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annotate OrthancFramework/Sources/MultiThreading/Semaphore.cpp @ 4300:b30a8de92ad9

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 05 Nov 2020 19:33:18 +0100
parents bf7b9edf6b81
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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22
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23 #include "../PrecompiledHeaders.h"
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24 #include "Semaphore.h"
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25
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26 #include "../OrthancException.h"
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27
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28
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29 namespace Orthanc
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30 {
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31 Semaphore::Semaphore(unsigned int availableResources) :
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32 availableResources_(availableResources)
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33 {
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34 if (availableResources_ == 0)
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35 {
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36 throw OrthancException(ErrorCode_ParameterOutOfRange);
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37 }
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38 }
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39
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40 unsigned int Semaphore::GetAvailableResourcesCount() const
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41 {
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42 return availableResources_;
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43 }
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44
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45 void Semaphore::Release(unsigned int resourceCount)
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46 {
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47 boost::mutex::scoped_lock lock(mutex_);
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48
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49 availableResources_ += resourceCount;
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50 condition_.notify_one();
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51 }
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52
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53 void Semaphore::Acquire(unsigned int resourceCount)
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54 {
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55 boost::mutex::scoped_lock lock(mutex_);
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56
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57 while (availableResources_ < resourceCount)
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58 {
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59 condition_.wait(lock);
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60 }
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61
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62 availableResources_ -= resourceCount;
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63 }
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64
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65 bool Semaphore::TryAcquire(unsigned int resourceCount)
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66 {
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67 boost::mutex::scoped_lock lock(mutex_);
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68
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69 if (availableResources_ < resourceCount)
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70 {
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71 return false;
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72 }
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73
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74 availableResources_ -= resourceCount;
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75 return true;
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76 }
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77 }