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annotate Core/MultiThreading/Semaphore.cpp @ 4064:7176ebf08765

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Semaphore: allow acquiring/releasing multiple resources
author Alain Mazy
date Thu, 11 Jun 2020 16:42:27 +0200
parents 94f4a18a79cc
children
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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 #include "../PrecompiledHeaders.h"
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35 #include "Semaphore.h"
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36
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37 #include "../OrthancException.h"
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38
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39
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40 namespace Orthanc
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41 {
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42 Semaphore::Semaphore(unsigned int availableResources) :
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43 availableResources_(availableResources)
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44 {
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45 if (availableResources_ == 0)
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46 {
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47 throw OrthancException(ErrorCode_ParameterOutOfRange);
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48 }
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49 }
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50
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51 void Semaphore::Release(unsigned int resourceCount)
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52 {
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53 boost::mutex::scoped_lock lock(mutex_);
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54
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55 availableResources_ += resourceCount;
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56 condition_.notify_one();
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57 }
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58
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59 void Semaphore::Acquire(unsigned int resourceCount)
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60 {
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61 boost::mutex::scoped_lock lock(mutex_);
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62
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63 while (availableResources_ < resourceCount)
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64 {
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65 condition_.wait(lock);
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66 }
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67
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68 availableResources_ -= resourceCount;
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69 }
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70
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71 bool Semaphore::TryAcquire(unsigned int resourceCount)
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72 {
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73 boost::mutex::scoped_lock lock(mutex_);
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74
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75 if (availableResources_ < resourceCount)
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76 {
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77 return false;
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78 }
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79
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80 availableResources_ -= resourceCount;
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81 return true;
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82 }
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83 }