Mercurial > hg > orthanc
comparison OrthancFramework/Sources/MultiThreading/Semaphore.h @ 4044:d25f4c0fa160 framework
splitting code into OrthancFramework and OrthancServer
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Wed, 10 Jun 2020 20:30:34 +0200 |
parents | Core/MultiThreading/Semaphore.h@94f4a18a79cc |
children | 408ac60c3cf8 |
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4043:6c6239aec462 | 4044:d25f4c0fa160 |
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1 /** | |
2 * Orthanc - A Lightweight, RESTful DICOM Store | |
3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics | |
4 * Department, University Hospital of Liege, Belgium | |
5 * Copyright (C) 2017-2020 Osimis S.A., Belgium | |
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 | |
34 #pragma once | |
35 | |
36 #include <boost/noncopyable.hpp> | |
37 #include <boost/thread.hpp> | |
38 | |
39 namespace Orthanc | |
40 { | |
41 class Semaphore : public boost::noncopyable | |
42 { | |
43 private: | |
44 unsigned int availableResources_; | |
45 boost::mutex mutex_; | |
46 boost::condition_variable condition_; | |
47 | |
48 void Release(); | |
49 | |
50 void Acquire(); | |
51 | |
52 bool TryAcquire(); | |
53 public: | |
54 explicit Semaphore(unsigned int availableResources); | |
55 | |
56 unsigned int GetAvailableResourcesCount() const | |
57 { | |
58 return availableResources_; | |
59 } | |
60 | |
61 | |
62 class Locker : public boost::noncopyable | |
63 { | |
64 private: | |
65 Semaphore& that_; | |
66 | |
67 public: | |
68 explicit Locker(Semaphore& that) : | |
69 that_(that) | |
70 { | |
71 that_.Acquire(); | |
72 } | |
73 | |
74 ~Locker() | |
75 { | |
76 that_.Release(); | |
77 } | |
78 }; | |
79 | |
80 class TryLocker : public boost::noncopyable | |
81 { | |
82 private: | |
83 Semaphore& that_; | |
84 bool isAcquired_; | |
85 | |
86 public: | |
87 explicit TryLocker(Semaphore& that) : | |
88 that_(that) | |
89 { | |
90 isAcquired_ = that_.TryAcquire(); | |
91 } | |
92 | |
93 ~TryLocker() | |
94 { | |
95 if (isAcquired_) | |
96 { | |
97 that_.Release(); | |
98 } | |
99 } | |
100 | |
101 bool IsAcquired() const | |
102 { | |
103 return isAcquired_; | |
104 } | |
105 }; | |
106 | |
107 }; | |
108 } |