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annotate OrthancFramework/Sources/MultiThreading/Semaphore.h @ 5676:b744a2cf408a find-refactoring tip

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shorten ParentRetrieveSpecification/ChildrenRetrieveSpecification as ParentSpecification/ChildrenSpecification
author Sebastien Jodogne <s.jodogne@gmail.com>
date Sat, 06 Jul 2024 15:04:28 +0200
parents f7adfb22e20e
children
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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) 2017-2023 Osimis S.A., Belgium
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6 * Copyright (C) 2024-2024 Orthanc Team SRL, Belgium
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7 * Copyright (C) 2021-2024 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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8 *
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9 * This program is free software: you can redistribute it and/or
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10 * modify it under the terms of the GNU Lesser General Public License
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11 * as published by the Free Software Foundation, either version 3 of
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12 * the License, or (at your option) any later version.
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13 *
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14 * This program is distributed in the hope that it will be useful, but
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15 * WITHOUT ANY WARRANTY; without even the implied warranty of
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16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 * Lesser General Public License for more details.
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18 *
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19 * You should have received a copy of the GNU Lesser General Public
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20 * License along with this program. If not, see
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21 * <http://www.gnu.org/licenses/>.
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22 **/
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23
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24
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25 #pragma once
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26
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27 #include "../OrthancFramework.h"
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28
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29 #include <boost/noncopyable.hpp>
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30 #include <boost/thread.hpp>
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31
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32 namespace Orthanc
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33 {
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34 class ORTHANC_PUBLIC Semaphore : public boost::noncopyable
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35 {
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36 private:
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37 unsigned int availableResources_;
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38 boost::mutex mutex_;
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39 boost::condition_variable condition_;
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40
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41 public:
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42 explicit Semaphore(unsigned int availableResources);
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43
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44 unsigned int GetAvailableResourcesCount() const;
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45
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46 void Release(unsigned int resourceCount = 1);
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47
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48 void Acquire(unsigned int resourceCount = 1);
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49
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50 bool TryAcquire(unsigned int resourceCount = 1);
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51
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52 class Locker : public boost::noncopyable
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53 {
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54 private:
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55 Semaphore& that_;
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56 unsigned int resourceCount_;
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57
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58 public:
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59 explicit Locker(Semaphore& that, unsigned int resourceCount = 1) :
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60 that_(that),
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61 resourceCount_(resourceCount)
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62 {
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63 that_.Acquire(resourceCount_);
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64 }
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65
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66 ~Locker()
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67 {
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68 that_.Release(resourceCount_);
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69 }
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70 };
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71
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72 class TryLocker : public boost::noncopyable
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73 {
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74 private:
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75 Semaphore& that_;
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76 unsigned int resourceCount_;
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77 bool isAcquired_;
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78
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79 public:
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80 explicit TryLocker(Semaphore& that, unsigned int resourceCount = 1) :
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81 that_(that),
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82 resourceCount_(resourceCount)
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83 {
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84 isAcquired_ = that_.TryAcquire(resourceCount_);
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85 }
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86
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87 ~TryLocker()
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88 {
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89 if (isAcquired_)
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90 {
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91 that_.Release(resourceCount_);
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92 }
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93 }
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94
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95 bool IsAcquired() const
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96 {
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97 return isAcquired_;
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98 }
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99 };
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100
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101 };
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102 }