File indexing completed on 2024-04-21 04:01:28

 /* -*- C++ -*-
     This file is part of ThreadWeaver. It implements the Thread class.
 
     SPDX-FileCopyrightText: 2004-2013 Mirko Boehm <mirko@kde.org>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 
     $Id: Thread.cpp 25 2005-08-14 12:41:38Z mirko $
 */
 
 #include "thread.h"
 
 #include <QCoreApplication>
 #include <QDebug>
 #include <QPointer>
 
 #include "debuggingaids.h"
 #include "exception.h"
 #include "job.h"
 #include "threadweaver.h"
 #include "weaver.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);
 
     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();
     }
 }
 
 #include "moc_thread.cpp"