From 55b974faa158a36cb0ab39fd9cfd11b2f6c186ba Mon Sep 17 00:00:00 2001 From: Olivier Goffart Date: Tue, 29 Nov 2011 01:44:18 +0100 Subject: [PATCH] Fix Qt::QueuedConnection when signal has a return value For queued connections, the args[0] is set to null as it make no sens to forward the return value to the signal. So we need to check in the operator, that the pointer is not null. (container.data is args[0]) Change-Id: I80bde66f1ec19de0f4962c80e5b2797d2819075c Reviewed-by: Bradley T. Hughes --- src/corelib/kernel/qobject_impl.h | 6 +- .../corelib/kernel/qobject/tst_qobject.cpp | 57 +++++++++++++++++++ 2 files changed, 61 insertions(+), 2 deletions(-) diff --git a/src/corelib/kernel/qobject_impl.h b/src/corelib/kernel/qobject_impl.h index 9918b1f1c2e..d34b81ceaf8 100644 --- a/src/corelib/kernel/qobject_impl.h +++ b/src/corelib/kernel/qobject_impl.h @@ -96,12 +96,14 @@ namespace QtPrivate { }; template void operator,(const T &value, const ApplyReturnValue &container) { - *reinterpret_cast(container.data) = value; + if (container.data) + *reinterpret_cast(container.data) = value; } #ifdef Q_COMPILER_RVALUE_REFS template void operator,(T &&value, const ApplyReturnValue &container) { - *reinterpret_cast(container.data) = value; + if (container.data) + *reinterpret_cast(container.data) = value; } #endif template diff --git a/tests/auto/corelib/kernel/qobject/tst_qobject.cpp b/tests/auto/corelib/kernel/qobject/tst_qobject.cpp index 5e69a14ba81..511eb73d9dc 100644 --- a/tests/auto/corelib/kernel/qobject/tst_qobject.cpp +++ b/tests/auto/corelib/kernel/qobject/tst_qobject.cpp @@ -4978,6 +4978,29 @@ void tst_QObject::returnValue() QVERIFY(connect(&r, &ReturnValue::returnCustomType, &receiver, &ReturnValue::returnVoidSlot, type)); QCOMPARE((emit r.returnCustomType(45)).value(), CustomType().value()); } + if (!isBlockingQueued) { + // queued connection should not forward the return value + CheckInstanceCount checker; + ReturnValue r; + QVERIFY(connect(&r, &ReturnValue::returnVariant, &receiver, &ReturnValue::returnVariantSlot, Qt::QueuedConnection)); + QCOMPARE(emit r.returnVariant(45), QVariant()); + QVERIFY(connect(&r, &ReturnValue::returnString, &receiver, &ReturnValue::returnStringSlot, Qt::QueuedConnection)); + QCOMPARE(emit r.returnString(45), QString()); + QVERIFY(connect(&r, &ReturnValue::returnInt, &receiver, &ReturnValue::returnIntSlot, Qt::QueuedConnection)); + QCOMPARE(emit r.returnInt(45), int()); + QVERIFY(connect(&r, &ReturnValue::returnCustomType, &receiver, &ReturnValue::returnCustomTypeSlot, Qt::QueuedConnection)); + QCOMPARE((emit r.returnCustomType(45)).value(), CustomType().value()); + QCoreApplication::processEvents(); + + QVERIFY(connect(&r, &ReturnValue::returnVariant, &receiver, &ReturnValue::returnStringSlot, Qt::QueuedConnection)); + QCOMPARE(emit r.returnVariant(48), QVariant()); + QVERIFY(connect(&r, &ReturnValue::returnCustomType, &receiver, &ReturnValue::returnIntSlot, Qt::QueuedConnection)); + QCOMPARE((emit r.returnCustomType(48)).value(), CustomType().value()); + QVERIFY(connect(&r, &ReturnValue::returnVoid, &receiver, &ReturnValue::returnCustomTypeSlot, Qt::QueuedConnection)); + emit r.returnVoid(48); + QCoreApplication::processEvents(); + } + { // connected to many slots ReturnValue::VoidFunctor voidFunctor; ReturnValue::IntFunctor intFunctor; @@ -4994,6 +5017,8 @@ void tst_QObject::returnValue() QCOMPARE(emit r.returnVariant(45), QVariant(QStringLiteral("hello"))); QVERIFY(connect(&r, &ReturnValue::returnVariant, intFunctor)); QCOMPARE(emit