com.oracle.svm.core.util

Class AtomicWord<T extends org.graalvm.word.WordBase>

java.lang.Object

com.oracle.svm.core.util.AtomicWord<T>

Direct Known Subclasses:

AtomicUnsigned

public class AtomicWord<T extends org.graalvm.word.WordBase>
extends Object

A word value that may be updated atomically. See the java.util.concurrent.atomic package specification for description of the properties of atomic variables. Similar to AtomicReference, but for word types. A dedicated implementation is necessary because Object and word types cannot be mixed.

Field Summary

Fields

Modifier and Type	Field and Description
protected AtomicLong	value For simplicity, we convert the word value to a long and delegate to existing atomic operations.

Constructor Summary

Constructors

Constructor and Description
AtomicWord() Creates a new AtomicWord with initial value WordFactory.zero().

Method Summary

Modifier and Type	Method and Description
boolean	compareAndSet(T expect, T update) Atomically sets the value to the given updated value if the current value == the expected value.
T	get() Gets the current value.
T	getAndSet(T newValue) Atomically sets to the given value and returns the old value.
void	set(T newValue) Sets to the given value.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

value

protected final AtomicLong value

For simplicity, we convert the word value to a long and delegate to existing atomic operations.

Constructor Detail

AtomicWord

public AtomicWord()

Creates a new AtomicWord with initial value WordFactory.zero().

Method Detail

get

public final T get()

Gets the current value.

Returns:

the current value

set

public final void set(T newValue)

Sets to the given value.

Parameters:

newValue - the new value

getAndSet

public final T getAndSet(T newValue)

Atomically sets to the given value and returns the old value.

Parameters:

newValue - the new value

Returns:

the previous value

compareAndSet

public final boolean compareAndSet(T expect,
                                   T update)

Atomically sets the value to the given updated value if the current value == the expected value.

Parameters:

expect - the expected value

update - the new value

Returns:

true if successful. False return indicates that the actual value was not equal to the expected value.