Mercurial > projects > dwt-addons
view dwtx/core/runtime/jobs/LockListener.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) 2004, 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 - Initial API and implementation * Port to the D programming language: * Frank Benoit <benoit@tionex.de> *******************************************************************************/ module dwtx.core.runtime.jobs.LockListener; import tango.core.Thread; import dwt.dwthelper.utils; import dwtx.core.internal.jobs.JobManager; import dwtx.core.internal.jobs.LockManager; import dwtx.core.runtime.jobs.Job; /** * A lock listener is notified whenever a thread is about to wait * on a lock, and when a thread is about to release a lock. * <p> * This class is for internal use by the platform-related plug-ins. * Clients outside of the base platform should not reference or subclass this class. * </p> * * @see IJobManager#setLockListener(LockListener) * @since 3.0 */ public class LockListener { private const LockManager manager; public this(){ manager = (cast(JobManager)Job.getJobManager()).getLockManager(); } /** * Notification that a thread is about to block on an attempt to acquire a lock. * Returns whether the thread should be granted immediate access to the lock. * <p> * This default implementation always returns <code>false</code>. * Subclasses may override. * * @param lockOwner the thread that currently owns the lock this thread is * waiting for, or <code>null</code> if unknown. * @return <code>true</code> if the thread should be granted immediate access, * and <code>false</code> if it should wait for the lock to be available */ public bool aboutToWait(Thread lockOwner) { return false; } /** * Notification that a thread is about to release a lock. * <p> * This default implementation does nothing. Subclasses may override. */ public void aboutToRelease() { //do nothing } /** * Returns whether this thread currently owns any locks * @return <code>true</code> if this thread owns any locks, and * <code>false</code> otherwise. */ protected final bool isLockOwnerThread() { return manager.isLockOwner(); } }