icinga2/lib/base/threadpool.h

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/******************************************************************************
* Icinga 2 *
* Copyright (C) 2012-2014 Icinga Development Team (http://www.icinga.org) *
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* *
* 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 2 *
* of the License, or (at your option) any later version. *
* *
* 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, write to the Free Software Foundation *
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
******************************************************************************/
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#ifndef THREADPOOL_H
#define THREADPOOL_H
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#include "base/i2-base.h"
#include <stack>
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#include <boost/function.hpp>
#include <boost/thread/thread.hpp>
#include <boost/thread/mutex.hpp>
#include <boost/thread/condition_variable.hpp>
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namespace icinga
{
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/**
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* A thread pool.
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*
* @ingroup base
*/
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class I2_BASE_API ThreadPool
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{
public:
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typedef boost::function<void ()> WorkFunction;
ThreadPool(int max_threads = -1);
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~ThreadPool(void);
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void Start(void);
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void Stop(void);
void Join(bool wait_for_stop = false);
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bool Post(const WorkFunction& callback);
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private:
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enum ThreadState
{
ThreadUnspecified,
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ThreadDead,
ThreadIdle,
ThreadBusy
};
struct WorkItem
{
WorkFunction Callback;
double Timestamp;
};
struct Queue;
struct WorkerThread
{
ThreadState State;
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bool Zombie;
double Utilization;
double LastUpdate;
boost::thread *Thread;
WorkerThread(ThreadState state = ThreadDead)
: State(state), Zombie(false), Utilization(0), LastUpdate(0), Thread(NULL)
{ }
void UpdateUtilization(ThreadState state = ThreadUnspecified);
void ThreadProc(Queue& queue);
};
struct Queue
{
boost::mutex Mutex;
boost::condition_variable CV;
boost::condition_variable CVStarved;
std::deque<WorkItem> Items;
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double WaitTime;
double ServiceTime;
int TaskCount;
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bool Stopped;
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WorkerThread Threads[16];
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Queue(void)
: WaitTime(0), ServiceTime(0), TaskCount(0), Stopped(false)
{ }
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void SpawnWorker(boost::thread_group& group);
void KillWorker(boost::thread_group& group);
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};
int m_ID;
static int m_NextID;
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int m_MaxThreads;
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boost::thread_group m_ThreadGroup;
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boost::mutex m_MgmtMutex;
boost::condition_variable m_MgmtCV;
bool m_Stopped;
Queue m_Queues[4];
void ManagerThreadProc(void);
void StatsThreadProc(void);
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};
}
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#endif /* EVENTQUEUE_H */