annotate Implab/Parallels/AsyncQueue.cs @ 124:a336cb13c6a9 v2

major update, added Drain mathod to AsyncQueue class
author cin
date Thu, 15 Jan 2015 02:43:14 +0300
parents f4d6ea6969cc
children f803565868a4
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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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5 using System.Diagnostics;
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6
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7 namespace Implab.Parallels {
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8 public class AsyncQueue<T> : IEnumerable<T> {
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9 class Chunk {
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10 public Chunk next;
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11
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12 int m_low;
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13 int m_hi;
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14 int m_alloc;
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15 readonly int m_size;
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16 readonly T[] m_data;
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17
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18 public Chunk(int size) {
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19 m_size = size;
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20 m_data = new T[size];
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21 }
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22
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23 public Chunk(int size, T value) {
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24 m_size = size;
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25 m_hi = 1;
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26 m_alloc = 1;
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27 m_data = new T[size];
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28 m_data[0] = value;
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29 }
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31 public Chunk(int size, T[] data, int offset, int length, int alloc) {
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32 m_size = size;
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33 m_hi = length;
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34 m_alloc = alloc;
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35 m_data = new T[size];
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36 Array.Copy(data, offset, m_data, 0, length);
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37 }
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38
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39 public int Low {
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40 get { return m_low; }
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41 }
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42
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43 public int Hi {
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44 get { return m_hi; }
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45 }
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46
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47 public bool TryEnqueue(T value, out bool extend) {
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48 var alloc = Interlocked.Increment(ref m_alloc) - 1;
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49
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50 if (alloc >= m_size) {
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51 extend = alloc == m_size;
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52 return false;
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53 }
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54
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55 extend = false;
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56 m_data[alloc] = value;
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57
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58 while (alloc != Interlocked.CompareExchange(ref m_hi, alloc + 1, alloc)) {
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59 // spin wait for commit
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60 }
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61 return true;
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62 }
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63
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64 /// <summary>
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65 /// Prevents from allocating new space in the chunk and waits for all write operations to complete
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66 /// </summary>
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67 public void Commit() {
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68 var actual = Math.Min(Interlocked.Exchange(ref m_alloc, m_size + 1), m_size);
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69
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70 while (m_hi != actual)
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71 Thread.MemoryBarrier();
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72 }
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73
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74 public bool TryDequeue(out T value, out bool recycle) {
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75 int low;
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76 do {
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77 low = m_low;
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78 if (low >= m_hi) {
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79 value = default(T);
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80 recycle = (low == m_size);
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81 return false;
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82 }
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83 } while(low != Interlocked.CompareExchange(ref m_low, low + 1, low));
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84
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85 recycle = (low == m_size - 1);
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86 value = m_data[low];
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87
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88 return true;
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89 }
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91 public bool TryEnqueueBatch(T[] batch, int offset, int length, out int enqueued, out bool extend) {
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92 //int alloc;
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93 //int allocSize;
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94
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95 var alloc = Interlocked.Add(ref m_alloc, length) - length;
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96 if (alloc > m_size) {
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97 // the chunk is full and someone already
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98 // creating the new one
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99 enqueued = 0; // nothing was added
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100 extend = false; // the caller shouldn't try to extend the queue
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101 return false; // nothing was added
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102 }
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103
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104 enqueued = Math.Min(m_size - alloc, length);
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105 extend = length > enqueued;
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106
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107 if (enqueued == 0)
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108 return false;
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109
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110
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111 Array.Copy(batch, offset, m_data, alloc, enqueued);
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112
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113 while (alloc != Interlocked.CompareExchange(ref m_hi, alloc + enqueued, alloc)) {
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114 // spin wait for commit
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115 }
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116
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117 return true;
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118 }
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119
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120 public bool TryDequeueBatch(T[] buffer, int offset, int length,out int dequeued, out bool recycle) {
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121 int low, hi, batchSize;
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122
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123 do {
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124 low = m_low;
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125 hi = m_hi;
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126 if (low >= hi) {
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127 dequeued = 0;
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128 recycle = (low == m_size); // recycling could be restarted and we need to signal again
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129 return false;
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130 }
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131 batchSize = Math.Min(hi - low, length);
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132 } while(low != Interlocked.CompareExchange(ref m_low, low + batchSize, low));
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133
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134 recycle = (low == m_size - batchSize);
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135 dequeued = batchSize;
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136
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137 Array.Copy(m_data, low, buffer, offset, batchSize);
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138
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139 return true;
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140 }
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141
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142 public T GetAt(int pos) {
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143 return m_data[pos];
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144 }
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145 }
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146
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147 public const int DEFAULT_CHUNK_SIZE = 32;
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148 public const int MAX_CHUNK_SIZE = 262144;
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149
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150 readonly int m_chunkSize = DEFAULT_CHUNK_SIZE;
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151
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152 Chunk m_first;
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153 Chunk m_last;
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154
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155 public AsyncQueue() {
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156 m_last = m_first = new Chunk(m_chunkSize);
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157 }
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158
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159 /// <summary>
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160 /// Adds the specified value to the queue.
