4632N/A/*
4632N/A * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
4632N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4632N/A *
4632N/A * This code is free software; you can redistribute it and/or modify it
4632N/A * under the terms of the GNU General Public License version 2 only, as
4632N/A * published by the Free Software Foundation. Oracle designates this
4632N/A * particular file as subject to the "Classpath" exception as provided
4632N/A * by Oracle in the LICENSE file that accompanied this code.
4632N/A *
4632N/A * This code is distributed in the hope that it will be useful, but WITHOUT
4632N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
4632N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
4632N/A * version 2 for more details (a copy is included in the LICENSE file that
4632N/A * accompanied this code).
4632N/A *
4632N/A * You should have received a copy of the GNU General Public License version
4632N/A * 2 along with this work; if not, write to the Free Software Foundation,
4632N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
4632N/A *
4632N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
4632N/A * or visit www.oracle.com if you need additional information or have any
4632N/A * questions.
4632N/A */
4632N/A
4632N/Apackage com.apple.concurrent;
4632N/A
4632N/Aimport java.util.List;
4632N/Aimport java.util.concurrent.*;
4632N/A
4632N/Aclass LibDispatchSerialQueue extends AbstractExecutorService {
4632N/A static final int RUNNING = 0;
4632N/A static final int SHUTDOWN = 1;
4632N/A// static final int STOP = 2; // not supported by GCD
4632N/A static final int TERMINATED = 3;
4632N/A
4632N/A final Object lock = new Object();
4632N/A LibDispatchQueue nativeQueueWrapper;
4632N/A volatile int runState;
4632N/A
4632N/A LibDispatchSerialQueue(final long queuePtr) {
4632N/A nativeQueueWrapper = new LibDispatchQueue(queuePtr);
4632N/A }
4632N/A
4632N/A @Override
4632N/A public void execute(final Runnable task) {
4632N/A if (nativeQueueWrapper == null) return;
4632N/A LibDispatchNative.nativeExecuteAsync(nativeQueueWrapper.ptr, task);
4632N/A }
4632N/A
4632N/A @Override
4632N/A public boolean isShutdown() {
4632N/A return runState != RUNNING;
4632N/A }
4632N/A
4632N/A @Override
4632N/A public boolean isTerminated() {
4632N/A return runState == TERMINATED;
4632N/A }
4632N/A
4632N/A @Override
4632N/A public void shutdown() {
4632N/A synchronized (lock) {
4632N/A if (runState != RUNNING) return;
4632N/A
4632N/A runState = SHUTDOWN;
4632N/A execute(new Runnable() {
4632N/A public void run() {
4632N/A synchronized (lock) {
4632N/A runState = TERMINATED;
4632N/A lock.notifyAll(); // for the benefit of awaitTermination()
4632N/A }
4632N/A }
4632N/A });
4632N/A nativeQueueWrapper = null;
4632N/A }
4632N/A }
4632N/A
4632N/A @Override
4632N/A public List<Runnable> shutdownNow() {
4632N/A shutdown();
4632N/A return null;
4632N/A }
4632N/A
4632N/A @Override
4632N/A public boolean awaitTermination(final long timeout, final TimeUnit unit) throws InterruptedException {
4632N/A if (runState == TERMINATED) return true;
4632N/A
4632N/A final long millis = unit.toMillis(timeout);
4632N/A if (millis <= 0) return false;
4632N/A
4632N/A synchronized (lock) {
4632N/A if (runState == TERMINATED) return true;
4632N/A lock.wait(timeout);
4632N/A if (runState == TERMINATED) return true;
4632N/A }
4632N/A
4632N/A return false;
4632N/A }
4632N/A}