Mercurial > projects > dwt-addons
view dwtx/core/internal/jobs/Semaphore.d @ 122:9d0585bcb7aa
Add core.jobs package
author | Frank Benoit <benoit@tionex.de> |
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date | Tue, 12 Aug 2008 02:34:21 +0200 |
parents | |
children | 862b05e0334a |
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/******************************************************************************* * Copyright (c) 2003, 2006 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * IBM Corporation - initial API and implementation * Port to the D programming language: * Frank Benoit <benoit@tionex.de> *******************************************************************************/ module dwtx.core.internal.jobs.Semaphore; import tango.core.Thread; import tango.core.sync.Mutex; import tango.core.sync.Condition; import dwt.dwthelper.utils; import dwt.dwthelper.Runnable; import tango.text.convert.Format; public class Semaphore { protected long notifications; protected Thread runnable; private Mutex mutex; private Condition condition; public this(Thread runnable) { mutex = new Mutex; condition = new Condition(mutex); this.runnable = runnable; notifications = 0; } /** * Attempts to acquire this semaphore. Returns true if it was successfully acquired, * and false otherwise. */ public bool acquire(long delay) { synchronized(mutex){ implMissing( __FILE__, __LINE__ ); // DWT // if (Thread.interrupted()) // throw new InterruptedException(); long start = System.currentTimeMillis(); long timeLeft = delay; while (true) { if (notifications > 0) { notifications--; return true; } if (timeLeft <= 0) return false; condition.wait(timeLeft/1000.0f); timeLeft = start + delay - System.currentTimeMillis(); } } } public override int opEquals(Object obj) { return (runnable is (cast(Semaphore) obj).runnable); } public override hash_t toHash() { return runnable is null ? 0 : (cast(Object)runnable).toHash(); } public void release() { synchronized( mutex ){ notifications++; condition.notifyAll(); } } // for debug only public String toString() { return Format("Semaphore({})", cast(Object) runnable ); //$NON-NLS-1$ //$NON-NLS-2$ } }