--- /dev/null	2016-02-02 08:28:09.597457739 +0100
+++ new/src/java.base/share/classes/java/util/Signal.java	2016-02-02 16:50:24.323989761 +0100
@@ -0,0 +1,367 @@
+/*
+ * 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.BiConsumer;
+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(BiConsumer)  Registering} a handler replaces the
+ * current handler with the provided handler. Provided handler receives, when
+ * invoked, a {@code Signal} instance being handler and a {@code Runnable} object
+ * representing the replaced handler, which may be invoked to chain the handling
+ * of the signal.
+ * {@link Signal#unregister(BiConsumer) 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
+ * BiConsumer<Signal, Runnable> handler = (s, r) -> {
+ * ... // handle SIGINT
+ * ... // may invoke r.run() as part to chain previous handler
+ * };
+ * Signal.of("SIGINT").register(handler);
+ * }</pre>
+ * <p>
+ * Signal is a <a href="{@docRoot}/java/lang/doc-files/ValueBased.html">value-based</a>
+ * class; use of identity-sensitive operations (including reference equality
+ * ({@code ==}), identity hash code, or synchronization) on instances of
+ * {@code Signal} may have unpredictable results and should be avoided.
+ * The {@code equals} method should be used for comparisons.
+ * <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) {
+        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 HandlerChain handlerChain;
+    long savedNativeHandler;
+
+    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, but can
+     * invoke replaced handler by invoking the passed-in {@code Runnable}
+     * object.
+     *
+     * @param handler a signal handler
+     * @throws UnsupportedOperationException if handling of the signal is
+     *                                       not supported by the implementation
+     */
+    public synchronized void register(BiConsumer<Signal, Runnable> handler) {
+        HandlerChain oldChain = handlerChain;
+        handlerChain = new HandlerChain.Java(oldChain, handler);
+        if (oldChain == null) {
+            // set native to dispatch to Singnal.dispatch()
+            // and save top-level native handler
+            savedNativeHandler = handle1(2);
+        } else if (oldChain instanceof HandlerChain.Native) {
+            // set native to dispatch to Signal.dispatch() only
+            // (the old native handler is saved in oldChain)
+            handle1(2);
+        }
+    }
+
+    /**
+     * 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(BiConsumer<Signal, Runnable> handler) {
+        HandlerChain oldChain = handlerChain;
+        if (oldChain instanceof HandlerChain.Java &&
+            ((HandlerChain.Java) oldChain).handler == handler) {
+            if (oldChain.next == null) {
+                // restore saved top-level native handler
+                handle1(savedNativeHandler);
+            } else if (oldChain.next instanceof HandlerChain.Native) {
+                // restore next native handler
+                handle1(((HandlerChain.Native) oldChain.next).nativeHandler);
+            }
+            handlerChain = oldChain.next;
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    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) {
+            HandlerChain handlerChain = signal.handlerChain;
+            if (handlerChain != null) {
+                new InnocuousThread(() -> handlerChain.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 abstract class HandlerChain implements Consumer<Signal> {
+        final HandlerChain next;
+
+        HandlerChain(HandlerChain next) {
+            this.next = next;
+        }
+
+        @Override
+        public void accept(Signal signal) {
+            if (next != null) {
+                next.accept(signal);
+            }
+        }
+
+        private static class Java extends HandlerChain {
+            final BiConsumer<Signal, Runnable> handler;
+
+            Java(HandlerChain next, BiConsumer<Signal, Runnable> handler) {
+                super(next);
+                this.handler = handler;
+            }
+
+            @Override
+            public void accept(Signal signal) {
+                handler.accept(signal, () -> super.accept(signal));
+            }
+        }
+
+        private static class Native extends HandlerChain {
+            final long nativeHandler;
+
+            Native(HandlerChain next, long nativeHandler) {
+                super(next);
+                this.nativeHandler = nativeHandler;
+            }
+
+            @Override
+            public void accept(Signal signal) {
+                throw new UnsupportedOperationException(
+                    "Can't invoke native handler from Java");
+            }
+        }
+    }
+
+    private static final class NativeImpl extends Signal implements NativeSignal {
+        NativeImpl(String name, int number) {
+            super(name, number);
+        }
+
+        @Override
+        public synchronized void registerNative(long nativeHandler) {
+            HandlerChain oldChain = handlerChain;
+            handlerChain = new HandlerChain.Native(oldChain, nativeHandler);
+            if (oldChain == null) {
+                // set native to given native handler
+                // and save top-level native handler
+                savedNativeHandler = handle1(nativeHandler);
+            } else {
+                // set native to dispatch to given native handler only
+                handle1(nativeHandler);
+            }
+        }
+
+        @Override
+        public synchronized boolean unregisterNative(long nativeHandler) {
+            HandlerChain oldChain = handlerChain;
+            if (oldChain instanceof HandlerChain.Native &&
+                ((HandlerChain.Native) oldChain).nativeHandler == nativeHandler) {
+                if (oldChain.next == null) {
+                    // restore saved top-level native handler
+                    handle1(savedNativeHandler);
+                } else if (oldChain.next instanceof HandlerChain.Native) {
+                    // restore next native handler
+                    handle1(((HandlerChain.Native) oldChain.next).nativeHandler);
+                } else {
+                    assert oldChain.next instanceof HandlerChain.Java;
+                    // restore native to dispatch to Java
+                    handle1(2L);
+                }
+                handlerChain = oldChain.next;
+                return true;
+            } else {
+                return false;
+            }
+        }
+    }
+}