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QMetaObject: Compare threadIds when checking receiver thread

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Comparing threadIds is faster, especially if invoked from a non qt thread,
where QThread::currentThread() needs to create a QAdoptedThread/QThreadData first.

Pick-to: 5.15
Change-Id: I44b3013283754f1a5ac9d62debcf4c82be77c554
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This commit is contained in:
Mike Achtelik 2020-06-15 10:08:14 +02:00
parent cb1c66bd20
commit 907027ab80
1 changed files with 16 additions and 9 deletions
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25
src/corelib/kernel/qmetaobject.cpp
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@ -56,6 +56,7 @@
#include "private/qobject_p.h"
#include "private/qmetaobject_p.h"
#include "private/qthread_p.h"
// for normalizeTypeInternal
#include "private/qmetaobject_moc_p.h"
@ -1467,10 +1468,14 @@ bool QMetaObject::invokeMethodImpl(QObject *object, QtPrivate::QSlotObjectBase *
if (! object)
return false;
QThread *currentThread = QThread::currentThread();
Qt::HANDLE currentThreadId = QThread::currentThreadId();
QThread *objectThread = object->thread();
bool receiverInSameThread = false;
if (objectThread)
receiverInSameThread = currentThreadId == QThreadData::get2(objectThread)->threadId.loadRelaxed();
if (type == Qt::AutoConnection)
type = (currentThread == objectThread) ? Qt::DirectConnection : Qt::QueuedConnection;
type = receiverInSameThread ? Qt::DirectConnection : Qt::QueuedConnection;
void *argv[] = { ret };
@ -1486,7 +1491,7 @@ bool QMetaObject::invokeMethodImpl(QObject *object, QtPrivate::QSlotObjectBase *
QCoreApplication::postEvent(object, new QMetaCallEvent(slot, nullptr, -1, 1));
} else if (type == Qt::BlockingQueuedConnection) {
#if QT_CONFIG(thread)
if (currentThread == objectThread)
if (receiverInSameThread)
qWarning("QMetaObject::invokeMethod: Dead lock detected");
QSemaphore semaphore;
@ -2253,11 +2258,15 @@ bool QMetaMethod::invoke(QObject *object,
if (paramCount <= QMetaMethodPrivate::get(this)->parameterCount())
return false;
Qt::HANDLE currentThreadId = QThread::currentThreadId();
QThread *objectThread = object->thread();
bool receiverInSameThread = false;
if (objectThread)
receiverInSameThread = currentThreadId == QThreadData::get2(objectThread)->threadId.loadRelaxed();
// check connection type
if (connectionType == Qt::AutoConnection) {
QThread *currentThread = QThread::currentThread();
QThread *objectThread = object->thread();
connectionType = currentThread == objectThread
connectionType = receiverInSameThread
? Qt::DirectConnection
: Qt::QueuedConnection;
}
@ -2328,9 +2337,7 @@ bool QMetaMethod::invoke(QObject *object,
QCoreApplication::postEvent(object, event.take());
} else { // blocking queued connection
#if QT_CONFIG(thread)
QThread *currentThread = QThread::currentThread();
QThread *objectThread = object->thread();
if (currentThread == objectThread) {
if (receiverInSameThread) {
qWarning("QMetaMethod::invoke: Dead lock detected in "
"BlockingQueuedConnection: Receiver is %s(%p)",
mobj->className(), object);