mirror of
https://github.com/Icinga/icinga2.git
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137 lines
3.3 KiB
C++
137 lines
3.3 KiB
C++
/******************************************************************************
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* Icinga 2 *
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* Copyright (C) 2012-2015 Icinga Development Team (http://www.icinga.org) *
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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 General Public License *
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* as published by the Free Software Foundation; either version 2 *
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* of 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, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the Free Software Foundation *
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
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******************************************************************************/
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#ifndef THREADPOOL_H
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#define THREADPOOL_H
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#include "base/i2-base.hpp"
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#include <boost/function.hpp>
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#include <boost/thread/thread.hpp>
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#include <boost/thread/mutex.hpp>
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#include <boost/thread/condition_variable.hpp>
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#include <deque>
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namespace icinga
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{
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#define QUEUECOUNT 4U
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enum SchedulerPolicy
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{
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DefaultScheduler,
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LowLatencyScheduler
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};
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/**
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* A thread pool.
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*
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* @ingroup base
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*/
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class I2_BASE_API ThreadPool
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{
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public:
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typedef boost::function<void ()> WorkFunction;
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ThreadPool(size_t max_threads = UINT_MAX);
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~ThreadPool(void);
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void Start(void);
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void Stop(void);
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bool Post(const WorkFunction& callback, SchedulerPolicy policy = DefaultScheduler);
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private:
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enum ThreadState
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{
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ThreadUnspecified,
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ThreadDead,
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ThreadIdle,
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ThreadBusy
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};
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struct WorkItem
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{
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WorkFunction Callback;
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double Timestamp;
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};
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struct Queue;
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struct WorkerThread
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{
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ThreadState State;
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bool Zombie;
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double Utilization;
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double LastUpdate;
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boost::thread *Thread;
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WorkerThread(ThreadState state = ThreadDead)
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: State(state), Zombie(false), Utilization(0), LastUpdate(0), Thread(NULL)
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{ }
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void UpdateUtilization(ThreadState state = ThreadUnspecified);
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void ThreadProc(Queue& queue);
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};
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struct Queue
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{
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boost::mutex Mutex;
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boost::condition_variable CV;
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boost::condition_variable CVStarved;
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std::deque<WorkItem> Items;
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double WaitTime;
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double ServiceTime;
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int TaskCount;
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bool Stopped;
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WorkerThread Threads[16];
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Queue(void)
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: WaitTime(0), ServiceTime(0), TaskCount(0), Stopped(false)
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{ }
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void SpawnWorker(boost::thread_group& group);
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void KillWorker(boost::thread_group& group);
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};
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int m_ID;
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static int m_NextID;
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size_t m_MaxThreads;
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boost::thread_group m_ThreadGroup;
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boost::thread m_MgmtThread;
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boost::mutex m_MgmtMutex;
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boost::condition_variable m_MgmtCV;
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bool m_Stopped;
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Queue m_Queues[QUEUECOUNT];
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void ManagerThreadProc(void);
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};
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}
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#endif /* EVENTQUEUE_H */
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