--- /dev/null	2016-02-02 08:28:09.597457739 +0100
+++ new/src/java.base/share/classes/java/util/Signal.java	2016-02-02 22:57:28.860522302 +0100
@@ -0,0 +1,342 @@
+/*
+ * Copyright (c) 1998, 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package java.util;
+
+import jdk.internal.misc.NativeSignal;
+import sun.misc.InnocuousThread;
+
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+import java.util.function.Consumer;
+import java.util.function.Function;
+
+/**
+ * Signal provides support for responding to and raising platform signals.
+ * Each signal has a current signal handler.
+ * The signals supported are implementation and operating system specific.
+ * <p>
+ * {@link Signal#register(Consumer)  Registering} a handler replaces the
+ * current handler with the provided handler.
+ * {@link Signal#unregister(Consumer) Unregistering} a handler restores the
+ * signal handling to the state before registering the handler.
+ * The signal handler is initially registered for the signals
+ * {@code SIGINT}, {@code SIGTERM}, and {@code SIGHUP}.
+ * The system registered handler terminates the Java Runtime
+ * by invoking {@link System#exit System.exit} with a
+ * value of {@code 128 + the signal number}. Other signals are ignored.
+ * Handlers for signals that are unknown or reserved by the
+ * Java implementation can not be registered.
+ * <p>
+ * Handling and raising signals are sensitive operations.  Access to
+ * Signal instances is restricted via {@code RuntimePermission("handleSignal")}
+ * if a SecurityManager is installed.
+ * <p>
+ * Common signal names that follow ANSI/ISO C conventions include:
+ * <ul>
+ * <li>SIGINT - Interrupt as if the user typed {@code Ctrl-C}
+ * <li>SIGTERM - A request for normal termination
+ * <li>SIGHUP - The process is no longer connected to a controlling terminal
+ * </ul>
+ * <p>
+ * Signal objects are created based on their names. For example:
+ * <blockquote>{@code
+ *     Signal s = Signal.of("SIGINT");
+ * }</blockquote>
+ * constructs a Signal for {@code SIGINT}, which is
+ * typically produced when the user presses {@code Ctrl-C}.
+ * <p>
+ * To handle a signal a handler is registered for the Signal.
+ * For example, to respond to {@code Ctrl-C}:
+ * <pre>{@code
+ * Consumer<Signal> handler = s -> {
+ * ... // handle SIGINT
+ * };
+ * Signal.of("SIGINT").register(handler);
+ * }</pre>
+ * <p>
+ * Signal is an interned object. There is a single instance for a particular
+ * signal name.
+ * <p>
+ * Unless otherwise noted, passing a {@code null} argument to any method in this
+ * class causes a {@link java.lang.NullPointerException NullPointerException}
+ * to be thrown.
+ * <p>
+ *
+ *
+ * @implNote Signal handling is asynchronous to the native signal mechanisms.
+ * The implementation handles the native signal and signals a Java Thread to
+ * deliver the signal to the registered handler.
+ * Since the Java signal handler runs in a newly created thread,  it may not be
+ * executed until some time after the native signal handler returns.
+ *
+ * @since 9
+ */
+public class Signal {
+
+    /**
+     * Returns the named Signal.
+     *
+     * @param name the name of the signal
+     * @return the named Signal
+     * @throws UnsupportedOperationException if the signal is unknown or reserved
+     * @throws SecurityException        if a SecurityManager is installed and
+     *                 the {@code RuntimePermission("handleSignal")} is denied
+     */
+    public static Signal of(String name) {
+        Objects.requireNonNull(name, "name");
+
+        Signal signal = SIGNAL_BY_NAME.get(name);
+        if (signal != null) {
+            return signal;
+        }
+
+        int number;
+        if (!name.startsWith("SIG") || name.length() <= 3 ||
+            (number = findSignal0(name.substring(3))) < 0) {
+            throw new UnsupportedOperationException("Unknown signal: " + name);
+        }
+
+        signal = SIGNAL_BY_NUMBER.computeIfAbsent(
+            number,
+            new Function<Integer, Signal>() {
+                @Override
+                public Signal apply(Integer number) {
+                    return new Signal.NativeImpl(name, number);
+                }
+            }
+        );
+
+        SIGNAL_BY_NAME.putIfAbsent(name, signal);
+
+        return signal;
+    }
+
+    private static final ConcurrentMap<String, Signal> SIGNAL_BY_NAME = new ConcurrentHashMap<>(4);
+    private static final ConcurrentMap<Integer, Signal> SIGNAL_BY_NUMBER = new ConcurrentHashMap<>(4);
+
+    private final String name;
+    private final int number;
+    volatile HandlerNode handlerNode;
+    long topNativeHandler;
+
+    Signal(String name, int number) {
+        this.name = name;
+        this.number = number;
+    }
+
+    /**
+     * Returns the signal name.
+     * Signal names are implementation specific.
+     *
+     * @return the signal name
+     */
+    public String name() { return name; }
+
+    /**
+     * Returns the signal number.
+     * Signal numbers are implementation specific.
+     *
+     * @return the signal number
+     */
+    public int number() { return number; }
+
+    /**
+     * Raises the signal in the current process.
+     * A consumer must have been registered for the signal.
+     * @throws UnsupportedOperationException if handling of the signal is
+     *         not supported by the implementation
+     */
+    public void raise() { raise0(number); }
+
+    /**
+     * Register a handler of the Signal.
