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Added in API level 5

Summary: Protected Ctors | Protected Methods | Inherited Methods

AbstractOwnableSynchronizer

public abstract class AbstractOwnableSynchronizer
extends Object implements Serializable

java.lang.Object
↳	java.util.concurrent.locks.AbstractOwnableSynchronizer

Known direct subclasses

AbstractQueuedLongSynchronizer, AbstractQueuedSynchronizer

AbstractQueuedLongSynchronizer	A version of `AbstractQueuedSynchronizer` in which synchronization state is maintained as a `long`.
AbstractQueuedSynchronizer	Provides a framework for implementing blocking locks and related synchronizers (semaphores, events, etc) that rely on first-in-first-out (FIFO) wait queues.

A synchronizer that may be exclusively owned by a thread. This class provides a basis for creating locks and related synchronizers that may entail a notion of ownership. The AbstractOwnableSynchronizer class itself does not manage or use this information. However, subclasses and tools may use appropriately maintained values to help control and monitor access and provide diagnostics.

Summary

Protected constructors
`AbstractOwnableSynchronizer()` Empty constructor for use by subclasses.

Protected methods
`final Thread`	`getExclusiveOwnerThread()` Returns the thread last set by `setExclusiveOwnerThread`, or `null` if never set.
`final void`	`setExclusiveOwnerThread(Thread thread)` Sets the thread that currently owns exclusive access.

Inherited methods

From class


        
          java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long timeoutMillis, int nanos)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait(long timeoutMillis)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait()` Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

Protected constructors

AbstractOwnableSynchronizer

Added in API level 5

protected AbstractOwnableSynchronizer ()

Empty constructor for use by subclasses.

Protected methods

getExclusiveOwnerThread

Added in API level 5

protected final Thread getExclusiveOwnerThread ()

Returns the thread last set by setExclusiveOwnerThread, or null if never set. This method does not otherwise impose any synchronization or volatile field accesses.

Returns
`Thread`	the owner thread

setExclusiveOwnerThread

Added in API level 5

protected final void setExclusiveOwnerThread (Thread thread)

Sets the thread that currently owns exclusive access. A null argument indicates that no thread owns access. This method does not otherwise impose any synchronization or volatile field accesses.

Parameters
`thread`	`Thread`: the owner thread

Content and code samples on this page are subject to the licenses described in the Content License. Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.

Last updated 2026-08-03 UTC.

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