Mercurial > hg > orthanc
view OrthancFramework/Sources/MultiThreading/Semaphore.h @ 4106:50cb0fb99e34
added license headers
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Mon, 06 Jul 2020 19:24:22 +0200 |
parents | d5c09b5f882f |
children | bf7b9edf6b81 |
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/** * Orthanc - A Lightweight, RESTful DICOM Store * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics * Department, University Hospital of Liege, Belgium * Copyright (C) 2017-2020 Osimis S.A., Belgium * * This program is free software: you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation, either version 3 of the * License, or (at your option) any later version. * * In addition, as a special exception, the copyright holders of this * program give permission to link the code of its release with the * OpenSSL project's "OpenSSL" library (or with modified versions of it * that use the same license as the "OpenSSL" library), and distribute * the linked executables. You must obey the GNU General Public License * in all respects for all of the code used other than "OpenSSL". If you * modify file(s) with this exception, you may extend this exception to * your version of the file(s), but you are not obligated to do so. If * you do not wish to do so, delete this exception statement from your * version. If you delete this exception statement from all source files * in the program, then also delete it here. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. **/ #pragma once #include "../OrthancFramework.h" #include <boost/noncopyable.hpp> #include <boost/thread.hpp> namespace Orthanc { class ORTHANC_PUBLIC Semaphore : public boost::noncopyable { private: unsigned int availableResources_; boost::mutex mutex_; boost::condition_variable condition_; void Release(unsigned int resourceCount = 1); void Acquire(unsigned int resourceCount = 1); bool TryAcquire(unsigned int resourceCount = 1); public: explicit Semaphore(unsigned int availableResources); unsigned int GetAvailableResourcesCount() const { return availableResources_; } class Locker : public boost::noncopyable { private: Semaphore& that_; unsigned int resourceCount_; public: explicit Locker(Semaphore& that, unsigned int resourceCount = 1) : that_(that), resourceCount_(resourceCount) { that_.Acquire(resourceCount_); } ~Locker() { that_.Release(resourceCount_); } }; class TryLocker : public boost::noncopyable { private: Semaphore& that_; unsigned int resourceCount_; bool isAcquired_; public: explicit TryLocker(Semaphore& that, unsigned int resourceCount = 1) : that_(that), resourceCount_(resourceCount) { isAcquired_ = that_.TryAcquire(resourceCount_); } ~TryLocker() { if (isAcquired_) { that_.Release(resourceCount_); } } bool IsAcquired() const { return isAcquired_; } }; }; }