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/* -*- C++ -*-
This file is part of ThreadWeaver.
$ Author: Mirko Boehm $
$ Copyright: (C) 2004-2013 Mirko Boehm $
$ Contact: mirko@kde.org
http://www.kde.org
http://creative-destruction.me $
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "sequence_p.h"
#include "debuggingaids.h"
namespace ThreadWeaver {
namespace Private {
Sequence_Private::Sequence_Private()
{
}
BlockerPolicy *Sequence_Private::blocker()
{
return &blocker_;
}
void Sequence_Private::prepareToEnqueueElements()
{
Q_ASSERT(!mutex.tryLock());
const int jobs = elements.count();
// probably incorrect:
completed_.storeRelease(0);
// block the execution of the later jobs:
for (int i = 0; i < jobs; ++i) {
TWDEBUG(4, "Sequence_Private::processCompletedElement: blocking %p\n", elements.at(i).data());
JobPointer nextJob = elements.at(i);
QMutexLocker l(nextJob->mutex());
nextJob->assignQueuePolicy(blocker());
}
}
void Sequence_Private::processCompletedElement(Collection* collection, JobPointer job, Thread*)
{
Q_ASSERT(!mutex.tryLock());
Q_ASSERT(job != nullptr);
Q_ASSERT(!self.isNull());
const JobInterface::Status status = job->status();
if (status != JobInterface::Status_Success) {
stop_locked(collection);
collection->setStatus(status);
}
const int next = completed_.fetchAndAddAcquire(1);
const int count = elements.count();
if (count > 0) {
if (next < count) {
TWDEBUG(4, "Sequence_Private::processCompletedElement: unblocking %p\n", elements.at(next).data());
JobPointer nextJob = elements.at(next);
QMutexLocker l(nextJob->mutex());
nextJob->removeQueuePolicy(blocker());
}
}
}
void Sequence_Private::elementDequeued(const JobPointer &job)
{
Q_ASSERT(!mutex.tryLock());
QMutexLocker l(job->mutex());
job->removeQueuePolicy(blocker());
}
void BlockerPolicy::destructed(JobInterface*)
{
}
bool BlockerPolicy::canRun(JobPointer)
{
return false;
}
void BlockerPolicy::free(JobPointer)
{
}
void BlockerPolicy::release(JobPointer)
{
}
}
}
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