annotate Core/MultiThreading/RunnableWorkersPool.cpp @ 2547:8b6b0b6ece6b

MinGW, ORTHANC_FRAMEWORK_URL
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 18 Apr 2018 10:23:40 +0200
parents 878b59270859
children 4e43e67f8ecf
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
1900
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2018 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU General Public License as
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9 * published by the Free Software Foundation, either version 3 of the
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10 * License, or (at your option) any later version.
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11 *
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12 * In addition, as a special exception, the copyright holders of this
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13 * program give permission to link the code of its release with the
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14 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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15 * that use the same license as the "OpenSSL" library), and distribute
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16 * the linked executables. You must obey the GNU General Public License
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17 * in all respects for all of the code used other than "OpenSSL". If you
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18 * modify file(s) with this exception, you may extend this exception to
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19 * your version of the file(s), but you are not obligated to do so. If
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20 * you do not wish to do so, delete this exception statement from your
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21 * version. If you delete this exception statement from all source files
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22 * in the program, then also delete it here.
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23 *
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24 * This program is distributed in the hope that it will be useful, but
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25 * WITHOUT ANY WARRANTY; without even the implied warranty of
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26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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27 * General Public License for more details.
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28 *
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29 * You should have received a copy of the GNU General Public License
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30 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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31 **/
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32
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33
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34 #include "../PrecompiledHeaders.h"
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35 #include "RunnableWorkersPool.h"
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36
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37 #include "SharedMessageQueue.h"
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38 #include "../OrthancException.h"
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39 #include "../Logging.h"
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40
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41 namespace Orthanc
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42 {
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43 struct RunnableWorkersPool::PImpl
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44 {
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45 class Worker
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46 {
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47 private:
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48 const bool& continue_;
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49 SharedMessageQueue& queue_;
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50 boost::thread thread_;
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51
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52 static void WorkerThread(Worker* that)
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53 {
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54 while (that->continue_)
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55 {
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56 try
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57 {
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58 std::auto_ptr<IDynamicObject> obj(that->queue_.Dequeue(100));
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59 if (obj.get() != NULL)
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60 {
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61 IRunnableBySteps& runnable = *dynamic_cast<IRunnableBySteps*>(obj.get());
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62
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63 bool wishToContinue = runnable.Step();
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64
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65 if (wishToContinue)
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66 {
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67 // The runnable wishes to continue, reinsert it at the beginning of the queue
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68 that->queue_.Enqueue(obj.release());
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69 }
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70 }
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71 }
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72 catch (OrthancException& e)
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73 {
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74 LOG(ERROR) << "Exception while handling some runnable object: " << e.What();
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75 }
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76 catch (std::bad_alloc&)
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77 {
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78 LOG(ERROR) << "Not enough memory to handle some runnable object";
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79 }
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80 catch (std::exception& e)
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81 {
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82 LOG(ERROR) << "std::exception while handling some runnable object: " << e.what();
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83 }
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84 catch (...)
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85 {
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86 LOG(ERROR) << "Native exception while handling some runnable object";
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87 }
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88 }
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89 }
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90
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91 public:
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92 Worker(const bool& globalContinue,
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93 SharedMessageQueue& queue) :
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94 continue_(globalContinue),
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95 queue_(queue)
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96 {
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97 thread_ = boost::thread(WorkerThread, this);
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98 }
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99
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100 void Join()
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101 {
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102 if (thread_.joinable())
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103 {
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104 thread_.join();
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105 }
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106 }
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107 };
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108
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109
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110 bool continue_;
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111 std::vector<Worker*> workers_;
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112 SharedMessageQueue queue_;
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113 };
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114
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115
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116
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117 RunnableWorkersPool::RunnableWorkersPool(size_t countWorkers) : pimpl_(new PImpl)
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118 {
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119 pimpl_->continue_ = true;
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120
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121 if (countWorkers == 0)
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122 {
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123 throw OrthancException(ErrorCode_ParameterOutOfRange);
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124 }
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125
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126 pimpl_->workers_.resize(countWorkers);
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127
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128 for (size_t i = 0; i < countWorkers; i++)
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129 {
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130 pimpl_->workers_[i] = new PImpl::Worker(pimpl_->continue_, pimpl_->queue_);
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131 }
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132 }
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133
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134
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135 void RunnableWorkersPool::Stop()
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136 {
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137 if (pimpl_->continue_)
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138 {
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139 pimpl_->continue_ = false;
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140
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141 for (size_t i = 0; i < pimpl_->workers_.size(); i++)
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142 {
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143 PImpl::Worker* worker = pimpl_->workers_[i];
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144
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145 if (worker != NULL)
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146 {
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147 worker->Join();
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148 delete worker;
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149 }
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150 }
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151 }
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152 }
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153
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154
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155 RunnableWorkersPool::~RunnableWorkersPool()
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156 {
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157 Stop();
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158 }
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159
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160
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161 void RunnableWorkersPool::Add(IRunnableBySteps* runnable)
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162 {
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163 if (!pimpl_->continue_)
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164 {
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165 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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166 }
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167
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168 pimpl_->queue_.Enqueue(runnable);
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169 }
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170 }