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annotate Core/MultiThreading/SharedMessageQueue.cpp @ 3988:bdd8f952dd47

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playing with visibility
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 29 May 2020 19:02:32 +0200
parents 2a170a8f1faf
children
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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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) 2017-2020 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 "SharedMessageQueue.h"
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36
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37
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38 #include "../Compatibility.h"
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39
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41 /**
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42 * FIFO (queue):
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43 *
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44 * back front
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45 * +--+--+--+--+--+--+--+--+--+--+--+
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46 * Enqueue -> | | | | | | | | | | | |
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47 * | | | | | | | | | | | | -> Dequeue
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48 * +--+--+--+--+--+--+--+--+--+--+--+
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49 * ^
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50 * |
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51 * Make room here
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52 *
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53 *
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54 * LIFO (stack):
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55 *
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56 * back front
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57 * +--+--+--+--+--+--+--+--+--+--+--+
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58 * | | | | | | | | | | | | <- Enqueue
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59 * | | | | | | | | | | | | -> Dequeue
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60 * +--+--+--+--+--+--+--+--+--+--+--+
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61 * ^
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62 * |
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63 * Make room here
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64 **/
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65
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66
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67 namespace Orthanc
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68 {
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69 SharedMessageQueue::SharedMessageQueue(unsigned int maxSize) :
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70 isFifo_(true),
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71 maxSize_(maxSize)
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72 {
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73 }
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74
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75
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76 SharedMessageQueue::~SharedMessageQueue()
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77 {
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78 for (Queue::iterator it = queue_.begin(); it != queue_.end(); ++it)
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79 {
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80 delete *it;
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81 }
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82 }
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83
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84
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85 void SharedMessageQueue::Enqueue(IDynamicObject* message)
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86 {
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87 boost::mutex::scoped_lock lock(mutex_);
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88
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89 if (maxSize_ != 0 && queue_.size() > maxSize_)
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90 {
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91 if (isFifo_)
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92 {
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93 // Too many elements in the queue: Make room
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94 delete queue_.front();
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95 queue_.pop_front();
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96 }
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97 else
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98 {
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99 // Too many elements in the stack: Make room
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100 delete queue_.back();
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101 queue_.pop_back();
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102 }
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103 }
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104
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105 if (isFifo_)
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106 {
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107 // Queue policy (FIFO)
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108 queue_.push_back(message);
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109 }
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110 else
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111 {
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112 // Stack policy (LIFO)
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113 queue_.push_front(message);
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114 }
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115
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116 elementAvailable_.notify_one();
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117 }
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118
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119
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120 IDynamicObject* SharedMessageQueue::Dequeue(int32_t millisecondsTimeout)
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121 {
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122 boost::mutex::scoped_lock lock(mutex_);
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123
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124 // Wait for a message to arrive in the FIFO queue
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125 while (queue_.empty())
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126 {
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127 if (millisecondsTimeout == 0)
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128 {
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129 elementAvailable_.wait(lock);
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130 }
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131 else
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132 {
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133 bool success = elementAvailable_.timed_wait
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134 (lock, boost::posix_time::milliseconds(millisecondsTimeout));
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135 if (!success)
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136 {
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137 return NULL;
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138 }
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139 }
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140 }
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141
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142 std::unique_ptr<IDynamicObject> message(queue_.front());
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143 queue_.pop_front();
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144
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145 if (queue_.empty())
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146 {
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147 emptied_.notify_all();
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148 }
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149
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150 return message.release();
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151 }
452
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152
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153
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154
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155 bool SharedMessageQueue::WaitEmpty(int32_t millisecondsTimeout)
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156 {
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157 boost::mutex::scoped_lock lock(mutex_);
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158
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159 // Wait for the queue to become empty
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160 while (!queue_.empty())
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161 {
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162 if (millisecondsTimeout == 0)
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163 {
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164 emptied_.wait(lock);
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165 }
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166 else
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167 {
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168 if (!emptied_.timed_wait
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169 (lock, boost::posix_time::milliseconds(millisecondsTimeout)))
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170 {
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171 return false;
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172 }
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173 }
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174 }
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175
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176 return true;
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177 }
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178
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179
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180 void SharedMessageQueue::SetFifoPolicy()
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181 {
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182 boost::mutex::scoped_lock lock(mutex_);
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183 isFifo_ = true;
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184 }
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185
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186 void SharedMessageQueue::SetLifoPolicy()
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187 {
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188 boost::mutex::scoped_lock lock(mutex_);
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189 isFifo_ = false;
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190 }
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191
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192 void SharedMessageQueue::Clear()
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193 {
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194 boost::mutex::scoped_lock lock(mutex_);
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195
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196 if (queue_.empty())
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197 {
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198 return;
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199 }
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200 else
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201 {
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202 while (!queue_.empty())
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203 {
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204 std::unique_ptr<IDynamicObject> message(queue_.front());
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205 queue_.pop_front();
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206 }
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207
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208 emptied_.notify_all();
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209 }
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210 }
450
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211 }