ThreadPriority.h

/*
    Scan Tailor - Interactive post-processing tool for scanned pages.
    Copyright (C)  Joseph Artsimovich <joseph.artsimovich@gmail.com>

    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.

    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/>.
*/

#ifndef THREAD_PRIORITY_H_
#define THREAD_PRIORITY_H_

#include <QThread>
#include <QString>

class QSettings;

class ThreadPriority
{
	// Member-wise copying is OK.
public:
	enum Priority {
		Minimum,
		Idle = Minimum,
		Lowest,
		Low,
		Normal,
		Maximum = Normal
	};

	ThreadPriority(Priority prio) : m_prio(prio) {}

	void setValue(Priority prio) { m_prio = prio; }

	Priority value() const { return m_prio; }

	QThread::Priority toQThreadPriority() const;

	int toPosixNiceLevel() const;

	static ThreadPriority load(
		QSettings const& settings, QString const& key, Priority dflt = Normal);

	static ThreadPriority load(QString const& key, Priority dflt = Normal);

	void save(QSettings& settings, QString const& key);

	void save(QString const& key);
private:
	Priority m_prio;
};

#endif