annotate Implab/Parallels/ArrayTraits.cs @ 94:a43745f81f10 v2

minor fixes
author cin
date Thu, 23 Oct 2014 17:50:09 +0400
parents 4c0e5ef99986
children 279e226dffdd
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1 using Implab.Diagnostics;
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2 using System;
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3 using System.Collections.Generic;
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4 using System.Diagnostics;
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5 using System.Linq;
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6 using System.Text;
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7 using System.Threading;
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8
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9 namespace Implab.Parallels {
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10 public static class ArrayTraits {
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11 class ArrayIterator<TSrc> : DispatchPool<int> {
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12 readonly Action<TSrc> m_action;
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13 readonly TSrc[] m_source;
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14 readonly Promise<int> m_promise = new Promise<int>();
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15 readonly LogicalOperation m_logicalOperation;
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17 int m_pending;
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18 int m_next;
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20 public ArrayIterator(TSrc[] source, Action<TSrc> action, int threads)
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21 : base(threads) {
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22
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23 Debug.Assert(source != null);
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24 Debug.Assert(action != null);
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25
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26 m_logicalOperation = TraceContext.Instance.CurrentOperation;
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27 m_next = 0;
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28 m_source = source;
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29 m_pending = source.Length;
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30 m_action = action;
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31
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32 m_promise.Anyway(Dispose);
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33
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34 InitPool();
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35 }
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36
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37 public Promise<int> Promise {
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38 get {
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39 return m_promise;
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40 }
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41 }
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42
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43 protected override void Worker() {
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44 TraceContext.Instance.EnterLogicalOperation(m_logicalOperation, false);
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45 try {
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46 base.Worker();
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47 } finally {
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48 TraceContext.Instance.Leave();
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49 }
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50 }
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51
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52 protected override bool TryDequeue(out int unit) {
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53 unit = Interlocked.Increment(ref m_next) - 1;
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54 return unit < m_source.Length;
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55 }
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56
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57 protected override void InvokeUnit(int unit) {
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58 try {
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59 m_action(m_source[unit]);
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60 var pending = Interlocked.Decrement(ref m_pending);
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61 if (pending == 0)
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62 m_promise.Resolve(m_source.Length);
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63 } catch (Exception e) {
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64 m_promise.Reject(e);
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65 }
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66 }
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67 }
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69 class ArrayMapper<TSrc, TDst>: DispatchPool<int> {
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70 readonly Func<TSrc, TDst> m_transform;
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71 readonly TSrc[] m_source;
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72 readonly TDst[] m_dest;
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73 readonly Promise<TDst[]> m_promise = new Promise<TDst[]>();
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74 readonly LogicalOperation m_logicalOperation;
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76 int m_pending;
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77 int m_next;
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79 public ArrayMapper(TSrc[] source, Func<TSrc, TDst> transform, int threads)
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80 : base(threads) {
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81
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82 Debug.Assert (source != null);
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83 Debug.Assert( transform != null);
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84
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85 m_next = 0;
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86 m_source = source;
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87 m_dest = new TDst[source.Length];
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88 m_pending = source.Length;
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89 m_transform = transform;
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90 m_logicalOperation = TraceContext.Instance.CurrentOperation;
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91
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92 m_promise.Anyway(Dispose);
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93
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94 InitPool();
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95 }
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96
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97 public Promise<TDst[]> Promise {
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98 get {
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99 return m_promise;
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100 }
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101 }
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102
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103 protected override void Worker() {
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104 TraceContext.Instance.EnterLogicalOperation(m_logicalOperation,false);
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105 try {
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106 base.Worker();
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107 } finally {
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108 TraceContext.Instance.Leave();
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109 }
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110 }
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111
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112 protected override bool TryDequeue(out int unit) {
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113 unit = Interlocked.Increment(ref m_next) - 1;
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114 return unit < m_source.Length;
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115 }
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116
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117 protected override void InvokeUnit(int unit) {
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118 try {
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119 m_dest[unit] = m_transform(m_source[unit]);
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120 var pending = Interlocked.Decrement(ref m_pending);
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121 if (pending == 0)
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122 m_promise.Resolve(m_dest);
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123 } catch (Exception e) {
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124 m_promise.Reject(e);
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125 }
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126 }
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127 }
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128
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129 public static IPromise<TDst[]> ParallelMap<TSrc, TDst> (this TSrc[] source, Func<TSrc,TDst> transform, int threads) {
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130 if (source == null)
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131 throw new ArgumentNullException("source");
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132 if (transform == null)
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133 throw new ArgumentNullException("transform");
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134
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135 var mapper = new ArrayMapper<TSrc, TDst>(source, transform, threads);
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136 return mapper.Promise;
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137 }
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138
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139 public static IPromise<int> ParallelForEach<TSrc>(this TSrc[] source, Action<TSrc> action, int threads) {
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140 if (source == null)
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141 throw new ArgumentNullException("source");
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142 if (action == null)
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143 throw new ArgumentNullException("action");
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144
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145 var iter = new ArrayIterator<TSrc>(source, action, threads);
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146 return iter.Promise;
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147 }
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148
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149 public static IPromise<TDst[]> ChainedMap<TSrc, TDst>(this TSrc[] source, ResultMapper<TSrc, IPromise<TDst>> transform, int threads) {
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150 if (source == null)
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151 throw new ArgumentNullException("source");
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152 if (transform == null)
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153 throw new ArgumentNullException("transform");
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154 if (threads <= 0)
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155 throw new ArgumentOutOfRangeException("Threads number must be greater then zero");
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156
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157 if (source.Length == 0)
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158 return Promise<TDst[]>.ResultToPromise(new TDst[0]);
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159
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160 var promise = new Promise<TDst[]>();
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161 var res = new TDst[source.Length];
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162 var pending = source.Length;
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163
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164 object locker = new object();
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165 int slots = threads;
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166
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167 // Analysis disable AccessToDisposedClosure
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168 AsyncPool.InvokeNewThread(() => {
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169 for (int i = 0; i < source.Length; i++) {
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170 if(promise.IsResolved)
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171 break; // stop processing in case of error or cancellation
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172 var idx = i;
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173
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174 if (Interlocked.Decrement(ref slots) < 0) {
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175 lock(locker) {
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176 while(slots < 0)
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177 Monitor.Wait(locker);
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178 }
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179 }
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180
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181 try {
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182 transform(source[i])
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183 .Anyway(() => {
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184 Interlocked.Increment(ref slots);
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185 lock (locker) {
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186 Monitor.Pulse(locker);
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187 }
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188 })
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189 .Last(
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190 x => {
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191 res[idx] = x;
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192 var left = Interlocked.Decrement(ref pending);
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193 if (left == 0)
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194 promise.Resolve(res);
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195 },
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196 promise.Reject
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197 );
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198
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199 } catch (Exception e) {
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200 promise.Reject(e);
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201 }
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202 }
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203 return 0;
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204 });
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205
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206 return promise;
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207 }
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208
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209 }
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210 }