r.returnVariant(45), QVariant(45)); + QVERIFY(connect(&r, &ReturnValue::returnVariant, &receiver, &ReturnValue::return23, Qt::QueuedConnection)); + QCOMPARE(emit r.returnVariant(45), QVariant(45)); QCOMPARE(emit r.returnInt(45), int()); QVERIFY(connect(&r, &ReturnValue::returnInt, &receiver, &ReturnValue::returnVoidSlot, type)); @@ -5006,7 +5031,12 @@ void tst_QObject::returnValue() QCOMPARE(emit r.returnInt(45), int(23)); QVERIFY(connect(&r, &ReturnValue::returnInt, intFunctor)); QCOMPARE(emit r.returnInt(45), int(45)); + QVERIFY(connect(&r, &ReturnValue::returnInt, &receiver, &ReturnValue::return23, Qt::QueuedConnection)); + QCOMPARE(emit r.returnInt(45), int(45)); + + QCoreApplication::processEvents(); } + if (isBlockingQueued) { thread.quit(); thread.wait(); @@ -5055,6 +5085,29 @@ void tst_QObject::returnValue2() QVERIFY(connect(&r, SIGNAL(returnCustomType(int)), &receiver, SLOT(returnVoidSlot()), type)); QCOMPARE((emit r.returnCustomType(45)).value(), CustomType().value()); } + if (!isBlockingQueued) { + // queued connection should not forward the return value + CheckInstanceCount checker; + ReturnValue r; + QVERIFY(connect(&r, SIGNAL(returnVariant(int)), &receiver, SLOT(returnVariantSlot(int)), Qt::QueuedConnection)); + QCOMPARE(emit r.returnVariant(45), QVariant()); + QVERIFY(connect(&r, SIGNAL(returnString(int)), &receiver, SLOT(returnStringSlot(int)), Qt::QueuedConnection)); + QCOMPARE(emit r.returnString(45), QString()); + QVERIFY(connect(&r, SIGNAL(returnInt(int)), &receiver, SLOT(returnIntSlot(int)), Qt::QueuedConnection)); + QCOMPARE(emit r.returnInt(45), int()); + QVERIFY(connect(&r, SIGNAL(returnCustomType(int)), &receiver, SLOT(returnCustomTypeSlot(int)), Qt::QueuedConnection)); + QCOMPARE((emit r.returnCustomType(45)).value(), CustomType().value()); + QCoreApplication::processEvents(); + + //Queued conneciton with different return type should be safe + QVERIFY(connect(&r, SIGNAL(returnVariant(int)), &receiver, SLOT(returnStringSlot(int)), Qt::QueuedConnection)); + QCOMPARE(emit r.returnVariant(48), QVariant()); + QVERIFY(connect(&r, SIGNAL(returnCustomType(int)), &receiver, SLOT(returnIntSlot(int)), Qt::QueuedConnection)); + QCOMPARE((emit r.returnCustomType(48)).value(), CustomType().value()); + QVERIFY(connect(&r, SIGNAL(returnVoid(int)), &receiver, SLOT(returnCustomTypeSlot(int)), Qt::QueuedConnection)); + emit r.returnVoid(48); + QCoreApplication::processEvents(); + } { // connected to many slots ReturnValue r; QVERIFY(connect(&r, SIGNAL(returnInt(int)), &receiver, SLOT(returnIntSlot(int)), type)); @@ -5063,6 +5116,8 @@ void tst_QObject::returnValue2() QCOMPARE(emit r.returnInt(45), int(45)); QVERIFY(connect(&r, SIGNAL(returnInt(int)), &receiver, SLOT(return23()), type)); QCOMPARE(emit r.returnInt(45), int(23)); + QVERIFY(connect(&r, SIGNAL(returnInt(int)), &receiver, SLOT(returnIntSlot(int)), Qt::QueuedConnection)); + QCOMPARE(emit r.returnInt(45), int(23)); QVERIFY(connect(&r, SIGNAL(returnString(int)), &receiver, SLOT(returnStringSlot(int)), type)); QCOMPARE(emit r.returnString(45), QString(QStringLiteral("45"))); @@ -5070,6 +5125,8 @@ void tst_QObject::returnValue2() QCOMPARE(emit r.returnString(45), QString(QStringLiteral("45"))); QVERIFY(connect(&r, SIGNAL(returnString(int)), &receiver, SLOT(returnHello()), type)); QCOMPARE(emit r.returnString(45), QString(QStringLiteral("hello"))); + QVERIFY(connect(&r, SIGNAL(returnString(int)), &receiver, SLOT(returnStringSlot(int)), Qt::QueuedConnection)); + QCOMPARE(emit r.returnString(45), QString(QStringLiteral("hello"))); } if (isBlockingQueued) { thread.quit();