mirror of
https://github.com/Icinga/icinga2.git
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288 lines
6.9 KiB
C++
288 lines
6.9 KiB
C++
/******************************************************************************
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* Icinga 2 *
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* Copyright (C) 2012-2017 Icinga Development Team (https://www.icinga.com/) *
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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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#include "base/timer.hpp"
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#include "base/debug.hpp"
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#include "base/utility.hpp"
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#include <boost/bind.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 <boost/multi_index_container.hpp>
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#include <boost/multi_index/ordered_index.hpp>
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#include <boost/multi_index/key_extractors.hpp>
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using namespace icinga;
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typedef boost::multi_index_container<
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Timer::Holder,
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boost::multi_index::indexed_by<
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boost::multi_index::ordered_unique<boost::multi_index::const_mem_fun<Timer::Holder, Timer *, &Timer::Holder::GetObject> >,
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boost::multi_index::ordered_non_unique<boost::multi_index::const_mem_fun<Timer::Holder, double, &Timer::Holder::GetNextUnlocked> >
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>
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> TimerSet;
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static boost::mutex l_TimerMutex;
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static boost::condition_variable l_TimerCV;
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static boost::thread l_TimerThread;
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static bool l_StopTimerThread;
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static TimerSet l_Timers;
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/**
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* Constructor for the Timer class.
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*/
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Timer::Timer(void)
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: m_Interval(0), m_Next(0), m_Started(false), m_Running(false)
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{ }
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/**
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* Destructor for the Timer class.
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*/
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Timer::~Timer(void)
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{
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Stop(true);
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}
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/**
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* Initializes the timer sub-system.
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*/
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void Timer::Initialize(void)
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{
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boost::mutex::scoped_lock lock(l_TimerMutex);
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l_StopTimerThread = false;
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l_TimerThread = boost::thread(&Timer::TimerThreadProc);
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}
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/**
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* Disables the timer sub-system.
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*/
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void Timer::Uninitialize(void)
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{
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{
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boost::mutex::scoped_lock lock(l_TimerMutex);
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l_StopTimerThread = true;
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l_TimerCV.notify_all();
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}
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if (l_TimerThread.joinable())
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l_TimerThread.join();
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}
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/**
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* Calls this timer.
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*/
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void Timer::Call(void)
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{
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try {
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OnTimerExpired(Timer::Ptr(this));
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} catch (...) {
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InternalReschedule(true);
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throw;
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}
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InternalReschedule(true);
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}
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/**
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* Sets the interval for this timer.
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*
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* @param interval The new interval.
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*/
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void Timer::SetInterval(double interval)
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{
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boost::mutex::scoped_lock lock(l_TimerMutex);
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m_Interval = interval;
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}
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/**
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* Retrieves the interval for this timer.
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*
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* @returns The interval.
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*/
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double Timer::GetInterval(void) const
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{
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boost::mutex::scoped_lock lock(l_TimerMutex);
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return m_Interval;
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}
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/**
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* Registers the timer and starts processing events for it.
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*/
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void Timer::Start(void)
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{
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{
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boost::mutex::scoped_lock lock(l_TimerMutex);
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m_Started = true;
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}
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InternalReschedule(false);
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}
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/**
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* Unregisters the timer and stops processing events for it.
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*/
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void Timer::Stop(bool wait)
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{
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if (l_StopTimerThread)
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return;
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boost::mutex::scoped_lock lock(l_TimerMutex);
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m_Started = false;
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l_Timers.erase(this);
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/* Notify the worker thread that we've disabled a timer. */
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l_TimerCV.notify_all();
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while (wait && m_Running)
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l_TimerCV.wait(lock);
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}
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void Timer::Reschedule(double next)
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{
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InternalReschedule(false, next);
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}
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/**
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* Reschedules this timer.
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*
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* @param completed Whether the timer has just completed its callback.
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* @param next The time when this timer should be called again. Use -1 to let
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* the timer figure out a suitable time based on the interval.
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*/
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void Timer::InternalReschedule(bool completed, double next)
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{
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boost::mutex::scoped_lock lock(l_TimerMutex);
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if (completed)
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m_Running = false;
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if (next < 0) {
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/* Don't schedule the next call if this is not a periodic timer. */
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if (m_Interval <= 0)
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return;
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next = Utility::GetTime() + m_Interval;
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}
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m_Next = next;
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if (m_Started && !m_Running) {
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/* Remove and re-add the timer to update the index. */
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l_Timers.erase(this);
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l_Timers.insert(this);
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/* Notify the worker that we've rescheduled a timer. */
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l_TimerCV.notify_all();
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}
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}
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/**
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* Retrieves when the timer is next due.
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*
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* @returns The timestamp.
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*/
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double Timer::GetNext(void) const
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{
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boost::mutex::scoped_lock lock(l_TimerMutex);
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return m_Next;
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}
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/**
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* Adjusts all timers by adding the specified amount of time to their
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* next scheduled timestamp.
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*
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* @param adjustment The adjustment.
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*/
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void Timer::AdjustTimers(double adjustment)
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{
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boost::mutex::scoped_lock lock(l_TimerMutex);
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double now = Utility::GetTime();
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typedef boost::multi_index::nth_index<TimerSet, 1>::type TimerView;
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TimerView& idx = boost::get<1>(l_Timers);
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std::vector<Timer *> timers;
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for (Timer *timer : idx) {
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if (std::fabs(now - (timer->m_Next + adjustment)) <
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std::fabs(now - timer->m_Next)) {
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timer->m_Next += adjustment;
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timers.push_back(timer);
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}
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}
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for (Timer *timer : timers) {
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l_Timers.erase(timer);
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l_Timers.insert(timer);
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}
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/* Notify the worker that we've rescheduled some timers. */
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l_TimerCV.notify_all();
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}
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/**
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* Worker thread proc for Timer objects.
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*/
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void Timer::TimerThreadProc(void)
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{
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Utility::SetThreadName("Timer Thread");
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for (;;) {
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boost::mutex::scoped_lock lock(l_TimerMutex);
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typedef boost::multi_index::nth_index<TimerSet, 1>::type NextTimerView;
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NextTimerView& idx = boost::get<1>(l_Timers);
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/* Wait until there is at least one timer. */
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while (idx.empty() && !l_StopTimerThread)
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l_TimerCV.wait(lock);
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if (l_StopTimerThread)
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break;
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auto it = idx.begin();
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Timer *timer = *it;
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double wait = timer->m_Next - Utility::GetTime();
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if (wait > 0.01) {
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/* Wait for the next timer. */
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l_TimerCV.timed_wait(lock, boost::posix_time::milliseconds(wait * 1000));
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continue;
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}
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Timer::Ptr ptimer = timer;
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/* Remove the timer from the list so it doesn't get called again
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* until the current call is completed. */
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l_Timers.erase(timer);
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timer->m_Running = true;
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lock.unlock();
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/* Asynchronously call the timer. */
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Utility::QueueAsyncCallback(boost::bind(&Timer::Call, ptimer));
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}
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}
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