103 lines
2.5 KiB
C++
103 lines
2.5 KiB
C++
/**
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* Orthanc - A Lightweight, RESTful DICOM Store
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* Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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* Department, University Hospital of Liege, Belgium
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* Copyright (C) 2017-2023 Osimis S.A., Belgium
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* Copyright (C) 2024-2025 Orthanc Team SRL, Belgium
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* Copyright (C) 2021-2025 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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*
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* This program is free software: you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program. If not, see
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* <http://www.gnu.org/licenses/>.
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**/
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#pragma once
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#include "../OrthancFramework.h"
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#include <boost/noncopyable.hpp>
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#include <boost/thread.hpp>
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namespace Orthanc
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{
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class ORTHANC_PUBLIC Semaphore : public boost::noncopyable
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{
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private:
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unsigned int availableResources_;
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boost::mutex mutex_;
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boost::condition_variable condition_;
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public:
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explicit Semaphore(unsigned int availableResources);
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unsigned int GetAvailableResourcesCount() const;
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void Release(unsigned int resourceCount = 1);
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void Acquire(unsigned int resourceCount = 1);
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bool TryAcquire(unsigned int resourceCount = 1);
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class Locker : public boost::noncopyable
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{
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private:
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Semaphore& that_;
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unsigned int resourceCount_;
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public:
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explicit Locker(Semaphore& that, unsigned int resourceCount = 1) :
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that_(that),
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resourceCount_(resourceCount)
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{
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that_.Acquire(resourceCount_);
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}
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~Locker()
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{
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that_.Release(resourceCount_);
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}
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};
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class TryLocker : public boost::noncopyable
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{
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private:
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Semaphore& that_;
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unsigned int resourceCount_;
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bool isAcquired_;
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public:
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explicit TryLocker(Semaphore& that, unsigned int resourceCount = 1) :
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that_(that),
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resourceCount_(resourceCount)
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{
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isAcquired_ = that_.TryAcquire(resourceCount_);
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}
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~TryLocker()
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{
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if (isAcquired_)
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{
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that_.Release(resourceCount_);
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}
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}
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bool IsAcquired() const
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{
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return isAcquired_;
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}
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};
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};
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}
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