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annotate Core/MultiThreading/Semaphore.cpp @ 1900:b1291df2f780

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2016
author Sebastien Jodogne <s.jodogne@gmail.com>
date Mon, 04 Jan 2016 13:17:22 +0100
parents 0a2ad4a6858f
children ed383e7a6753
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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 *
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6 * This program is free software: you can redistribute it and/or
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7 * modify it under the terms of the GNU General Public License as
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8 * published by the Free Software Foundation, either version 3 of the
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9 * License, or (at your option) any later version.
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10 *
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11 * In addition, as a special exception, the copyright holders of this
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12 * program give permission to link the code of its release with the
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13 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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14 * that use the same license as the "OpenSSL" library), and distribute
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15 * the linked executables. You must obey the GNU General Public License
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16 * in all respects for all of the code used other than "OpenSSL". If you
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17 * modify file(s) with this exception, you may extend this exception to
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18 * your version of the file(s), but you are not obligated to do so. If
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19 * you do not wish to do so, delete this exception statement from your
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20 * version. If you delete this exception statement from all source files
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21 * in the program, then also delete it here.
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22 *
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23 * This program is distributed in the hope that it will be useful, but
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24 * WITHOUT ANY WARRANTY; without even the implied warranty of
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25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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26 * General Public License for more details.
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27 *
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28 * You should have received a copy of the GNU General Public License
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29 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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30 **/
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31
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32
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33 #include "../PrecompiledHeaders.h"
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34 #include "Semaphore.h"
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35
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36 #include "../OrthancException.h"
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37
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38
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39 namespace Orthanc
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40 {
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41 Semaphore::Semaphore(unsigned int count) : count_(count)
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42 {
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43 if (count == 0)
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44 {
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45 throw OrthancException(ErrorCode_ParameterOutOfRange);
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46 }
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47 }
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48
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49 void Semaphore::Release()
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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 count_++;
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54 condition_.notify_one();
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55 }
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56
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57 void Semaphore::Acquire()
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58 {
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59 boost::mutex::scoped_lock lock(mutex_);
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60
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61 while (count_ == 0)
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62 {
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63 condition_.wait(lock);
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64 }
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65
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66 count_++;
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67 }
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68 }