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//
//  ========================================================================
//  Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package org.eclipse.jetty.util;

import java.security.AccessController;
import java.security.PrivilegedAction;

/**
 * {@link MemoryUtils} provides an abstraction over memory properties and operations.
 * 

*/ public class MemoryUtils { private static final int cacheLineBytes; static { final int defaultValue = 64; int value = defaultValue; try { value = Integer.parseInt(AccessController.doPrivileged(new PrivilegedAction() { @Override public String run() { return System.getProperty("org.eclipse.jetty.util.cacheLineBytes", String.valueOf(defaultValue)); } })); } catch (Exception ignored) { } cacheLineBytes = value; } private MemoryUtils() { } public static int getCacheLineBytes() { return cacheLineBytes; } public static int getIntegersPerCacheLine() { return getCacheLineBytes() >> 2; } public static int getLongsPerCacheLine() { return getCacheLineBytes() >> 3; } }





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