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/* -*- C++ -*-
This file is part of ThreadWeaver. It implements the Thread 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: Thread.cpp 25 2005-08-14 12:41:38Z mirko $
*/
#include "thread.h"
#include <QMutex>
#include <QDebug>
#include <QPointer>
#include <QCoreApplication>
#include "threadweaver.h"
#include "weaver.h"
#include "job.h"
#include "debuggingaids.h"
#include "exception.h"
using namespace ThreadWeaver;
class Q_DECL_HIDDEN Thread::Private
{
public:
explicit Private(Weaver *theParent)
: parent(theParent)
, id(makeId())
, job(nullptr)
{
Q_ASSERT(parent);
}
Weaver *parent;
const unsigned int id;
JobPointer job;
QMutex mutex;
static unsigned int makeId()
{
static QAtomicInt s_id(1);
return s_id.fetchAndAddRelease(1);
}
};
Thread::Thread(Weaver *parent)
: QThread() // no parent, because the QObject hierarchy of this thread
// does not have a parent (see QObject::pushToThread)
, d(new Private(parent))
{
const QString queueName = parent->objectName().isEmpty()
? QString::fromLatin1("Queue(0x%1)").arg(quintptr(parent), 0, 16, QChar::fromLatin1('0'))
: parent->objectName();
setObjectName(QString::fromLatin1("%1[%2]").arg(queueName).arg(QString::number(id()), 2, QChar::fromLatin1('0')));
}
Thread::~Thread()
{
delete d;
}
unsigned int Thread::id() const
{
return d->id; //id is const
}
void Thread::run()
{
Q_ASSERT(d->parent);
Q_ASSERT(QCoreApplication::instance() != nullptr);
d->parent->threadEnteredRun(this);
emit started(this);
TWDEBUG(3, "Thread::run [%u]: running.\n", id());
bool wasBusy = false;
while (true) {
TWDEBUG(3, "Thread::run [%u]: trying to execute the next job.\n", id());
try {
// the assignment is intentional: newJob needs to go out of scope at the end of the if statement
if (JobPointer newJob = d->parent->applyForWork(this, wasBusy)) {
QMutexLocker l(&d->mutex); Q_UNUSED(l);
d->job = newJob;
} else {
break;
}
} catch (AbortThread&) {
break;
}
wasBusy = true;
d->job->execute(d->job, this);
JobPointer oldJob;
{ // When finally destroying the last reference to d->job, do not hold the mutex.
// It may trigger destruction of the job, which can execute arbitrary code.
QMutexLocker l(&d->mutex); Q_UNUSED(l);
oldJob = d->job;
d->job.clear();
}
oldJob.clear();
}
TWDEBUG(3, "Thread::run [%u]: exiting.\n", id());
}
void Thread::requestAbort()
{
QMutexLocker l(&d->mutex); Q_UNUSED(l);
if (d->job) {
d->job->requestAbort();
}
}
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