annotate OrthancFramework/Resources/Graveyard/Multithreading/ReaderWriterLock.cpp @ 4119:bf7b9edf6b81 framework-lgpl

re-licensing the OrthancFramework to LGPL, in order to license Stone of Orthanc under LGPL
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 07 Jul 2020 19:17:56 +0200
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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 Lesser General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Lesser General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Lesser General Public
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18 * License along with this program. If not, see
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19 * <http://www.gnu.org/licenses/>.
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20 **/
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21
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22
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23 #include "../PrecompiledHeaders.h"
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24 #include "ReaderWriterLock.h"
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25
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26 #include <boost/thread/shared_mutex.hpp>
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27
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28 namespace Orthanc
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29 {
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30 namespace
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31 {
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32 // Anonymous namespace to avoid clashes between compilation
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33 // modules.
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34
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35 class ReaderLockable : public ILockable
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36 {
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37 private:
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38 boost::shared_mutex& lock_;
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39
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40 protected:
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41 virtual void Lock()
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42 {
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43 lock_.lock_shared();
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44 }
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45
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46 virtual void Unlock()
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47 {
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48 lock_.unlock_shared();
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49 }
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50
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51 public:
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52 explicit ReaderLockable(boost::shared_mutex& lock) : lock_(lock)
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53 {
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54 }
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55 };
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56
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57
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58 class WriterLockable : public ILockable
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59 {
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60 private:
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61 boost::shared_mutex& lock_;
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62
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63 protected:
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64 virtual void Lock()
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65 {
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66 lock_.lock();
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67 }
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68
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69 virtual void Unlock()
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70 {
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71 lock_.unlock();
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72 }
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73
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74 public:
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75 explicit WriterLockable(boost::shared_mutex& lock) : lock_(lock)
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76 {
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77 }
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78 };
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79 }
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80
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81 struct ReaderWriterLock::PImpl
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82 {
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83 boost::shared_mutex lock_;
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84 ReaderLockable reader_;
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85 WriterLockable writer_;
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86
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87 PImpl() : reader_(lock_), writer_(lock_)
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88 {
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89 }
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90 };
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91
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92
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93 ReaderWriterLock::ReaderWriterLock()
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94 {
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95 pimpl_ = new PImpl;
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96 }
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97
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98
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99 ReaderWriterLock::~ReaderWriterLock()
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100 {
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101 delete pimpl_;
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102 }
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103
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104
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105 ILockable& ReaderWriterLock::ForReader()
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106 {
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107 return pimpl_->reader_;
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108 }
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109
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110
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111 ILockable& ReaderWriterLock::ForWriter()
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112 {
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113 return pimpl_->writer_;
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114 }
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115 }