Android APIs
public class

AbstractQueuedSynchronizer.ConditionObject

extends Object
implements Serializable Condition
java.lang.Object
   ↳ java.util.concurrent.locks.AbstractQueuedSynchronizer.ConditionObject

Class Overview

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 void await()
Implements interruptible condition wait.
final boolean await(long time, TimeUnit unit)
Implements timed 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<Thread> 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.
[Expand]
Inherited Methods
From class java.lang.Object
From interface java.util.concurrent.locks.Condition

Public Constructors

public AbstractQueuedSynchronizer.ConditionObject ()

Added in API level 1

Creates a new ConditionObject instance.

Public Methods

public final void await ()

Added in API level 1

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 InterruptedException.

Throws
InterruptedException

public final boolean await (long time, TimeUnit unit)

Added in API level 1

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.

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

public final long awaitNanos (long nanosTimeout)

Added in API level 1

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.

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

public final void awaitUninterruptibly ()

Added in API level 1

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)

Added in API level 1

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.

Parameters
deadline the absolute time to wait until
Returns
  • false if the deadline has elapsed upon return, else true
Throws
InterruptedException

public final void signal ()

Added in API level 1

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 ()

Added in API level 1

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 ()

Added in API level 1

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<Thread> getWaitingThreads ()

Added in API level 1

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 ()

Added in API level 1

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