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annotate OrthancFramework/Sources/MultiThreading/Semaphore.h @ 4334:b2366bc023f8

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Fix access to videos as a single raw frame
author Sebastien Jodogne <s.jodogne@gmail.com>
date Mon, 30 Nov 2020 16:33:40 +0100
parents b30a8de92ad9
children d9473bd5ed43
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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) 2017-2020 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Lesser General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Lesser General Public
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18 * License along with this program. If not, see
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19 * <http://www.gnu.org/licenses/>.
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20 **/
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21
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22
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23 #pragma once
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24
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25 #include "../OrthancFramework.h"
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26
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27 #include <boost/noncopyable.hpp>
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28 #include <boost/thread.hpp>
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29
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30 namespace Orthanc
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31 {
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32 class ORTHANC_PUBLIC Semaphore : public boost::noncopyable
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33 {
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34 private:
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35 unsigned int availableResources_;
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36 boost::mutex mutex_;
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37 boost::condition_variable condition_;
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38
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39 void Release(unsigned int resourceCount = 1);
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40
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41 void Acquire(unsigned int resourceCount = 1);
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42
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43 bool TryAcquire(unsigned int resourceCount = 1);
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44 public:
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45 explicit Semaphore(unsigned int availableResources);
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46
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47 unsigned int GetAvailableResourcesCount() const;
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48
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49
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50 class Locker : public boost::noncopyable
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51 {
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52 private:
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53 Semaphore& that_;
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54 unsigned int resourceCount_;
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55
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56 public:
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57 explicit Locker(Semaphore& that, unsigned int resourceCount = 1) :
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58 that_(that),
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59 resourceCount_(resourceCount)
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60 {
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61 that_.Acquire(resourceCount_);
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62 }
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63
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64 ~Locker()
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65 {
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66 that_.Release(resourceCount_);
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67 }
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68 };
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69
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70 class TryLocker : public boost::noncopyable
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71 {
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72 private:
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73 Semaphore& that_;
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74 unsigned int resourceCount_;
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75 bool isAcquired_;
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76
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77 public:
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78 explicit TryLocker(Semaphore& that, unsigned int resourceCount = 1) :
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79 that_(that),
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80 resourceCount_(resourceCount)
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81 {
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82 isAcquired_ = that_.TryAcquire(resourceCount_);
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83 }
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84
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85 ~TryLocker()
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86 {
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87 if (isAcquired_)
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88 {
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89 that_.Release(resourceCount_);
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90 }
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91 }
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92
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93 bool IsAcquired() const
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94 {
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95 return isAcquired_;
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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 }