Top Description Fields Constructors Methods

io.netty.util.internal.shaded.org.jctools.util

public Class UnsafeAccess

Class Inheritance

extends Object

java.lang.Object
io.netty.util.internal.shaded.org.jctools.util.UnsafeAccess

Annotations

@InternalAPI

Imports

sun.misc.Unsafe, java.lang.reflect.Constructor, .Field, java.util.concurrent.atomic.AtomicReferenceArray, .AtomicReferenceFieldUpdater

Why should we resort to using Unsafe?

To construct class fields which allow volatile/ordered/plain access: This requirement is covered by AtomicReferenceFieldUpdater and similar but their performance is arguably worse than the DIY approach (depending on JVM version) while Unsafe intrinsification is a far lesser challenge for JIT compilers.
To construct flavors of AtomicReferenceArray.
Other use cases exist but are not present in this library yet.

Author: nitsanw

Field Summary

Modifier and Type	Field and Description
public static final boolean	SUPPORTS_GET_AND_ADD_LONG
public static final boolean	SUPPORTS_GET_AND_SET_REF
public static final Unsafe	UNSAFE

Constructor Summary

Access	Constructor and Description
public	UnsafeAccess()

Method Summary

Modifier and Type	Method and Description
public static long	fieldOffset(Class<T> clz, String fieldName)
private static Unsafe	getUnsafe()
private static boolean	hasGetAndAddLongSupport()
private static boolean	hasGetAndSetSupport()

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

Field Detail

SUPPORTS_GET_AND_ADD_LONG	back to summary
public static final boolean SUPPORTS_GET_AND_ADD_LONG

SUPPORTS_GET_AND_SET_REF	back to summary
public static final boolean SUPPORTS_GET_AND_SET_REF

UNSAFE	back to summary
public static final Unsafe UNSAFE

Constructor Detail

UnsafeAccess	back to summary
public UnsafeAccess()

Method Detail

fieldOffset	back to summary
public static long fieldOffset(Class<T> clz, String fieldName) throws RuntimeException

getUnsafe	back to summary
private static Unsafe getUnsafe()

hasGetAndAddLongSupport	back to summary
private static boolean hasGetAndAddLongSupport()

hasGetAndSetSupport	back to summary
private static boolean hasGetAndSetSupport()