - if the current thread is interrupted (and interruption of thread suspension is supported)

• hasWaiters

  protected final boolean hasWaiters()

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

  Returns:

  true if there are any waiting threads

  Throws:

  IllegalMonitorStateException - if AbstractQueuedSynchronizer.isHeldExclusively() returns false

• getWaitQueueLength

  protected final int getWaitQueueLength()

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

  Returns:

  the estimated number of waiting threads

  Throws:

  IllegalMonitorStateException - if AbstractQueuedSynchronizer.isHeldExclusively() returns false

• getWaitingThreads

  protected final Collection<Thread> getWaitingThreads()

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

  Returns:

  the collection of threads

  Throws:

  IllegalMonitorStateException - if AbstractQueuedSynchronizer.isHeldExclusively() returns false