QEventLoopLocker: rewrite to hold public classes

... instead of Private ones, at the cost of having to befriend of all
the lockable classes, because we need access to their d_func()'s.

This simplifies the code, because we don't need the manual QClass to
QClassPrivate mapping (o2p) anymore, we can just use d_func(). This also
paves the way to make QEventLoopLocker almost completely inline and use
a 3-pointer form of QBiPointer, once available, to hide the bit
fiddling. We couldn't make such a change if the class continued to hold
pointers to QClassPrivate's.

Pick-to: 6.6
Task-number: QTBUG-114793
Change-Id: Id300e4d45d6cacabe090a46cd6433c5ead3c8b0c
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/corelib/thread/qthread.h b/src/corelib/thread/qthread.h
index cea5aeb73c..40f363ee5a 100644
--- a/src/corelib/thread/qthread.h
+++ b/src/corelib/thread/qthread.h
@@ -24,6 +24,7 @@ QT_BEGIN_NAMESPACE
 class QThreadData;
 class QThreadPrivate;
 class QAbstractEventDispatcher;
+class QEventLoopLocker;
 
 class Q_CORE_EXPORT QThread : public QObject
 {
@@ -109,6 +110,7 @@ protected:
 
 private:
     Q_DECLARE_PRIVATE(QThread)
+    friend class QEventLoopLocker;
 
 #if QT_CONFIG(cxx11_future)
     [[nodiscard]] static QThread *createThreadImpl(std::future<void> &&future);