Importing upstream Jetty jetty-9.2.1.v20140609

[gigi.git] / lib / jetty / org / eclipse / jetty / util / Atomics.java

diff --git a/lib/jetty/org/eclipse/jetty/util/Atomics.java b/lib/jetty/org/eclipse/jetty/util/Atomics.java
new file mode 100644 (file)
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+++ b/lib/jetty/org/eclipse/jetty/util/Atomics.java
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+//
+//  ========================================================================
+//  Copyright (c) 1995-2014 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.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicLong;
+
+public class Atomics
+{
+    private Atomics()
+    {
+    }
+
+    public static void updateMin(AtomicLong currentMin, long newValue)
+    {
+        long oldValue = currentMin.get();
+        while (newValue < oldValue)
+        {
+            if (currentMin.compareAndSet(oldValue, newValue))
+                break;
+            oldValue = currentMin.get();
+        }
+    }
+
+    public static void updateMax(AtomicLong currentMax, long newValue)
+    {
+        long oldValue = currentMax.get();
+        while (newValue > oldValue)
+        {
+            if (currentMax.compareAndSet(oldValue, newValue))
+                break;
+            oldValue = currentMax.get();
+        }
+    }
+
+    public static void updateMin(AtomicInteger currentMin, int newValue)
+    {
+        int oldValue = currentMin.get();
+        while (newValue < oldValue)
+        {
+            if (currentMin.compareAndSet(oldValue, newValue))
+                break;
+            oldValue = currentMin.get();
+        }
+    }
+
+    public static void updateMax(AtomicInteger currentMax, int newValue)
+    {
+        int oldValue = currentMax.get();
+        while (newValue > oldValue)
+        {
+            if (currentMax.compareAndSet(oldValue, newValue))
+                break;
+            oldValue = currentMax.get();
+        }
+    }
+}