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161 /// </summary>
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162 /// <param name="value">Tha value which will be added to the queue.</param>
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163 public void Enqueue(T value) {
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164 var last = m_last;
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165 // spin wait to the new chunk
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166 bool extend = true;
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167 while (last == null || !last.TryEnqueue(value, out extend)) {
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168 // try to extend queue
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169 if (extend || last == null) {
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170 var chunk = new Chunk(m_chunkSize, value);
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171 if (EnqueueChunk(last, chunk))
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172 break; // success! exit!
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173 last = m_last;
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174 } else {
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175 while (last == m_last) {
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176 Thread.MemoryBarrier();
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177 }
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178 last = m_last;
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179 }
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180 }
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181 }
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182
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183 /// <summary>
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184 /// Adds the specified data to the queue.
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185 /// </summary>
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186 /// <param name="data">The buffer which contains the data to be enqueued.</param>
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187 /// <param name="offset">The offset of the data in the buffer.</param>
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188 /// <param name="length">The size of the data to read from the buffer.</param>
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189 public void EnqueueRange(T[] data, int offset, int length) {
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190 if (data == null)
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191 throw new ArgumentNullException("data");
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192 if (offset < 0)
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193 throw new ArgumentOutOfRangeException("offset");
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194 if (length < 1 || offset + length > data.Length)
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195 throw new ArgumentOutOfRangeException("length");
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
196
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
197 var last = m_last;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
198
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
199 bool extend;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
200 int enqueued;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
201
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
202 while (length > 0) {
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
203 extend = true;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
204 if (last != null && last.TryEnqueueBatch(data, offset, length, out enqueued, out extend)) {
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
205 length -= enqueued;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
206 offset += enqueued;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
207 }
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
208
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
209 if (extend) {
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
210 // there was no enough space in the chunk
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
211 // or there was no chunks in the queue
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
212
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
213 while (length > 0) {
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
214
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
215 var size = Math.Min(length, MAX_CHUNK_SIZE);
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
216
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
217 var chunk = new Chunk(
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
218 Math.Max(size, m_chunkSize),
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
219 data,
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
220 offset,
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
221 size,
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
222 length // length >= size
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
223 );
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
224
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
225 if (!EnqueueChunk(last, chunk)) {
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
226 // looks like the queue has been updated then proceed from the beginning
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
227 last = m_last;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
228 break;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
229 }
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
230
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
231 // we have successfully added the new chunk
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
232 last = chunk;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
233 length -= size;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
234 offset += size;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
235 }
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
236 } else {
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
237 // we don't need to extend the queue, if we successfully enqueued data
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
238 if (length == 0)
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
239 break;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
240
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
241 // if we need to wait while someone is extending the queue
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
242 // spinwait
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
243 while (last == m_last) {
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
244 Thread.MemoryBarrier();
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
245 }
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
246
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
247 last = m_last;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
248 }
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
249 }
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
250 }
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
251
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
252 /// <summary>
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
253 /// Tries to retrieve the first element from the queue.
