annotate Implab/Parallels/MTQueue.cs @ 210:5dc21f6a3222 v2

Code review for RunnableComponent Added StaApartment class based on System.Windows.Forms.Application message loop
author cin
date Mon, 20 Mar 2017 17:44:18 +0300
parents 4c945d94b9ab
children
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1 using System.Threading;
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2 using System.Collections.Generic;
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3 using System;
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4 using System.Collections;
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6 namespace Implab.Parallels {
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7 public class MTQueue<T> : IEnumerable<T> {
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8 class Node {
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9 public Node(T value) {
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10 this.value = value;
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11 }
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12 public readonly T value;
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13 public Node next;
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14 }
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15
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16 Node m_first;
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17 Node m_last;
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18
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19 public void Enqueue(T value) {
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20 Thread.MemoryBarrier();
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21
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22 var last = m_last;
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23 var next = new Node(value);
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24
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25 // Interlocaked.CompareExchange implies Thread.MemoryBarrier();
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26 // to ensure that the next node is completely constructed
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27 while (last != Interlocked.CompareExchange(ref m_last, next, last))
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28 last = m_last;
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29
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30 if (last != null)
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31 last.next = next;
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32 else
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33 m_first = next;
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34 }
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35
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36 public bool TryDequeue(out T value) {
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37 Node first;
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38 Node next;
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39 value = default(T);
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40
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41 Thread.MemoryBarrier();
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42 do {
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43 first = m_first;
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44 if (first == null)
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45 return false;
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46 next = first.next;
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47 if (next == null) {
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48 // this is the last element,
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49 // then try to update the tail
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50 if (first != Interlocked.CompareExchange(ref m_last, null, first)) {
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51 // this is the race condition
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52 if (m_last == null)
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53 // the queue is empty
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54 return false;
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55 // tail has been changed, we need to restart
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56 continue;
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57 }
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58
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59 // tail succesfully updated and first.next will never be changed
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60 // other readers will fail due to inconsistency m_last != m_fist && m_first.next == null
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61 // however the parallel writer may update the m_first since the m_last is null
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63 // so we need to fix inconsistency by setting m_first to null or if it has been
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64 // updated by the writer already then we should just to give up
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65 Interlocked.CompareExchange(ref m_first, null, first);
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66 break;
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67
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68 }
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69 if (first == Interlocked.CompareExchange(ref m_first, next, first))
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70 // head succesfully updated
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71 break;
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72 } while (true);
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74 value = first.value;
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75 return true;
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76 }
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77
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78 #region IEnumerable implementation
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79
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80 class Enumerator : IEnumerator<T> {
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81 Node m_current;
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82 Node m_first;
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83
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84 public Enumerator(Node first) {
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85 m_first = first;
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86 }
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87
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88 #region IEnumerator implementation
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89
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90 public bool MoveNext() {
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91 m_current = m_current == null ? m_first : m_current.next;
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92 return m_current != null;
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93 }
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95 public void Reset() {
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96 m_current = null;
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97 }
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98
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99 object IEnumerator.Current {
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100 get {
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101 if (m_current == null)
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102 throw new InvalidOperationException();
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103 return m_current.value;
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104 }
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105 }
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106
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107 #endregion
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108
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109 #region IDisposable implementation
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110
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111 public void Dispose() {
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112 }
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113
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114 #endregion
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115
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116 #region IEnumerator implementation
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117
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118 public T Current {
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119 get {
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120 if (m_current == null)
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121 throw new InvalidOperationException();
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122 return m_current.value;
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123 }
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124 }
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125
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126 #endregion
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127 }
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128
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129 public IEnumerator<T> GetEnumerator() {
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130 return new Enumerator(m_first);
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131 }
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132
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133 #endregion
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134
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135 #region IEnumerable implementation
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136
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137 IEnumerator IEnumerable.GetEnumerator() {
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138 return GetEnumerator();
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139 }
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140
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141 #endregion
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142 }
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143 }