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annotate OrthancFramework/Sources/MultiThreading/Semaphore.h @ 5109:027366cae766

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author Alain Mazy <am@osimis.io>
date Tue, 22 Nov 2022 12:57:10 +0100
parents 43e613a7756b
children 0ea402b4d901
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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) 2017-2022 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2022 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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8 * This program is free software: you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public License
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Lesser General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Lesser General Public
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19 * License along with this program. If not, see
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20 * <http://www.gnu.org/licenses/>.
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21 **/
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22
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23
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24 #pragma once
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25
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26 #include "../OrthancFramework.h"
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27
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28 #include <boost/noncopyable.hpp>
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29 #include <boost/thread.hpp>
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30
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31 namespace Orthanc
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32 {
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33 class ORTHANC_PUBLIC Semaphore : public boost::noncopyable
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34 {
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35 private:
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36 unsigned int availableResources_;
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37 boost::mutex mutex_;
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38 boost::condition_variable condition_;
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39
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40 public:
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41 explicit Semaphore(unsigned int availableResources);
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42
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43 unsigned int GetAvailableResourcesCount() const;
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44
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45 void Release(unsigned int resourceCount = 1);
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46
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47 void Acquire(unsigned int resourceCount = 1);
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48
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49 bool TryAcquire(unsigned int resourceCount = 1);
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50
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51 class Locker : public boost::noncopyable
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52 {
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53 private:
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54 Semaphore& that_;
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55 unsigned int resourceCount_;
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56
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57 public:
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58 explicit Locker(Semaphore& that, unsigned int resourceCount = 1) :
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59 that_(that),
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60 resourceCount_(resourceCount)
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61 {
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62 that_.Acquire(resourceCount_);
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63 }
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64
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65 ~Locker()
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66 {
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67 that_.Release(resourceCount_);
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68 }
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69 };
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70
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71 class TryLocker : public boost::noncopyable
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72 {
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73 private:
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74 Semaphore& that_;
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75 unsigned int resourceCount_;
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76 bool isAcquired_;
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77
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78 public:
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79 explicit TryLocker(Semaphore& that, unsigned int resourceCount = 1) :
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80 that_(that),
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81 resourceCount_(resourceCount)
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82 {
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83 isAcquired_ = that_.TryAcquire(resourceCount_);
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84 }
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85
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86 ~TryLocker()
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87 {
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88 if (isAcquired_)
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89 {
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90 that_.Release(resourceCount_);
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91 }
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92 }
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93
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94 bool IsAcquired() const
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95 {
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96 return isAcquired_;
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97 }
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98 };
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99
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100 };
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101 }