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
254 /// </summary>
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
255 /// <returns><c>true</c>, if element is dequeued, <c>false</c> otherwise.</returns>
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
256 /// <param name="value">The value of the dequeued element.</param>
119
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
257 public bool TryDequeue(out T value) {
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
258 var chunk = m_first;
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
259 bool recycle;
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
260 while (chunk != null) {
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
261
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
262 var result = chunk.TryDequeue(out value, out recycle);
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
263
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
264 if (recycle) // this chunk is waste
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
265 RecycleFirstChunk(chunk);
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
266 else
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
267 return result; // this chunk is usable and returned actual result
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
268
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
269 if (result) // this chunk is waste but the true result is always actual
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
270 return true;
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
271
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
272 // try again
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
273 chunk = m_first;
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
274 }
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
275
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
276 // the queue is empty
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
277 value = default(T);
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
278 return false;
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
279 }
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
280
121
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
281 /// <summary>
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
282 /// Tries to dequeue the specified amount of data from the queue.
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
283 /// </summary>
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
284 /// <returns><c>true</c>, if data was deuqueued, <c>false</c> otherwise.</returns>
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
285 /// <param name="buffer">The buffer to which the data will be written.</param>
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
286 /// <param name="offset">The offset in the buffer at which the data will be written.</param>
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
287 /// <param name="length">The maximum amount of data to be retrieved.</param>
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
288 /// <param name="dequeued">The actual amout of the retrieved data.</param>
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
289 public bool TryDequeueRange(T[] buffer, int offset, int length, out int dequeued) {
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
290 if (buffer == null)
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
291 throw new ArgumentNullException("buffer");
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
292 if (offset < 0)
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
293 throw new ArgumentOutOfRangeException("offset");
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
294 if (length < 1 || offset + length > buffer.Length)
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
295 throw new ArgumentOutOfRangeException("length");
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
296
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
297 var chunk = m_first;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
298 bool recycle;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
299 dequeued = 0;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
300 while (chunk != null) {
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
301
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
302 int actual;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
303 if (chunk.TryDequeueBatch(buffer, offset, length, out actual, out recycle)) {
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
304 offset += actual;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
305 length -= actual;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
306 dequeued += actual;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
307 }
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
308
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
309 if (recycle) // this chunk is waste
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
310 RecycleFirstChunk(chunk);
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
311 else if (actual == 0)
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
312 break; // the chunk is usable, but doesn't contain any data (it's the last chunk in the queue)
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
313
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
314 if (length == 0)
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
315 return true;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
316
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
317 // we still may dequeue something
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
318 // try again
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
319 chunk = m_first;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
320 }
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
321
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
322 return dequeued != 0;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
323 }
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
324
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
325 /// <summary>
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
326 /// Tries to dequeue all remaining data in the first chunk.
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
327 /// </summary>
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
328 /// <returns><c>true</c>, if data was dequeued, <c>false</c> otherwise.</returns>
122
0c8685c8b56b minor fixes and improvements of AsyncQueue, additional tests
cin
parents: 121
diff changeset
329 /// <param name="buffer">The buffer to which the data will be written.</param>
121
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
330 /// <param name="offset">The offset in the buffer at which the data will be written.</param>
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
331 /// <param name="length">Tha maximum amount of the data to be dequeued.</param>
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
332 /// <param name="dequeued">The actual amount of the dequeued data.</param>
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
333 public bool TryDequeueChunk(T[] buffer, int offset, int length, out int dequeued) {
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
334 if (buffer == null)
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
335 throw new ArgumentNullException("buffer");
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
336 if (offset < 0)
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
337 throw new ArgumentOutOfRangeException("offset");
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
338 if (length < 1 || offset + length > buffer.Length)
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
339 throw new ArgumentOutOfRangeException("length");
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
340
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
341 var chunk = m_first;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
342 bool recycle;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
343 dequeued = 0;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
344
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
345 while (chunk != null) {
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
346
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
347 int actual;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
348 if (chunk.TryDequeueBatch(buffer, offset, length, out actual, out recycle)) {
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
349 dequeued = actual;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
350 }
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
351
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
352 if (recycle) // this chunk is waste
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
353 RecycleFirstChunk(chunk);
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
354
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
355 // if we have dequeued any data, then return
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
356 if (dequeued != 0)
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
357 return true;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
358
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
359 // we still may dequeue something
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
360 // try again
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
361 chunk = m_first;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
362 }
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
363
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
364 return false;
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
365 }
62d2f1e98c4e working version of AsyncQueue and batch operations
cin
parents: 120
diff changeset
366
119
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
367 bool EnqueueChunk(Chunk last, Chunk chunk) {
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
