icinga2/lib/base/workqueue.cpp

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/******************************************************************************
* Icinga 2 *
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* Copyright (C) 2012-2013 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. *
******************************************************************************/
#include "base/workqueue.h"
#include "base/utility.h"
#include <boost/bind.hpp>
using namespace icinga;
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WorkQueue::WorkQueue(size_t maxItems)
: m_MaxItems(maxItems), m_Executing(false)
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{ }
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WorkQueue::~WorkQueue(void)
{
Join();
}
/**
* Enqueues a work item. Work items are guaranteed to be executed in the order
* they were enqueued in.
*/
void WorkQueue::Enqueue(const WorkCallback& item)
{
boost::mutex::scoped_lock lock(m_Mutex);
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while (m_Items.size() >= m_MaxItems)
m_CV.wait(lock);
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m_Items.push_back(item);
m_CV.notify_all();
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if (!m_Executing) {
m_Executing = true;
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Utility::QueueAsyncCallback(boost::bind(&WorkQueue::ExecuteItem, this));
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}
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}
void WorkQueue::Join(void)
{
boost::mutex::scoped_lock lock(m_Mutex);
while (m_Executing || !m_Items.empty())
m_CV.wait(lock);
}
void WorkQueue::Clear(void)
{
boost::mutex::scoped_lock lock(m_Mutex);
m_Items.clear();
m_CV.notify_all();
}
void WorkQueue::ExecuteItem(void)
{
boost::mutex::scoped_lock lock(m_Mutex);
while (!m_Items.empty()) {
try {
WorkCallback wi = m_Items.front();
m_Items.pop_front();
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m_CV.notify_all();
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lock.unlock();
wi();
lock.lock();
} catch (...) {
lock.lock();
m_Executing = false;
throw;
}
}
m_Executing = false;
}