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Upload of whole dwt tree
author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Sat, 09 Aug 2008 17:00:02 +0200
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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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 *
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11 * Port to the D programming language:
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12 * Frank Benoit <benoit@tionex.de>
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13 *******************************************************************************/
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14 module dwt.internal.Lock;
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15
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16 import tango.core.Thread;
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17 import tango.core.sync.Mutex;
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18 import tango.core.sync.Condition;
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19 import tango.core.Exception;
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20
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21 import dwt.dwthelper.utils;
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22
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23 /**
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24 * Instance of this represent a recursive monitor.
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25 */
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26 public class Lock
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27 {
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28 int count, waitCount;
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29 Thread owner;
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30 Mutex mutex;
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31 Condition cond;
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32
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33 public this ()
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34 {
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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 /**
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40 * Locks the monitor and returns the lock count. If
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41 * the lock is owned by another thread, wait until
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42 * the lock is released.
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43 *
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44 * @return the lock count
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45 */
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46 public int lock ()
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47 {
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48 synchronized (mutex)
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49 {
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50 Thread current = Thread.getThis();
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51 if (owner !is current)
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52 {
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53 waitCount++;
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54 while (count > 0)
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55 {
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56 try
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57 {
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58 cond.wait();
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59 }
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60 catch (SyncException e)
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61 {
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62 /* Wait forever, just like synchronized blocks */
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63 }
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64 }
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65 --waitCount;
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66 owner = current;
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67 }
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68 return ++count;
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69 }
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70 }
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71
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72 /**
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73 * Unlocks the monitor. If the current thread is not
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74 * the monitor owner, do nothing.
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75 */
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76 public void unlock ()
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77 {
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78 synchronized (mutex)
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79 {
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80 Thread current = Thread.getThis();
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81 if (owner is current)
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82 {
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83 if (--count is 0)
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84 {
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85 owner = null;
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86 if (waitCount > 0)
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87 cond.notifyAll();
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88 }
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89 }
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90 }
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91 }
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92 }