368 if (Interlocked.CompareExchange(ref m_last, chunk, last) != last)
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
369 return false;
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
370
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
371 if (last != null)
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
372 last.next = chunk;
124
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
373 else {
119
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
374 m_first = chunk;
124
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
375 }
119
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
376 return true;
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
377 }
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
378
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
379 void RecycleFirstChunk(Chunk first) {
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
380 var next = first.next;
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
381
124
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
382 if (first != Interlocked.CompareExchange(ref m_first, next, first))
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
383 return;
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
384
119
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
385 if (next == null) {
124
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
386
119
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
387 if (first != Interlocked.CompareExchange(ref m_last, null, first)) {
124
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
388 /*while (first.next == null)
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
389 Thread.MemoryBarrier();*/
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
390
119
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
391 // race
124
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
392 // someone already updated the tail, restore the pointer to the queue head
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
393 m_first = first;
119
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
394 }
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
395 // the tail is updated
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
396 }
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
397
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
398 // we need to update the head
124
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
399 //Interlocked.CompareExchange(ref m_first, next, first);
119
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
400 // if the head is already updated then give up
124
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
401 //return;
119
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
402
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
403 }
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
404
123
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
405 public void Clear() {
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
406 // start the new queue
124
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
407 var chunk = new Chunk(m_chunkSize);
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
408
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
409 do {
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
410 Thread.MemoryBarrier();
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
411 var first = m_first;
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
412 var last = m_last;
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
413
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
414 if (last == null) // nothing to clear
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
415 return;
123
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
416
124
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
417 if (first == null || (first.next == null && first != last)) // inconcistency
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
418 continue;
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
419
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
420 // here we will create inconsistency which will force others to spin
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
421 // and prevent from fetching. chunk.next = null
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
422 if (first != Interlocked.CompareExchange(ref m_first, chunk, first))
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
423 continue;// inconsistent
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
424
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
425 m_last = chunk;
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
426
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
427 return;
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
428
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
429 } while(true);
123
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
430 }
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
431
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
432 public T[] Drain() {
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
433 // start the new queue
124
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
434 var chunk = new Chunk(m_chunkSize);
123
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
435
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
436 do {
124
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
437 Thread.MemoryBarrier();
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
438 var first = m_first;
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
439 var last = m_last;
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
440
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
441 if (last == null)
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
442 return new T[0];
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
443
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
444 if (first == null || (first.next == null && first != last))
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
445 continue;
123
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
446
124
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
447 // here we will create inconsistency which will force others to spin
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
448 // and prevent from fetching. chunk.next = null
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
449 if (first != Interlocked.CompareExchange(ref m_first, chunk, first))
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
450 continue;// inconsistent
123
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
451
124
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
452 last = Interlocked.Exchange(ref m_last, chunk);
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
453
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
454 return ReadChunks(first, last);
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
455
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
456 } while(true);
123
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
457 }
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
458
124
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
459 T[] ReadChunks(Chunk chunk, object last) {
123
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
460 var result = new List<T>();
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
461 var buffer = new T[m_chunkSize];
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
462 int actual;
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
463 bool recycle;
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
464 while (chunk != null) {
124
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
465 // ensure all write operations on the chunk are complete
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
466 chunk.Commit();
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
467
123
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
468 // we need to read the chunk using this way
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
469 // since some client still may completing the dequeue
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
470 // operation, such clients most likely won't get results
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
471 while (chunk.TryDequeueBatch(buffer, 0, buffer.Length, out actual, out recycle))
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
472 result.AddRange(new ArraySegmentCollection(buffer, 0, actual));
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
473
124
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
474 if (chunk == last) {
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
475 chunk = null;
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
476 } else {
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
477 while (chunk.next == null)
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
478 Thread.MemoryBarrier();
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
479 chunk = chunk.next;
a336cb13c6a9 major update, added Drain mathod to AsyncQueue class
cin
parents: 123
diff changeset
480 }
123
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
481 }
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
482
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
483 return result.ToArray();
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
484 }
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
485
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
486 struct ArraySegmentCollection : ICollection<T> {
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
487 readonly T[] m_data;
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
488 readonly int m_offset;
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
489 readonly int m_length;
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
490
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
491 public ArraySegmentCollection(T[] data, int offset, int length) {
