Mercurial > projects > dwt-mac
annotate dwt/internal/Lock.d @ 45:d8635bb48c7c
Merge with SWT 3.5
author | Jacob Carlborg <doob@me.com> |
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date | Mon, 01 Dec 2008 17:07:00 +0100 |
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rev | line source |
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45 | 1 /******************************************************************************* |
2 * Copyright (c) 2000, 2008 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 /** |
45 | 24 * Instances of this represent a recursive monitor. Note that this |
25 * is an empty implementation which does not actually perform locking. | |
0
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26 */ |
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27 public class Lock |
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28 { |
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29 Mutex mutex; |
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30 Condition cond; |
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31 |
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32 public this () |
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33 { |
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34 mutex = new Mutex; |
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35 cond = new Condition(mutex); |
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36 } |
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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 { |
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47 synchronized (mutex) |
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48 { |
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49 Thread current = Thread.getThis(); |
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50 if (owner !is current) |
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51 { |
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52 waitCount++; |
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53 while (count > 0) |
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54 { |
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55 try |
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56 { |
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57 cond.wait(); |
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58 } |
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59 catch (SyncException e) |
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60 { |
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61 } |
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62 } |
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63 --waitCount; |
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64 owner = current; |
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65 } |
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66 return ++count; |
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67 } |
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68 } |
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69 |
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70 /** |
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71 * Unlocks the monitor. If the current thread is not |
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72 * the monitor owner, do nothing. |
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73 */ |
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74 public void unlock () |
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75 { |
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76 synchronized (mutex) |
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77 { |
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78 Thread current = Thread.getThis(); |
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79 if (owner is current) |
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80 { |
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81 if (--count is 0) |
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82 { |
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83 owner = null; |
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84 if (waitCount > 0) |
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85 cond.notifyAll(); |
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86 } |
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87 } |
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88 } |
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89 } |
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90 } |