| /* |
| * Copyright (c) 2011, 2012, 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 com.apple.concurrent; |
| |
| import java.util.List; |
| import java.util.concurrent.*; |
| |
| class LibDispatchSerialQueue extends AbstractExecutorService { |
| static final int RUNNING = 0; |
| static final int SHUTDOWN = 1; |
| // static final int STOP = 2; // not supported by GCD |
| static final int TERMINATED = 3; |
| |
| final Object lock = new Object(); |
| LibDispatchQueue nativeQueueWrapper; |
| volatile int runState; |
| |
| LibDispatchSerialQueue(final long queuePtr) { |
| nativeQueueWrapper = new LibDispatchQueue(queuePtr); |
| } |
| |
| @Override |
| public void execute(final Runnable task) { |
| if (nativeQueueWrapper == null) return; |
| LibDispatchNative.nativeExecuteAsync(nativeQueueWrapper.ptr, task); |
| } |
| |
| @Override |
| public boolean isShutdown() { |
| return runState != RUNNING; |
| } |
| |
| @Override |
| public boolean isTerminated() { |
| return runState == TERMINATED; |
| } |
| |
| @Override |
| public void shutdown() { |
| synchronized (lock) { |
| if (runState != RUNNING) return; |
| |
| runState = SHUTDOWN; |
| execute(new Runnable() { |
| public void run() { |
| synchronized (lock) { |
| runState = TERMINATED; |
| lock.notifyAll(); // for the benefit of awaitTermination() |
| } |
| } |
| }); |
| nativeQueueWrapper = null; |
| } |
| } |
| |
| @Override |
| public List<Runnable> shutdownNow() { |
| shutdown(); |
| return null; |
| } |
| |
| @Override |
| public boolean awaitTermination(final long timeout, final TimeUnit unit) throws InterruptedException { |
| if (runState == TERMINATED) return true; |
| |
| final long millis = unit.toMillis(timeout); |
| if (millis <= 0) return false; |
| |
| synchronized (lock) { |
| if (runState == TERMINATED) return true; |
| lock.wait(timeout); |
| if (runState == TERMINATED) return true; |
| } |
| |
| return false; |
| } |
| } |