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comparison Core/MultiThreading/ReaderWriterLock.cpp @ 760:b2a62f22fbe8

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lock abstraction
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 22 Apr 2014 13:36:51 +0200
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children 3f946e5c3802
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757:40d09221077a 760:b2a62f22fbe8
1 /**
2 * Orthanc - A Lightweight, RESTful DICOM Store
3 * Copyright (C) 2012-2014 Medical Physics Department, CHU of Liege,
4 * Belgium
5 *
6 * This program is free software: you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation, either version 3 of the
9 * License, or (at your option) any later version.
10 *
11 * In addition, as a special exception, the copyright holders of this
12 * program give permission to link the code of its release with the
13 * OpenSSL project's "OpenSSL" library (or with modified versions of it
14 * that use the same license as the "OpenSSL" library), and distribute
15 * the linked executables. You must obey the GNU General Public License
16 * in all respects for all of the code used other than "OpenSSL". If you
17 * modify file(s) with this exception, you may extend this exception to
18 * your version of the file(s), but you are not obligated to do so. If
19 * you do not wish to do so, delete this exception statement from your
20 * version. If you delete this exception statement from all source files
21 * in the program, then also delete it here.
22 *
23 * This program is distributed in the hope that it will be useful, but
24 * WITHOUT ANY WARRANTY; without even the implied warranty of
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
26 * General Public License for more details.
27 *
28 * You should have received a copy of the GNU General Public License
29 * along with this program. If not, see <http://www.gnu.org/licenses/>.
30 **/
31
32
33 #include "ReaderWriterLock.h"
34
35 #include <boost/thread/shared_mutex.hpp>
36
37 namespace Orthanc
38 {
39 namespace
40 {
41 // Anonymous namespace to avoid clashes between compilation
42 // modules.
43
44 class ReaderLockable : public ILockable
45 {
46 private:
47 boost::shared_mutex& lock_;
48
49 public:
50 ReaderLockable(boost::shared_mutex& lock) : lock_(lock)
51 {
52 }
53
54 virtual void Lock()
55 {
56 lock_.lock_shared();
57 }
58
59 virtual void Unlock()
60 {
61 lock_.unlock_shared();
62 }
63 };
64
65
66 class WriterLockable : public ILockable
67 {
68 private:
69 boost::shared_mutex& lock_;
70
71 public:
72 WriterLockable(boost::shared_mutex& lock) : lock_(lock)
73 {
74 }
75
76 virtual void Lock()
77 {
78 lock_.lock();
79 }
80
81 virtual void Unlock()
82 {
83 lock_.unlock();
84 }
85 };
86 }
87
88 struct ReaderWriterLock::PImpl
89 {
90 boost::shared_mutex lock_;
91 ReaderLockable reader_;
92 WriterLockable writer_;
93
94 PImpl() : reader_(lock_), writer_(lock_)
95 {
96 }
97 };
98
99
100 ReaderWriterLock::ReaderWriterLock()
101 {
102 pimpl_ = new PImpl;
103 }
104
105
106 ReaderWriterLock::~ReaderWriterLock()
107 {
108 delete pimpl_;
109 }
110
111
112 ILockable& ReaderWriterLock::ForReader()
113 {
114 return pimpl_->reader_;
115 }
116
117
118 ILockable& ReaderWriterLock::ForWriter()
119 {
120 return pimpl_->writer_;
121 }
122 }