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Not portable part of chicory. This package should be as small as possible. Classes used for talking to operating system. Part of chicory.

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/*
 * Copyright (c) 2014, Victor Nazarov 
 * 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 the Victor Nazarov 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  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 com.github.sviperll.environment;

import sun.misc.Signal;
import sun.misc.SignalHandler;

/**
 *
 * @author Victor Nazarov <[email protected]>
 */
public class SignalWaiter {
    private final Object lock = new Object();
    private final SignalWaiterHandler handler = new SignalWaiterHandler();
    private boolean isReceived = false;

    public void waitForSignal() {
        synchronized (lock) {
            while (!isReceived) {
                try {
                    lock.wait();
                } catch (InterruptedException ex) {
                }
            }
        }
    }

    public boolean isReceived() {
        synchronized (lock) {
            return isReceived;
        }
    }

    public void expect(String signal) {
        Signal.handle(new Signal(signal), handler);
    }

    private class SignalWaiterHandler implements SignalHandler {
        @Override
        public void handle(Signal sig) {
            synchronized (lock) {
                isReceived = true;
                lock.notifyAll();
            }
        }
    }
}