67 lines
2.7 KiB
Java
67 lines
2.7 KiB
Java
/*
|
|
* Copyright (c) 2002-2011 LWJGL Project
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are
|
|
* met:
|
|
*
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
*
|
|
* * Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* * Neither the name of 'LWJGL' nor the names of
|
|
* its contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
|
|
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
|
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
|
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
|
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
package org.lwjgl.util.mapped;
|
|
|
|
import java.lang.annotation.ElementType;
|
|
import java.lang.annotation.Retention;
|
|
import java.lang.annotation.RetentionPolicy;
|
|
import java.lang.annotation.Target;
|
|
|
|
/**
|
|
* When this annotation is used on a field, automatic cache-line-sized padding
|
|
* will be inserted around the field. This is useful in multi-threaded algorithms
|
|
* to avoid cache line false sharing. The annotation defaults to padding after
|
|
* the field, but can be changed to before or both before and after. It can be
|
|
* applied to both mapped object fields and POJO primitive fields.
|
|
*
|
|
* @author Spasi
|
|
*/
|
|
@Retention(RetentionPolicy.RUNTIME)
|
|
@Target(ElementType.FIELD)
|
|
public @interface CacheLinePad {
|
|
|
|
/**
|
|
* When true, cache-line padding will be inserted before the field.
|
|
*
|
|
* @return true if cache-line padding will be inserted before the field
|
|
*/
|
|
boolean before() default false;
|
|
|
|
/**
|
|
* When true, cache-line padding will be inserted after the field.
|
|
*
|
|
* @return true if cache-line padding will be inserted after the field
|
|
*/
|
|
boolean after() default true;
|
|
|
|
}
|