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
492 m_data = data;
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
493 m_offset = offset;
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
494 m_length = length;
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
495 }
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
496
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
497 #region ICollection implementation
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
498
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
499 public void Add(T item) {
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
500 throw new InvalidOperationException();
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
501 }
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
502
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
503 public void Clear() {
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
504 throw new InvalidOperationException();
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
505 }
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
506
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
507 public bool Contains(T item) {
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
508 return false;
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
509 }
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
510
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
511 public void CopyTo(T[] array, int arrayIndex) {
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
512 Array.Copy(m_data,m_offset,array,arrayIndex, m_length);
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
513 }
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
514
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
515 public bool Remove(T item) {
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
516 throw new NotImplementedException();
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
517 }
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
518
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
519 public int Count {
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
520 get {
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
521 return m_length;
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
522 }
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
523 }
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
524
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
525 public bool IsReadOnly {
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
526 get {
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
527 return true;
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
528 }
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
529 }
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
530
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
531 #endregion
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
532
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
533 #region IEnumerable implementation
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
534
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
535 public IEnumerator<T> GetEnumerator() {
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
536 for (int i = m_offset; i < m_length + m_offset; i++)
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
537 yield return m_data[i];
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
538 }
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
539
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
540 #endregion
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
541
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
542 #region IEnumerable implementation
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
543
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
544 IEnumerator IEnumerable.GetEnumerator() {
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
545 return GetEnumerator();
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
546 }
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
547
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
548 #endregion
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
549 }
f4d6ea6969cc async queue improvements
cin
parents: 122
diff changeset
550
119
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
551 #region IEnumerable implementation
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
552
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
553 class Enumerator : IEnumerator<T> {
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
554 Chunk m_current;
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
555 int m_pos = -1;
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
556
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
557 public Enumerator(Chunk fisrt) {
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
558 m_current = fisrt;
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
559 }
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
560
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
561 #region IEnumerator implementation
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
562
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
563 public bool MoveNext() {
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
564 if (m_current == null)
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
565 return false;
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
566
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
567 if (m_pos == -1)
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
568 m_pos = m_current.Low;
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
569 else
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
570 m_pos++;
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
571 if (m_pos == m_current.Hi) {
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
572 m_pos = 0;
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
573 m_current = m_current.next;
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
574 }
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
575
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
576 return true;
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
577 }
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
578
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
579 public void Reset() {
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
580 throw new NotSupportedException();
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
581 }
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
582
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
583 object IEnumerator.Current {
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
584 get {
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
585 return Current;
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
586 }
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
587 }
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
588
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
589 #endregion
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
590
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
591 #region IDisposable implementation
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
592
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
593 public void Dispose() {
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
594 }
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
595
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
596 #endregion
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
597
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
598 #region IEnumerator implementation
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
599
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
600 public T Current {
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
601 get {
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
602 if (m_pos == -1 || m_current == null)
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
603 throw new InvalidOperationException();
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
604 return m_current.GetAt(m_pos);
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
605 }
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
606 }
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
607
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
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608 #endregion
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
609 }
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
610
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
611 public IEnumerator<T> GetEnumerator() {
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
612 return new Enumerator(m_first);
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
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613 }
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
614
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
615 #endregion
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
616
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
617 #region IEnumerable implementation
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
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618
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
619 IEnumerator IEnumerable.GetEnumerator() {
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
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620 return GetEnumerator();
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
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621 }
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
622
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
diff changeset
623 #endregion
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
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624 }
2573b562e328 Promises rewritten, added improved version of AsyncQueue
cin
parents:
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625 }