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annotate OrthancFramework/Sources/MultiThreading/Semaphore.cpp @ 5038:f8bea9c1c0fc

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reduce dependencies to DCMTK (e.g. for plugins)
author Alain Mazy <am@osimis.io>
date Fri, 24 Jun 2022 16:44:38 +0200
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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24 #include "../PrecompiledHeaders.h"
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25 #include "Semaphore.h"
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26
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27 #include "../OrthancException.h"
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29
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30 namespace Orthanc
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31 {
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32 Semaphore::Semaphore(unsigned int availableResources) :
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33 availableResources_(availableResources)
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34 {
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35 }
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36
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37 unsigned int Semaphore::GetAvailableResourcesCount() const
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38 {
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39 return availableResources_;
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40 }
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41
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42 void Semaphore::Release(unsigned int resourceCount)
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43 {
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44 boost::mutex::scoped_lock lock(mutex_);
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45
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46 availableResources_ += resourceCount;
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47 condition_.notify_one();
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48 }
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49
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50 void Semaphore::Acquire(unsigned int resourceCount)
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51 {
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52 boost::mutex::scoped_lock lock(mutex_);
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53
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54 while (availableResources_ < resourceCount)
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55 {
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56 condition_.wait(lock);
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57 }
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58
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59 availableResources_ -= resourceCount;
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60 }
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61
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62 bool Semaphore::TryAcquire(unsigned int resourceCount)
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63 {
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64 boost::mutex::scoped_lock lock(mutex_);
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65
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66 if (availableResources_ < resourceCount)
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67 {
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68 return false;
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69 }
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70
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71 availableResources_ -= resourceCount;
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72 return true;
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73 }
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74 }