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annotate org.eclipse.swt.win32.win32.x86/src/org/eclipse/swt/internal/Lock.d @ 113:fb3aa8075988

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D2 support for the linux port.
author Jacob Carlborg <doob@me.com>
date Wed, 06 Apr 2011 21:57:23 +0200
parents 0ecb2b338560
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2005 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module org.eclipse.swt.internal.Lock;
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14
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15 import java.lang.all;
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16 import java.lang.Thread;
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17 version(Tango){
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18 import tango.core.sync.Mutex;
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19 import tango.core.sync.Condition;
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20 } else {
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21 import core.sync.mutex;
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22 import core.sync.condition;
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23 }
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24
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25 /**
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26 * Instance of this represent a recursive monitor.
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27 */
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28 public class Lock {
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29 int count, waitCount;
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30 Thread owner;
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31 Mutex mutex;
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32 Condition cond;
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33
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34 public this() {
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35 mutex = new Mutex;
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36 cond = new Condition(mutex);
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37 }
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38 /**
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39 * Locks the monitor and returns the lock count. If
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40 * the lock is owned by another thread, wait until
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41 * the lock is released.
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42 *
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43 * @return the lock count
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44 */
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45 public int lock() {
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46 synchronized (mutex) {
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47 Thread current = Thread.currentThread();
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48 if (owner !is current) {
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49 waitCount++;
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50 while (count > 0) {
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51 try {
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52 cond.wait();
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53 } catch (SyncException e) {
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54 /* Wait forever, just like synchronized blocks */
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55 }
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56 }
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57 --waitCount;
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58 owner = current;
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59 }
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60 return ++count;
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61 }
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62 }
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63
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64 /**
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65 * Unlocks the monitor. If the current thread is not
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66 * the monitor owner, do nothing.
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67 */
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68 public void unlock() {
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69 synchronized (mutex) {
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70 Thread current = Thread.currentThread();
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71 if (owner is current) {
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72 if (--count is 0) {
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73 owner = null;
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74 if (waitCount > 0) cond.notifyAll();
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75 }
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76 }
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79 }