| /******************************************************************************* |
| * Copyright (c) 2000, 2009 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jdt.core.tests.model; |
| |
| /** |
| * A semaphore implementation with timeout. |
| */ |
| public class Semaphore { |
| |
| private String name = null; |
| private int permissions = 0; |
| |
| public static class TimeOutException extends Exception { |
| private static final long serialVersionUID = 1L; |
| } |
| public Semaphore() { |
| this(null, 0); |
| } |
| public Semaphore(int initialPermisions) { |
| this(null, initialPermisions); |
| } |
| public Semaphore(String name, int initialPermissions) { |
| this.name = name; |
| this.permissions = initialPermissions; |
| } |
| public void acquire() { |
| try { |
| acquire(Long.MAX_VALUE); |
| } catch (TimeOutException e) { |
| e.printStackTrace(); |
| } |
| } |
| public synchronized void acquire(long timeout) throws TimeOutException { |
| long start = System.currentTimeMillis(); |
| while (this.permissions <= 0 && timeout > 0) { |
| try { |
| if (this.name != null) System.out.println(Thread.currentThread() + " - waiting to acquire: " + this.name); //$NON-NLS-1$ |
| if (timeout == Long.MAX_VALUE) { |
| wait(); |
| } else { |
| wait(timeout); |
| } |
| } catch(InterruptedException e){ |
| } |
| timeout -= System.currentTimeMillis() - start; |
| } |
| if (timeout <= 0) { |
| throw new TimeOutException(); |
| } |
| this.permissions--; |
| if (this.name != null) System.out.println(Thread.currentThread() + " - acquired: " + this.name); //$NON-NLS-1$ |
| } |
| public int getCurrentPemissions() { |
| return this.permissions; |
| } |
| public synchronized void release() { |
| if (this.name != null) System.out.println(Thread.currentThread() + " - releasing: " + this.name); //$NON-NLS-1$ |
| if (++this.permissions > 0) notifyAll(); |
| } |
| } |