Mercurial > hg > orthanc
annotate OrthancFramework/Sources/MultiThreading/Semaphore.cpp @ 4817:b8fcd331b4b3
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author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Thu, 25 Nov 2021 13:09:15 +0100 |
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1 /** |
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2 * Orthanc - A Lightweight, RESTful DICOM Store |
1900 | 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) 2017-2021 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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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 } |
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35 |
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37 { | |
38 return availableResources_; | |
39 } | |
40 | |
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41 void Semaphore::Release(unsigned int resourceCount) |
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42 { |
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43 boost::mutex::scoped_lock lock(mutex_); |
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44 |
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45 availableResources_ += resourceCount; |
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46 condition_.notify_one(); |
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47 } |
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48 |
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49 void Semaphore::Acquire(unsigned int resourceCount) |
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50 { |
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51 boost::mutex::scoped_lock lock(mutex_); |
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52 |
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53 while (availableResources_ < resourceCount) |
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54 { |
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55 condition_.wait(lock); |
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56 } |
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57 |
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58 availableResources_ -= resourceCount; |
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59 } |
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60 |
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61 bool Semaphore::TryAcquire(unsigned int resourceCount) |
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62 { |
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63 boost::mutex::scoped_lock lock(mutex_); |
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64 |
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65 if (availableResources_ < resourceCount) |
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66 { |
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67 return false; |
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68 } |
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69 |
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70 availableResources_ -= resourceCount; |
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71 return true; |
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72 } |
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73 } |