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/**
* Orthanc - A Lightweight, RESTful DICOM Store
* Copyright (C) 2012-2014 Medical Physics Department, CHU of Liege,
* Belgium
*
* 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 3 of the
* License, or (at your option) any later version.
*
* In addition, as a special exception, the copyright holders of this
* program give permission to link the code of its release with the
* OpenSSL project's "OpenSSL" library (or with modified versions of it
* that use the same license as the "OpenSSL" library), and distribute
* the linked executables. You must obey the GNU General Public License
* in all respects for all of the code used other than "OpenSSL". If you
* modify file(s) with this exception, you may extend this exception to
* your version of the file(s), but you are not obligated to do so. If
* you do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source files
* in the program, then also delete it here.
*
* 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, see <http://www.gnu.org/licenses/>.
**/
#include "../PrecompiledHeaders.h"
#include "BagOfRunnablesBySteps.h"
#include <stack>
#include <boost/thread.hpp>
namespace Orthanc
{
struct BagOfRunnablesBySteps::PImpl
{
bool continue_;
bool stopFinishListener_;
boost::mutex mutex_;
boost::condition_variable oneThreadIsStopped_;
boost::condition_variable oneThreadIsJoined_;
// The list of threads that are waiting to be joined.
typedef std::stack<IRunnableBySteps*> StoppedThreads;
StoppedThreads stoppedThreads_;
// The set of active runnables, i.e. the runnables that have not
// finished their job yet, plus the runnables that have not been
// joined yet.
typedef std::map<IRunnableBySteps*, boost::thread*> ActiveThreads;
ActiveThreads activeThreads_;
// The thread that joins the runnables after they stop
std::auto_ptr<boost::thread> finishListener_;
};
void BagOfRunnablesBySteps::RunnableThread(BagOfRunnablesBySteps* bag,
IRunnableBySteps* runnable)
{
while (bag->pimpl_->continue_)
{
if (!runnable->Step())
{
break;
}
}
{
// Register this runnable as having stopped
boost::mutex::scoped_lock lock(bag->pimpl_->mutex_);
bag->pimpl_->stoppedThreads_.push(runnable);
bag->pimpl_->oneThreadIsStopped_.notify_one();
}
}
void BagOfRunnablesBySteps::FinishListener(BagOfRunnablesBySteps* bag)
{
boost::mutex::scoped_lock lock(bag->pimpl_->mutex_);
while (!bag->pimpl_->stopFinishListener_)
{
while (!bag->pimpl_->stoppedThreads_.empty())
{
std::auto_ptr<IRunnableBySteps> r(bag->pimpl_->stoppedThreads_.top());
bag->pimpl_->stoppedThreads_.pop();
assert(r.get() != NULL);
assert(bag->pimpl_->activeThreads_.find(r.get()) != bag->pimpl_->activeThreads_.end());
std::auto_ptr<boost::thread> t(bag->pimpl_->activeThreads_[r.get()]);
bag->pimpl_->activeThreads_.erase(r.get());
assert(t.get() != NULL);
assert(bag->pimpl_->activeThreads_.find(r.get()) == bag->pimpl_->activeThreads_.end());
if (t->joinable())
{
t->join();
}
bag->pimpl_->oneThreadIsJoined_.notify_one();
}
bag->pimpl_->oneThreadIsStopped_.wait(lock);
}
}
BagOfRunnablesBySteps::BagOfRunnablesBySteps() : pimpl_(new PImpl)
{
pimpl_->continue_ = true;
pimpl_->stopFinishListener_ = false;
// Everyting is set up, the finish listener can be started
pimpl_->finishListener_.reset(new boost::thread(FinishListener, this));
}
BagOfRunnablesBySteps::~BagOfRunnablesBySteps()
{
StopAll();
// Stop the finish listener
pimpl_->stopFinishListener_ = true;
pimpl_->oneThreadIsStopped_.notify_one(); // Awakens the listener
if (pimpl_->finishListener_->joinable())
{
pimpl_->finishListener_->join();
}
}
void BagOfRunnablesBySteps::Add(IRunnableBySteps* runnable)
{
// Make sure the runnable is deleted is something goes wrong
std::auto_ptr<IRunnableBySteps> runnableRabi(runnable);
boost::mutex::scoped_lock lock(pimpl_->mutex_);
boost::thread* t(new boost::thread(RunnableThread, this, runnable));
pimpl_->activeThreads_.insert(std::make_pair(runnableRabi.release(), t));
}
void BagOfRunnablesBySteps::StopAll()
{
boost::mutex::scoped_lock lock(pimpl_->mutex_);
pimpl_->continue_ = false;
while (pimpl_->activeThreads_.size() > 0)
{
pimpl_->oneThreadIsJoined_.wait(lock);
}
pimpl_->continue_ = true;
}
}
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