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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2014 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 * In addition, as a special exception, the copyright holders of this
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12 * program give permission to link the code of its release with the
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13 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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14 * that use the same license as the "OpenSSL" library), and distribute
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15 * the linked executables. You must obey the GNU General Public License
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16 * in all respects for all of the code used other than "OpenSSL". If you
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17 * modify file(s) with this exception, you may extend this exception to
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18 * your version of the file(s), but you are not obligated to do so. If
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19 * you do not wish to do so, delete this exception statement from your
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20 * version. If you delete this exception statement from all source files
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21 * in the program, then also delete it here.
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22 *
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23 * This program is distributed in the hope that it will be useful, but
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24 * WITHOUT ANY WARRANTY; without even the implied warranty of
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25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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26 * General Public License for more details.
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27 *
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28 * You should have received a copy of the GNU General Public License
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29 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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30 **/
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31
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32
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33 #include "ReaderWriterLock.h"
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34
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35 #include <boost/thread/shared_mutex.hpp>
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36
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37 namespace Orthanc
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38 {
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39 namespace
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40 {
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41 // Anonymous namespace to avoid clashes between compilation
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42 // modules.
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43
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44 class ReaderLockable : public ILockable
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45 {
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46 private:
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47 boost::shared_mutex& lock_;
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48
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49 public:
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50 ReaderLockable(boost::shared_mutex& lock) : lock_(lock)
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51 {
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52 }
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53
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54 virtual void Lock()
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55 {
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56 lock_.lock_shared();
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57 }
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58
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59 virtual void Unlock()
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60 {
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61 lock_.unlock_shared();
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62 }
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63 };
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64
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65
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66 class WriterLockable : public ILockable
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67 {
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68 private:
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69 boost::shared_mutex& lock_;
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70
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71 public:
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72 WriterLockable(boost::shared_mutex& lock) : lock_(lock)
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73 {
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74 }
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75
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76 virtual void Lock()
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77 {
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78 lock_.lock();
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79 }
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80
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81 virtual void Unlock()
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82 {
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83 lock_.unlock();
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84 }
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85 };
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86 }
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87
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88 struct ReaderWriterLock::PImpl
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89 {
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90 boost::shared_mutex lock_;
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91 ReaderLockable reader_;
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92 WriterLockable writer_;
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93
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94 PImpl() : reader_(lock_), writer_(lock_)
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95 {
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96 }
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97 };
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98
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99
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100 ReaderWriterLock::ReaderWriterLock()
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101 {
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102 pimpl_ = new PImpl;
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103 }
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104
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105
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106 ReaderWriterLock::~ReaderWriterLock()
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107 {
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108 delete pimpl_;
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109 }
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110
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111
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112 ILockable& ReaderWriterLock::ForReader()
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113 {
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114 return pimpl_->reader_;
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115 }
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116
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117
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118 ILockable& ReaderWriterLock::ForWriter()
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119 {
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120 return pimpl_->writer_;
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121 }
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122 }
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