+     * Given handler replaces current signal handler.
+     *
+     * @param handler a signal handler
+     * @throws UnsupportedOperationException if handling of the signal is
+     *                                       not supported by the implementation
+     */
+    public synchronized void register(Consumer<Signal> handler) {
+        Objects.requireNonNull(handler, "handler");
+        HandlerNode oldNode = handlerNode;
+        HandlerNode newNode = new HandlerNode(oldNode, handler);
+        replace(oldNode, newNode);
+    }
+
+    /**
+     * Unregister a handler of the Signal.
+     * If given handler is the most recently registered handler for the signal,
+     * signal handling is restored to the state prior to registering given handler
+     * and the method returns {@code true}; otherwise the currently registered
+     * handler is left unchanged and {@code false} is returned.
+     *
+     * @param handler a signal handler; non-null
+     * @return {@code true} if given handler was the most recently registered handler
+     *         and was unregistered, otherwise {@code false}
+     */
+    public synchronized boolean unregister(Consumer<Signal> handler) {
+        Objects.requireNonNull(handler, "handler");
+        HandlerNode oldNode = handlerNode;
+        if (oldNode != null && !oldNode.isNative() && oldNode.handler == handler) {
+            replace(oldNode, oldNode.previous);
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    void replace(HandlerNode oldNode, HandlerNode newNode) {
+        assert Thread.holdsLock(this);
+        if ((oldNode == null || oldNode.isNative()) &&
+            (newNode != null && !newNode.isNative())) {
+            // when transitioning from native to java handler, we must
+            // set handlerNode before setting native handler to avoid
+            // possible race...
+            handlerNode = newNode;
+            long oldNativeHandler;
+            try {
+                oldNativeHandler = handle1(newNode.nativeHandler);
+            } catch (RuntimeException | Error e) {
+                // ...but must restore it if unsuccessful
+                handlerNode = oldNode;
+                throw e;
+            }
+            if (oldNode == null) {
+                // save top-level native handler if replacing the null oldNode
+                topNativeHandler = oldNativeHandler;
+            }
+        } else {
+            // when transitioning from java to native handler, we must
+            // set native handler before setting handlerNode to avoid
+            // possible race; when transitioning from one native handler to another
+            // or when transitioning from one java handler to another,
+            // the order is not important...
+            handle1(newNode == null
+                    ? topNativeHandler // restore top-level native handler if
+                                       // replacing with null newNode
+                    : newNode.nativeHandler);
+            handlerNode = newNode;
+        }
+    }
+
+    long handle1(long nativeHandler) {
+        long oldNativeHandler = handle0(number, nativeHandler);
+        if (oldNativeHandler == -1L) {
+            throw new UnsupportedOperationException(
+                "Signal already used by VM or OS: " + name);
+        }
+        return oldNativeHandler;
+    }
+
+    /*
+     * Called by the VM to execute Java signal handlers.
+     */
+    private static void dispatch(int number) {
+        Signal signal = SIGNAL_BY_NUMBER.get(number);
+        if (signal != null) {
+            HandlerNode handlerNode = signal.handlerNode;
+            if (handlerNode != null) {
+                Consumer<Signal> handler = handlerNode.handler;
+                if (handler != null) {
+                    new InnocuousThread(() -> handler.accept(signal))
+                        .start();
+                }
+            }
+        }
+    }
+
+    /**
+     * Find the signal number, given a name.
+     *
+     * @param sigName the signal name
+     * @return the signal number or -1 for unknown signals.
+     */
+    private static native int findSignal0(String sigName);
+
+    /**
+     * Registers a native signal handler, and returns the old handler.
+     * Handler values:
+     *   0     default handler
+     *   1     ignore the signal
+     *   2     call back to Signal.dispatch
+     *   other arbitrary native signal handlers
+     * @param nativeH the index or address of the new signal handler
+     * @return the previous index or address
+     */
+    private static native long handle0(int sig, long nativeH);
+
+    /**
+     * Raise a given signal number.
+     * @param sig the signal number to raise
+     */
+    private static native void raise0(int sig);
+
+
+    private static final class HandlerNode {
+        final HandlerNode previous;
+        final Consumer<Signal> handler;
+        final long nativeHandler;
+
+        HandlerNode(HandlerNode previous, Consumer<Signal> handler) {
+            this.previous = previous;
+            this.handler = handler;
+            this.nativeHandler = 2L;
+        }
+
+        HandlerNode(HandlerNode previous, long nativeHandler) {
+            this.previous = previous;
+            this.handler = null;
+            this.nativeHandler = nativeHandler;
+        }
+
+        boolean isNative() {
+            return handler == null;
+        }
+    }
+
+    private static final class NativeImpl extends Signal implements NativeSignal {
+        NativeImpl(String name, int number) {
+            super(name, number);
+        }
+
+        @Override
+        public synchronized void register(long nativeHandler) {
+            HandlerNode oldNode = handlerNode;
+            HandlerNode newNode = new HandlerNode(oldNode, nativeHandler);
+            replace(oldNode, newNode);
+        }
+
+        @Override
+        public synchronized boolean unregister(long nativeHandler) {
+            HandlerNode oldNode = handlerNode;
+            if (oldNode != null && oldNode.isNative() && oldNode.nativeHandler == nativeHandler) {
+                replace(oldNode, oldNode.previous);
+                return true;
+            } else {
+                return false;
+            }
+        }
+    }
+}