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1 /**
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2 * Palanthir - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012 Medical Physics Department, CHU of Liege,
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4 * Belgium
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5 *
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6 * This program is free software: you can redistribute it and/or
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7 * modify it under the terms of the GNU General Public License as
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8 * published by the Free Software Foundation, either version 3 of the
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9 * License, or (at your option) any later version.
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10 *
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11 * This program is distributed in the hope that it will be useful, but
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12 * WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 * General Public License for more details.
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15 *
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16 * You should have received a copy of the GNU General Public License
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17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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18 **/
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19
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20
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21 #include "BagOfRunnablesBySteps.h"
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22
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23 #include <stack>
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24 #include <boost/thread.hpp>
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25
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26 namespace Palanthir
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27 {
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28 struct BagOfRunnablesBySteps::PImpl
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29 {
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30 bool continue_;
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31 bool stopFinishListener_;
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32
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33 boost::mutex mutex_;
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34 boost::condition_variable oneThreadIsStopped_;
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35 boost::condition_variable oneThreadIsJoined_;
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36
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37 // The list of threads that are waiting to be joined.
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38 typedef std::stack<IRunnableBySteps*> StoppedThreads;
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39 StoppedThreads stoppedThreads_;
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40
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41 // The set of active runnables, i.e. the runnables that have not
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42 // finished their job yet, plus the runnables that have not been
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43 // joined yet.
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44 typedef std::map<IRunnableBySteps*, boost::thread*> ActiveThreads;
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45 ActiveThreads activeThreads_;
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46
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47 // The thread that joins the runnables after they stop
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48 std::auto_ptr<boost::thread> finishListener_;
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49 };
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50
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51
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52
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53 void BagOfRunnablesBySteps::RunnableThread(BagOfRunnablesBySteps* bag,
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54 IRunnableBySteps* runnable)
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55 {
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56 while (bag->pimpl_->continue_)
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57 {
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58 if (!runnable->Step())
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59 {
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60 break;
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61 }
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62 }
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63
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64 {
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65 // Register this runnable as having stopped
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66 boost::mutex::scoped_lock lock(bag->pimpl_->mutex_);
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67 bag->pimpl_->stoppedThreads_.push(runnable);
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68 bag->pimpl_->oneThreadIsStopped_.notify_one();
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69 }
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70 }
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71
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72
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73 void BagOfRunnablesBySteps::FinishListener(BagOfRunnablesBySteps* bag)
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74 {
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75 boost::mutex::scoped_lock lock(bag->pimpl_->mutex_);
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76
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77 while (!bag->pimpl_->stopFinishListener_)
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78 {
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79 while (!bag->pimpl_->stoppedThreads_.empty())
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80 {
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81 std::auto_ptr<IRunnableBySteps> r(bag->pimpl_->stoppedThreads_.top());
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82 bag->pimpl_->stoppedThreads_.pop();
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83
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84 assert(r.get() != NULL);
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85 assert(bag->pimpl_->activeThreads_.find(r.get()) != bag->pimpl_->activeThreads_.end());
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86
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87 std::auto_ptr<boost::thread> t(bag->pimpl_->activeThreads_[r.get()]);
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88 bag->pimpl_->activeThreads_.erase(r.get());
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89
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90 assert(t.get() != NULL);
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91 assert(bag->pimpl_->activeThreads_.find(r.get()) == bag->pimpl_->activeThreads_.end());
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92
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93 t->join();
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94 bag->pimpl_->oneThreadIsJoined_.notify_one();
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95 }
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96
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97 bag->pimpl_->oneThreadIsStopped_.wait(lock);
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98 }
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99 }
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100
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101
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102 BagOfRunnablesBySteps::BagOfRunnablesBySteps() : pimpl_(new PImpl)
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103 {
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104 pimpl_->continue_ = true;
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105 pimpl_->stopFinishListener_ = false;
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106
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107 // Everyting is set up, the finish listener can be started
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108 pimpl_->finishListener_.reset(new boost::thread(FinishListener, this));
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109 }
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110
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111
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112 BagOfRunnablesBySteps::~BagOfRunnablesBySteps()
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113 {
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114 StopAll();
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115
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116 // Stop the finish listener
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117 pimpl_->stopFinishListener_ = true;
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118 pimpl_->oneThreadIsStopped_.notify_one(); // Awakens the listener
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119 pimpl_->finishListener_->join();
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120 }
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121
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122
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123 void BagOfRunnablesBySteps::Add(IRunnableBySteps* runnable)
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124 {
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125 // Make sure the runnable is deleted is something goes wrong
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126 std::auto_ptr<IRunnableBySteps> runnableRabi(runnable);
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127
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128 boost::mutex::scoped_lock lock(pimpl_->mutex_);
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129 boost::thread* t(new boost::thread(RunnableThread, this, runnable));
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130
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131 pimpl_->activeThreads_.insert(std::make_pair(runnableRabi.release(), t));
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132 }
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133
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134
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135 void BagOfRunnablesBySteps::StopAll()
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136 {
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137 boost::mutex::scoped_lock lock(pimpl_->mutex_);
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138 pimpl_->continue_ = false;
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139
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140 while (pimpl_->activeThreads_.size() > 0)
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141 {
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142 pimpl_->oneThreadIsJoined_.wait(lock);
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143 }
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144
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145 pimpl_->continue_ = true;
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146 }
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147 }
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