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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL3$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPLv3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or later as published by the Free
** Software Foundation and appearing in the file LICENSE.GPL included in
** the packaging of this file. Please review the following information to
** ensure the GNU General Public License version 2.0 requirements will be
** met: http://www.gnu.org/licenses/gpl-2.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <iterator>
#include "dependencyhandler_p.h"
QT_BEGIN_NAMESPACE
namespace Qt3DCore {
namespace {
template <template <typename T> class Op>
struct ByDepender {
typedef bool result_type;
bool operator()(const RunnableInterface *lhs, const RunnableInterface *rhs) const Q_DECL_NOTHROW
{ return Op<const RunnableInterface *>()(lhs, rhs); }
bool operator()(const RunnableInterface *lhs, const Dependency &rhs) const Q_DECL_NOTHROW
{ return operator()(lhs, rhs.depender); }
bool operator()(const Dependency &lhs, const RunnableInterface *rhs) const Q_DECL_NOTHROW
{ return operator()(lhs.depender, rhs); }
bool operator()(const Dependency &lhs, const Dependency &rhs) const Q_DECL_NOTHROW
{ return operator()(lhs.depender, rhs.depender); }
};
struct DependeeEquals : std::unary_function<Dependency, bool>
{
const RunnableInterface *dependee;
QVector<RunnableInterface *> *freedList;
explicit DependeeEquals(const RunnableInterface *dependee, QVector<RunnableInterface *> *freedList)
: dependee(qMove(dependee)), freedList(qMove(freedList)) {}
bool operator()(const Dependency &candidate) const
{
if (dependee == candidate.dependee) {
if (!candidate.depender->reserved())
freedList->append(candidate.depender);
return true;
}
return false;
}
};
struct DependerEquals : std::unary_function<Dependency, bool>
{
const RunnableInterface *depender;
explicit DependerEquals(const RunnableInterface *depender)
: depender(qMove(depender)) {}
bool operator()(const Dependency &candidate) const
{
return depender == candidate.depender;
}
};
struct ByDependerThenDependee : std::binary_function<Dependency, Dependency, bool>
{
// Defines a lexicographical order (depender first).
bool operator()(const Dependency &lhs, const Dependency &rhs)
{
if (lhs.depender < rhs.depender) return true;
if (rhs.depender < lhs.depender) return false;
return lhs.dependee < rhs.dependee;
}
};
}
DependencyHandler::DependencyHandler()
{
}
void DependencyHandler::addDependencies(QVector<Dependency> dependencies)
{
std::sort(dependencies.begin(), dependencies.end(), ByDependerThenDependee());
const QMutexLocker locker(m_mutex);
QVector<Dependency> newDependencyMap;
newDependencyMap.reserve(dependencies.size() + m_dependencyMap.size());
std::set_union(m_dependencyMap.begin(), m_dependencyMap.end(),
dependencies.begin(), dependencies.end(),
std::back_inserter(newDependencyMap), ByDependerThenDependee());
m_dependencyMap.swap(newDependencyMap); // commit
}
bool DependencyHandler::hasDependency(const RunnableInterface *depender)
{
// The caller has to set the mutex, which is QThreadPooler::enqueueTasks
return std::binary_search(m_dependencyMap.begin(), m_dependencyMap.end(),
depender, ByDepender<std::less>());
}
/*
* Removes all the entries on the m_dependencyMap that have given task as a dependee,
* i.e. entries where the dependency is on the given task.
*/
QVector<RunnableInterface *> DependencyHandler::freeDependencies(const RunnableInterface *task)
{
// The caller has to set the mutex, which is QThreadPooler::taskFinished
m_dependencyMap.erase(std::remove_if(m_dependencyMap.begin(),
m_dependencyMap.end(),
DependerEquals(task)),
m_dependencyMap.end());
QVector<RunnableInterface *> freedList;
m_dependencyMap.erase(std::remove_if(m_dependencyMap.begin(),
m_dependencyMap.end(),
DependeeEquals(task, &freedList)),
m_dependencyMap.end());
return freedList;
}
} // namespace Qt3DCore
QT_END_NAMESPACE
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