/usr/include/KF5/ThreadWeaver/threadweaver/resourcerestrictionpolicy.h is in libkf5threadweaver-dev 5.18.0-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 | /* -*- C++ -*-
This file declares the ResourceRestrictionPolicy class.
$ 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.
$Id: Job.h 32 2005-08-17 08:38:01Z mirko $
*/
#ifndef RESOURCE_RESTRICTION_POLICY_H
#define RESOURCE_RESTRICTION_POLICY_H
#include <QtGlobal>
#include "jobpointer.h"
#include "queuepolicy.h"
namespace ThreadWeaver
{
class JobInterface;
/** @brief ResourceRestrictionPolicy is used to limit the number of concurrent accesses to the same resource.
*
* If a set of Jobs accesses a resource that can be overloaded, this may degrade application performance. For
* example, loading too many files from the hard disc at the same time may lead to longer load times.
* ResourceRestrictionPolicy can be used to cap the number of accesses. Resource restriction policies are
* shared between the affected jobs. All jobs that share a resurce restriction policy have to acquire
* permission from the policy before they can run. In this way, resource restrictions can be compared to
* semaphores, only that they require no locking at the thread level.
* The example uses a resource restriction to limit the number of images files that are loaded from
* the disk at the same time.
*/
class THREADWEAVER_EXPORT ResourceRestrictionPolicy : public QueuePolicy
{
public:
explicit ResourceRestrictionPolicy(int cap = 0);
~ResourceRestrictionPolicy();
/** @brief Cap the number of simultaneously executing jobs.
* Capping the amount of jobs will make sure that at max the number of jobs executing at any time is
* limited to the capped amount. Note that immediately after setting the amount of running jobs may be
* higher than the set amount. This setting only limits the starting of new jobs.
* @param newCap the new cap to limit the amount of parallel jobs.
*/
void setCap(int newCap);
int cap() const;
bool canRun(JobPointer) Q_DECL_OVERRIDE;
void free(JobPointer) Q_DECL_OVERRIDE;
void release(JobPointer) Q_DECL_OVERRIDE;
void destructed(JobInterface *job) Q_DECL_OVERRIDE;
private:
class Private;
Private *const d;
};
}
#endif // RESOURCE_RESTRICTION_POLICY_H
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