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ThreadWeaver

ResourceRestrictionPolicy.cpp

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00001 /* -*- C++ -*-
00002 
00003    This file implements the ResourceRestrictionPolicy class.
00004 
00005    $ Author: Mirko Boehm $
00006    $ Copyright: (C) 2004, 2005 Mirko Boehm $
00007    $ Contact: mirko@kde.org
00008          http://www.kde.org
00009          http://www.hackerbuero.org $
00010 
00011    This library is free software; you can redistribute it and/or
00012    modify it under the terms of the GNU Library General Public
00013    License as published by the Free Software Foundation; either
00014    version 2 of the License, or (at your option) any later version.
00015 
00016    This library is distributed in the hope that it will be useful,
00017    but WITHOUT ANY WARRANTY; without even the implied warranty of
00018    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00019    Library General Public License for more details.
00020 
00021    You should have received a copy of the GNU Library General Public License
00022    along with this library; see the file COPYING.LIB.  If not, write to
00023    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00024    Boston, MA 02110-1301, USA.
00025 
00026    $Id: Job.h 32 2005-08-17 08:38:01Z mirko $
00027 */
00028 
00029 #include "ResourceRestrictionPolicy.h"
00030 
00031 #include <QtCore/QList>
00032 #include <QtCore/QMutex>
00033 
00034 #include "DebuggingAids.h"
00035 
00036 using namespace ThreadWeaver;
00037 
00038 class ResourceRestrictionPolicy::Private
00039 {
00040 public:
00041     Private ( int theCap )
00042         : cap ( theCap)
00043     {}
00044 
00045     int cap;
00046     QList<Job*> customers;
00047     QMutex mutex;
00048 };
00049 
00050 ResourceRestrictionPolicy::ResourceRestrictionPolicy ( int cap)
00051     : QueuePolicy ()
00052     , d (new Private (cap))
00053 {
00054 }
00055 
00056 ResourceRestrictionPolicy::~ResourceRestrictionPolicy()
00057 {
00058     delete d;
00059 }
00060 
00061 void ResourceRestrictionPolicy::setCap (int cap)
00062 {
00063     QMutexLocker l ( & d->mutex );
00064     d->cap = cap;
00065 }
00066 
00067 int ResourceRestrictionPolicy::cap() const
00068 {
00069     QMutexLocker l ( & d->mutex );
00070     return d->cap;
00071 }
00072 
00073 bool ResourceRestrictionPolicy::canRun( Job* job )
00074 {
00075     QMutexLocker l ( & d->mutex );
00076     if ( d->customers.size() < d->cap )
00077     {
00078         d->customers.append( job );
00079         return true;
00080     } else {
00081         return false;
00082     }
00083 }
00084 
00085 void ResourceRestrictionPolicy::free ( Job* job )
00086 {
00087     QMutexLocker l ( & d->mutex );
00088     int position = d->customers.indexOf (job);
00089 
00090     if (position != -1)
00091     {
00092         debug ( 4, "ResourceRestrictionPolicy::free: job %p done.\n", (void*)job );
00093         d->customers.removeAt (position);
00094     }
00095 }
00096 
00097 void ResourceRestrictionPolicy::release ( Job* job )
00098 {
00099     free (job);
00100 }
00101 
00102 void ResourceRestrictionPolicy::destructed ( Job* job )
00103 {
00104     free (job);
00105 }

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