mirror of
https://github.com/Icinga/icinga2.git
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119 lines
2.2 KiB
C++
119 lines
2.2 KiB
C++
/* Icinga 2 | (c) 2012 Icinga GmbH | GPLv2+ */
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#ifndef IO_ENGINE_H
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#define IO_ENGINE_H
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#include "base/lazy-init.hpp"
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#include <atomic>
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#include <exception>
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#include <memory>
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#include <thread>
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#include <vector>
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#include <boost/asio/deadline_timer.hpp>
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#include <boost/asio/io_service.hpp>
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#include <boost/asio/spawn.hpp>
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namespace icinga
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{
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/**
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* Scope lock for CPU-bound work done in an I/O thread
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*
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* @ingroup base
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*/
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class CpuBoundWork
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{
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public:
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CpuBoundWork(boost::asio::yield_context yc);
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CpuBoundWork(const CpuBoundWork&) = delete;
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CpuBoundWork(CpuBoundWork&&) = delete;
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CpuBoundWork& operator=(const CpuBoundWork&) = delete;
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CpuBoundWork& operator=(CpuBoundWork&&) = delete;
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~CpuBoundWork();
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void Done();
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private:
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bool m_Done;
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};
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/**
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* Scope break for CPU-bound work done in an I/O thread
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*
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* @ingroup base
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*/
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class IoBoundWorkSlot
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{
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public:
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IoBoundWorkSlot(boost::asio::yield_context yc);
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IoBoundWorkSlot(const IoBoundWorkSlot&) = delete;
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IoBoundWorkSlot(IoBoundWorkSlot&&) = delete;
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IoBoundWorkSlot& operator=(const IoBoundWorkSlot&) = delete;
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IoBoundWorkSlot& operator=(IoBoundWorkSlot&&) = delete;
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~IoBoundWorkSlot();
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private:
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boost::asio::yield_context yc;
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};
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/**
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* Async I/O engine
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*
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* @ingroup base
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*/
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class IoEngine
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{
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friend CpuBoundWork;
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friend IoBoundWorkSlot;
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public:
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IoEngine(const IoEngine&) = delete;
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IoEngine(IoEngine&&) = delete;
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IoEngine& operator=(const IoEngine&) = delete;
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IoEngine& operator=(IoEngine&&) = delete;
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~IoEngine();
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static IoEngine& Get();
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boost::asio::io_service& GetIoService();
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private:
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IoEngine();
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void RunEventLoop();
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static LazyInit<std::unique_ptr<IoEngine>> m_Instance;
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boost::asio::io_service m_IoService;
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boost::asio::io_service::work m_KeepAlive;
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std::vector<std::thread> m_Threads;
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boost::asio::deadline_timer m_AlreadyExpiredTimer;
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std::atomic_int_fast32_t m_CpuBoundSemaphore;
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};
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class TerminateIoThread : public std::exception
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{
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};
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/**
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* Condition variable which doesn't block I/O threads
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*
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* @ingroup base
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*/
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class AsioConditionVariable
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{
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public:
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AsioConditionVariable(boost::asio::io_service& io, bool init = false);
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void Set();
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void Clear();
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void Wait(boost::asio::yield_context yc);
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private:
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boost::asio::deadline_timer m_Timer;
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};
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}
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#endif /* IO_ENGINE_H */
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