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QThread: merge some Unix/Windows/no-thread code for QAdoptedThread

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It was duplicated in all three files. The remaining code is very
similar, but I don't think we want to merge it any further. For one
thing, we must set the thread-local variable before QAdoptedThread calls
the QObject constructor.

Change-Id: Iac9f7f7528085a1137d7fffdecf080a2b6e1aefe
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
This commit is contained in:
Thiago Macieira 2024-11-06 07:15:42 -08:00
parent d25ff2c7e2
commit f2b5c779cd
4 changed files with 17 additions and 29 deletions
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25
src/corelib/thread/qthread.cpp
View File

@ -13,6 +13,8 @@
QT_BEGIN_NAMESPACE
using namespace Qt::StringLiterals;
/*
QPostEventList
*/
@ -113,6 +115,20 @@ QAbstractEventDispatcher *QThreadData::createEventDispatcher()
QAdoptedThread::QAdoptedThread(QThreadData *data)
: QThread(*new QThreadPrivate(data))
{
// avoid a cyclic reference count: QThreadData owns this QAdoptedThread
// object but QObject's constructor increased the count
data->deref();
data->isAdopted = true;
Qt::HANDLE id = QThread::currentThreadId();
data->threadId.storeRelaxed(id);
if (!QCoreApplicationPrivate::theMainThreadId.loadAcquire()) {
// we are the main thread
QCoreApplicationPrivate::theMainThread.storeRelease(this);
QCoreApplicationPrivate::theMainThreadId.storeRelaxed(id);
setObjectName(u"Qt mainThread"_s);
}
// thread should be running and not finished for the lifetime
// of the application (even if QCoreApplication goes away)
#if QT_CONFIG(thread)
@ -1130,15 +1146,6 @@ QThreadData *QThreadData::current(bool createIfNecessary)
if (!data && createIfNecessary) {
data = new QThreadData;
data->thread = new QAdoptedThread(data);
data->threadId.storeRelaxed(Qt::HANDLE(data->thread.loadAcquire()));
data->deref();
data->isAdopted = true;
if (!QCoreApplicationPrivate::theMainThreadId.loadAcquire()) {
auto *mainThread = data->thread.loadRelaxed();
mainThread->setObjectName("Qt mainThread");
QCoreApplicationPrivate::theMainThread.storeRelease(mainThread);
QCoreApplicationPrivate::theMainThreadId.storeRelaxed(data->threadId.loadRelaxed());
}
}
return data;
}

2
src/corelib/thread/qthread_p.h
View File

@ -363,7 +363,7 @@ class QAdoptedThread : public QThread
Q_DECLARE_PRIVATE(QThread)
public:
QAdoptedThread(QThreadData *data = nullptr);
QAdoptedThread(QThreadData *data);
~QAdoptedThread();
void init();

9
src/corelib/thread/qthread_unix.cpp
View File

@ -245,15 +245,6 @@ QThreadData *QThreadData::current(bool createIfNecessary)
data = nullptr;
QT_RETHROW;
}
data->deref();
data->isAdopted = true;
data->threadId.storeRelaxed(QThread::currentThreadId());
if (!QCoreApplicationPrivate::theMainThreadId.loadAcquire()) {
auto *mainThread = data->thread.loadRelaxed();
mainThread->setObjectName("Qt mainThread");
QCoreApplicationPrivate::theMainThread.storeRelease(mainThread);
QCoreApplicationPrivate::theMainThreadId.storeRelaxed(data->threadId.loadRelaxed());
}
}
return data;
}

10
src/corelib/thread/qthread_win.cpp
View File

@ -107,16 +107,6 @@ QThreadData *QThreadData::current(bool createIfNecessary)
threadData = 0;
QT_RETHROW;
}
threadData->deref();
threadData->isAdopted = true;
threadData->threadId.storeRelaxed(reinterpret_cast<Qt::HANDLE>(quintptr(GetCurrentThreadId())));
if (!QCoreApplicationPrivate::theMainThreadId) {
auto *mainThread = threadData->thread.loadRelaxed();
mainThread->setObjectName("Qt mainThread");
QCoreApplicationPrivate::theMainThread.storeRelease(mainThread);
QCoreApplicationPrivate::theMainThreadId.storeRelaxed(threadData->threadId.loadRelaxed());
}
}
return threadData;
}