QThread: make finish() and cleanup() non-static members

Looks cleaner.

Change-Id: I77148a15c316ea0eaf63fffd9358d952c5b9e1d0
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
(cherry picked from commit f94c9b0f3a060fa98c270d5ccab3055e77ebc35f)
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

src/corelib/thread/qthread_p.h

@@ -202,13 +202,13 @@ public:
     QWaitCondition thread_done;
 
     static void *start(void *arg);
-    static void finish(void *);     // happens early (before thread-local dtors)
-    static void cleanup(void *);    // happens late (as a thread-local dtor, if possible)
+    void finish();          // happens early (before thread-local dtors)
+    void cleanup();         // happens late (as a thread-local dtor, if possible)
 #endif // Q_OS_UNIX
 
 #ifdef Q_OS_WIN
     static unsigned int __stdcall start(void *) noexcept;
-    static void finish(void *, bool lockAnyway = true) noexcept;
+    void finish(bool lockAnyway = true) noexcept;
 
     Qt::HANDLE handle;
     unsigned int id;

src/corelib/thread/qthread_unix.cpp

@@ -112,15 +112,15 @@ static void destroy_current_thread_data(void *p)
         // this is very likely the last reference. These pointers cannot be
         // null and there is no race.
         QThreadPrivate *thread_p = static_cast<QThreadPrivate *>(QObjectPrivate::get(thread));
-        thread_p->finish(thread);
+        thread_p->finish();
         if constexpr (!QT_CONFIG(broken_threadlocal_dtors))
-            thread_p->cleanup(thread);
+            thread_p->cleanup();
     } else if constexpr (!QT_CONFIG(broken_threadlocal_dtors)) {
         // We may be racing the QThread destructor in another thread. With
         // two-phase clean-up enabled, there's also no race because it will
         // stop in a call to QThread::wait() until we call cleanup().
         QThreadPrivate *thread_p = static_cast<QThreadPrivate *>(QObjectPrivate::get(thread));
-        thread_p->cleanup(thread);
+        thread_p->cleanup();
     } else {
         // We may be racing the QThread destructor in another thread and it may
         // have begun destruction; we must not dereference the QThread pointer.
@@ -314,7 +314,7 @@ void *QThreadPrivate::start(void *arg)
     // this ensures the thread-local is created as early as possible
     set_thread_data(data);
 
-    pthread_cleanup_push(QThreadPrivate::finish, arg);
+    pthread_cleanup_push([](void *arg) { static_cast<QThread *>(arg)->d_func()->finish(); }, arg);
     terminate_on_exception([&] {
         {
             QMutexLocker locker(&thr->d_func()->mutex);
@@ -361,11 +361,11 @@ void *QThreadPrivate::start(void *arg)
     return nullptr;
 }
 
-void QThreadPrivate::finish(void *arg)
+void QThreadPrivate::finish()
 {
     terminate_on_exception([&] {
-        QThread *thr = reinterpret_cast<QThread *>(arg);
-        QThreadPrivate *d = thr->d_func();
+        QThreadPrivate *d = this;
+        QThread *thr = q_func();
 
         // Disable cancellation; we're already in the finishing touches of this
         // thread, and we don't want cleanup to be disturbed by
@@ -388,14 +388,13 @@ void QThreadPrivate::finish(void *arg)
     });
 
     if constexpr (QT_CONFIG(broken_threadlocal_dtors))
-        cleanup(arg);
+        cleanup();
 }
 
-void QThreadPrivate::cleanup(void *arg)
+void QThreadPrivate::cleanup()
 {
     terminate_on_exception([&] {
-        QThread *thr = reinterpret_cast<QThread *>(arg);
-        QThreadPrivate *d = thr->d_func();
+        QThreadPrivate *d = this;
 
         // Disable cancellation again: we did it above, but some user code
         // running between finish() and cleanup() may have turned them back on.

src/corelib/thread/qthread_win.cpp

@@ -209,7 +209,7 @@ DWORD WINAPI qt_adopted_thread_watcher_function(LPVOID)
             auto thread_p = static_cast<QThreadPrivate *>(QObjectPrivate::get(thread));
             Q_UNUSED(thread_p);
             Q_ASSERT(!thread_p->finished);
-            QThreadPrivate::finish(thread);
+            thread_p->finish();
         }
         data->deref();
 
@@ -269,7 +269,7 @@ unsigned int __stdcall QT_ENSURE_STACK_ALIGNED_FOR_SSE QThreadPrivate::start(voi
     QThread::setTerminationEnabled(true);
     thr->run();
 
-    finish(arg);
+    thr->d_func()->finish();
     return 0;
 }
 
@@ -284,10 +284,10 @@ unsigned int __stdcall QT_ENSURE_STACK_ALIGNED_FOR_SSE QThreadPrivate::start(voi
 
     In those cases, \a arg will not be the current thread.
 */
-void QThreadPrivate::finish(void *arg, bool lockAnyway) noexcept
+void QThreadPrivate::finish(bool lockAnyway) noexcept
 {
-    QThread *thr = reinterpret_cast<QThread *>(arg);
-    QThreadPrivate *d = thr->d_func();
+    QThreadPrivate *d = this;
+    QThread *thr = q_func();
 
     QMutexLocker locker(lockAnyway ? &d->mutex : nullptr);
     d->isInFinish = true;
@@ -481,7 +481,7 @@ void QThread::terminate()
     }
 
     TerminateThread(d->handle, 0);
-    QThreadPrivate::finish(this, false);
+    d->finish(false);
 }
 
 bool QThread::wait(QDeadlineTimer deadline)
@@ -519,7 +519,7 @@ bool QThread::wait(QDeadlineTimer deadline)
     if (ret && !d->finished) {
         // thread was terminated by someone else
 
-        QThreadPrivate::finish(this, false);
+        d->finish(false);
     }
 
     if (d->finished && !d->waiters) {
@@ -539,7 +539,7 @@ void QThread::setTerminationEnabled(bool enabled)
     QMutexLocker locker(&d->mutex);
     d->terminationEnabled = enabled;
     if (enabled && d->terminatePending) {
-        QThreadPrivate::finish(thr, false);
+        d->finish(false);
         locker.unlock(); // don't leave the mutex locked!
         _endthreadex(0);
     }