Mercurial > hg > orthanc
annotate Core/MultiThreading/SharedMessageQueue.cpp @ 3712:2a170a8f1faf
replacing std::auto_ptr by std::unique_ptr
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Mon, 02 Mar 2020 15:32:45 +0100 |
parents | 94f4a18a79cc |
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rev | line source |
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450 | 1 /** |
2 * Orthanc - A Lightweight, RESTful DICOM Store | |
1900 | 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 |
450 | 6 * |
7 * This program is free software: you can redistribute it and/or | |
8 * modify it under the terms of the GNU General Public License as | |
9 * published by the Free Software Foundation, either version 3 of the | |
10 * License, or (at your option) any later version. | |
11 * | |
12 * In addition, as a special exception, the copyright holders of this | |
13 * program give permission to link the code of its release with the | |
14 * OpenSSL project's "OpenSSL" library (or with modified versions of it | |
15 * that use the same license as the "OpenSSL" library), and distribute | |
16 * the linked executables. You must obey the GNU General Public License | |
17 * in all respects for all of the code used other than "OpenSSL". If you | |
18 * modify file(s) with this exception, you may extend this exception to | |
19 * your version of the file(s), but you are not obligated to do so. If | |
20 * you do not wish to do so, delete this exception statement from your | |
21 * version. If you delete this exception statement from all source files | |
22 * in the program, then also delete it here. | |
23 * | |
24 * This program is distributed in the hope that it will be useful, but | |
25 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
27 * General Public License for more details. | |
28 * | |
29 * You should have received a copy of the GNU General Public License | |
30 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
31 **/ | |
32 | |
33 | |
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34 #include "../PrecompiledHeaders.h" |
450 | 35 #include "SharedMessageQueue.h" |
36 | |
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37 |
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38 #include "../Compatibility.h" |
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39 |
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40 |
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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 |
450 | 67 namespace Orthanc |
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) |
450 | 72 { |
73 } | |
74 | |
75 | |
76 SharedMessageQueue::~SharedMessageQueue() | |
77 { | |
656 | 78 for (Queue::iterator it = queue_.begin(); it != queue_.end(); ++it) |
450 | 79 { |
80 delete *it; | |
81 } | |
82 } | |
83 | |
84 | |
85 void SharedMessageQueue::Enqueue(IDynamicObject* message) | |
86 { | |
87 boost::mutex::scoped_lock lock(mutex_); | |
88 | |
89 if (maxSize_ != 0 && queue_.size() > maxSize_) | |
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 } |
450 | 103 } |
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 |
450 | 116 elementAvailable_.notify_one(); |
117 } | |
118 | |
119 | |
120 IDynamicObject* SharedMessageQueue::Dequeue(int32_t millisecondsTimeout) | |
121 { | |
122 boost::mutex::scoped_lock lock(mutex_); | |
123 | |
124 // Wait for a message to arrive in the FIFO queue | |
125 while (queue_.empty()) | |
126 { | |
127 if (millisecondsTimeout == 0) | |
128 { | |
129 elementAvailable_.wait(lock); | |
130 } | |
131 else | |
132 { | |
133 bool success = elementAvailable_.timed_wait | |
134 (lock, boost::posix_time::milliseconds(millisecondsTimeout)); | |
135 if (!success) | |
136 { | |
137 return NULL; | |
138 } | |
139 } | |
140 } | |
141 | |
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142 std::unique_ptr<IDynamicObject> message(queue_.front()); |
450 | 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 } |
450 | 149 |
150 return message.release(); | |
151 } | |
452 | 152 |
153 | |
154 | |
155 bool SharedMessageQueue::WaitEmpty(int32_t millisecondsTimeout) | |
156 { | |
157 boost::mutex::scoped_lock lock(mutex_); | |
158 | |
159 // Wait for the queue to become empty | |
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160 while (!queue_.empty()) |
452 | 161 { |
162 if (millisecondsTimeout == 0) | |
163 { | |
164 emptied_.wait(lock); | |
165 } | |
166 else | |
167 { | |
168 if (!emptied_.timed_wait | |
169 (lock, boost::posix_time::milliseconds(millisecondsTimeout))) | |
170 { | |
171 return false; | |
172 } | |
173 } | |
174 } | |
175 | |
176 return true; | |
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 | 211 } |