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annotate Core/MultiThreading/Semaphore.h @ 3686:a79aecf1f9ae

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Mon, 24 Feb 2020 18:09:38 +0100
parents 94f4a18a79cc
children 7176ebf08765
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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 General Public License as
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9 * published by the Free Software Foundation, either version 3 of the
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10 * License, or (at your option) any later version.
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11 *
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12 * In addition, as a special exception, the copyright holders of this
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13 * program give permission to link the code of its release with the
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14 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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15 * that use the same license as the "OpenSSL" library), and distribute
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16 * the linked executables. You must obey the GNU General Public License
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17 * in all respects for all of the code used other than "OpenSSL". If you
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18 * modify file(s) with this exception, you may extend this exception to
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19 * your version of the file(s), but you are not obligated to do so. If
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20 * you do not wish to do so, delete this exception statement from your
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21 * version. If you delete this exception statement from all source files
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22 * in the program, then also delete it here.
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23 *
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24 * This program is distributed in the hope that it will be useful, but
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25 * WITHOUT ANY WARRANTY; without even the implied warranty of
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26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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27 * General Public License for more details.
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28 *
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29 * You should have received a copy of the GNU General Public License
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30 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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31 **/
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32
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33
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34 #pragma once
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35
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36 #include <boost/noncopyable.hpp>
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37 #include <boost/thread.hpp>
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38
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39 namespace Orthanc
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40 {
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41 class Semaphore : public boost::noncopyable
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42 {
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43 private:
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44 unsigned int availableResources_;
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45 boost::mutex mutex_;
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46 boost::condition_variable condition_;
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47
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48 void Release();
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49
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50 void Acquire();
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51
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52 bool TryAcquire();
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53 public:
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54 explicit Semaphore(unsigned int availableResources);
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55
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56 unsigned int GetAvailableResourcesCount() const
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57 {
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58 return availableResources_;
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59 }
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60
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61
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62 class Locker : public boost::noncopyable
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63 {
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64 private:
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65 Semaphore& that_;
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66
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67 public:
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68 explicit Locker(Semaphore& that) :
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69 that_(that)
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70 {
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71 that_.Acquire();
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72 }
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73
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74 ~Locker()
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75 {
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76 that_.Release();
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77 }
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78 };
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79
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80 class TryLocker : public boost::noncopyable
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81 {
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82 private:
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83 Semaphore& that_;
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84 bool isAcquired_;
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85
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86 public:
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87 explicit TryLocker(Semaphore& that) :
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88 that_(that)
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89 {
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90 isAcquired_ = that_.TryAcquire();
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91 }
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92
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93 ~TryLocker()
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94 {
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95 if (isAcquired_)
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96 {
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97 that_.Release();
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98 }
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99 }
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100
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101 bool IsAcquired() const
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102 {
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103 return isAcquired_;
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104 }
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105 };
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106
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107 };
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108 }