kdelibs/threadweaver/Weaver/WorkingHardState.cpp

/* -*- C++ -*-

This file implements the WorkingHardState class.

$ Author: Mirko Boehm $
$ Copyright: (C) 2005-2013 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: WorkingHardState.cpp 30 2005-08-16 16:16:04Z mirko $
*/

#include "WorkingHardState.h"

#include <kdebug.h>

#include "Job.h"
#include "Thread.h"
#include "WeaverImpl.h"
#include "ThreadWeaver.h"


using namespace ThreadWeaver;

void WorkingHardState::activated()
{
    weaver()->assignJobs();
}

void WorkingHardState::suspend()
{
    weaver()->setState ( Suspending );
}

void WorkingHardState::resume()
{
}

Job* WorkingHardState::applyForWork(Thread *th,  Job* previous)
{   // beware: this code is executed in the applying thread!
    kDebug() << "thread" << th->id() << "applies for work in state" << weaver()->state().stateName();

    Job *next = weaver()->takeFirstAvailableJob(previous);
    if ( next ) {
        return next;
    } else {
        kDebug() << "no work for thread" << th->id() << ", blocking it.";
        weaver()->waitForAvailableJob( th );
        // this is no infinite recursion: the state may have changed
        // meanwhile, or jobs may have become available:
        return weaver()->applyForWork( th,  0 );
    }
}

void WorkingHardState::waitForAvailableJob ( Thread *th )
{
    weaver()->blockThreadUntilJobsAreBeingAssigned ( th );
}

StateId WorkingHardState::stateId() const
{
    return WorkingHard;
}