eliminate main thread store

fixes RCC runtime crash on NetBSD

Signed-off-by: Ivailo Monev <xakepa10@gmail.com>

Author: fluxer

src/core/kernel/qcoreapplication.cpp

@@ -169,13 +169,6 @@ struct QCoreApplicationData {
     ~QCoreApplicationData() {
 #ifndef QT_NO_LIBRARY
         delete app_libpaths;
-#endif
-#ifndef QT_NO_QOBJECT
-        // cleanup the QAdoptedThread created for the main() thread
-        if (QCoreApplicationPrivate::theMainThread) {
-            QThreadData *data = QThreadData::get2(QCoreApplicationPrivate::theMainThread);
-            data->deref(); // deletes the data and the adopted thread
-        }
 #endif
     }
 
@@ -200,10 +193,6 @@ QCoreApplicationPrivate::QCoreApplicationPrivate(int &aargc, char **aargv)
         argv = (char **)∅ // ouch! careful with QCoreApplication::argv()!
     }
     QCoreApplicationPrivate::is_app_closing = false;
-
-    // note: this call to QThread::currentThread() may end up setting theMainThread!
-    if (Q_UNLIKELY(QThread::currentThread() != theMainThread))
-        qWarning("WARNING: QApplication was not created in the main() thread.");
 }
 
 QCoreApplicationPrivate::~QCoreApplicationPrivate()
@@ -231,8 +220,6 @@ void QCoreApplicationPrivate::createEventDispatcher()
     eventDispatcher = new QEventDispatcherUNIX(q);
 }
 
-QThread *QCoreApplicationPrivate::theMainThread = Q_NULLPTR;
-
 #if !defined (QT_NO_DEBUG)
 void QCoreApplicationPrivate::checkReceiverThread(QObject *receiver)
 {

src/core/kernel/qcoreapplication_p.h

@@ -78,9 +78,6 @@ class Q_CORE_EXPORT QCoreApplicationPrivate : public QObjectPrivate
     virtual void createEventDispatcher();
     static void removePostedEvent(QEvent *);
 
-    static QThread *theMainThread;
-    static inline QThread *mainThread()
-        { Q_ASSERT(theMainThread != 0); return theMainThread; }
     static bool checkInstance(const char *method);
     static void sendPostedEvents(QObject *receiver, int event_type, QThreadData *data);
 

src/core/plugin/qfactoryloader.cpp

@@ -80,7 +80,6 @@ QFactoryLoader::QFactoryLoader(const char *iid,
                                Qt::CaseSensitivity cs)
     : QObject(*new QFactoryLoaderPrivate)
 {
-    moveToThread(QCoreApplicationPrivate::mainThread());
     Q_D(QFactoryLoader);
     d->iid = iid;
     d->cs = cs;
@@ -223,11 +222,7 @@ QObject *QFactoryLoader::instance(const QString &key) const
     QString lowered = d->cs ? key : key.toLower();
     if (QLibraryPrivate* library = d->keyMap.value(lowered)) {
         if (library->instance || library->loadPlugin()) {
-            if (QObject *obj = library->instance()) {
-                if (obj && !obj->parent())
-                    obj->moveToThread(QCoreApplicationPrivate::mainThread());
-                return obj;
-            }
+            return library->instance();
         }
     }
     return 0;

src/core/thread/qthread.cpp

@@ -61,17 +61,6 @@ QThreadData::~QThreadData()
 {
     Q_ASSERT(_ref == 0);
 
-    // In the odd case that Qt is running on a secondary thread, the main
-    // thread instance will have been dereffed asunder because of the deref in
-    // QThreadData::current() and the deref in the pthread_destroy. To avoid
-    // crashing during QCoreApplicationData's global static cleanup we need to
-    // safeguard the main thread here.. This fix is a bit crude, but it solves
-    // the problem...
-    if (this->thread == QCoreApplicationPrivate::theMainThread) {
-       QCoreApplicationPrivate::theMainThread = Q_NULLPTR;
-       QThreadData::clearCurrentThreadData();
-    }
-
     delete thread;
     thread = Q_NULLPTR;
 

src/core/thread/qthread_unix.cpp

@@ -148,8 +148,6 @@ QThreadData *QThreadData::current()
 
         data->isAdopted = true;
         data->threadId = (Qt::HANDLE)pthread_self();
-        if (!QCoreApplicationPrivate::theMainThread)
-            QCoreApplicationPrivate::theMainThread = data->thread;
     }
     return data;
 }

src/network/bearer/qnetworkconfigmanager.cpp

@@ -39,8 +39,6 @@
 #include <QtCore/qstringlist.h>
 #include <QtCore/qcoreapplication.h>
 #include <QtCore/qmutex.h>
-#include <QtCore/qthread.h>
-#include <QtCore/qcoreapplication_p.h>
 
 #ifndef QT_NO_BEARERMANAGEMENT
 
@@ -74,18 +72,8 @@ static QNetworkConfigurationManagerPrivate *connManager()
         if (!(ptr = connManager_ptr.fetchAndAddAcquire(0))) {
             ptr = new QNetworkConfigurationManagerPrivate;
 
-            if (QCoreApplicationPrivate::mainThread() == QThread::currentThread()) {
-                // right thread or no main thread yet
-                ptr->addPostRoutine();
-                ptr->initialize();
-            } else {
-                // wrong thread, we need to make the main thread do this
-                QObject *obj = new QObject;
-                QObject::connect(obj, SIGNAL(destroyed()), ptr, SLOT(addPostRoutine()), Qt::DirectConnection);
-                ptr->initialize(); // this moves us to the right thread
-                obj->moveToThread(QCoreApplicationPrivate::mainThread());
-                obj->deleteLater();
-            }
+            ptr->addPostRoutine();
+            ptr->initialize();
 
             connManager_ptr.fetchAndStoreRelease(ptr);
         }

src/network/bearer/qnetworkconfigmanager_p.cpp

@@ -33,13 +33,10 @@
 
 #include "qnetworkconfigmanager_p.h"
 #include "qbearerplugin_p.h"
-
 #include <QtCore/qfactoryloader_p.h>
-
 #include <QtCore/qdebug.h>
 #include <QtCore/qtimer.h>
 #include <QtCore/qstringlist.h>
-#include <QtCore/qcoreapplication_p.h>
 
 #ifndef QT_NO_BEARERMANAGEMENT
 
@@ -59,7 +56,6 @@ QNetworkConfigurationManagerPrivate::QNetworkConfigurationManagerPrivate()
 
 void QNetworkConfigurationManagerPrivate::initialize()
 {
-    moveToThread(QCoreApplicationPrivate::mainThread()); // because cleanup() is called in main thread context.
     updateConfigurations();
 }
 
@@ -366,8 +362,6 @@ void QNetworkConfigurationManagerPrivate::updateConfigurations()
                 else
                     sessionEngines.append(engine);
 
-                engine->moveToThread(QCoreApplicationPrivate::mainThread());
-
                 connect(engine, SIGNAL(updateCompleted()),
                         this, SLOT(updateConfigurations()),
                         Qt::QueuedConnection);