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home:Alexander_Naumov:SLE-12:Update
libqt5-qtbase.9686
0003-Fix-data-race-on-QLoggingCategory-when-usi...
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File 0003-Fix-data-race-on-QLoggingCategory-when-using-qDebug-.patch of Package libqt5-qtbase.9686
From 884b38157689a893ace0a4c793fab921167abb2c Mon Sep 17 00:00:00 2001 From: David Faure <david.faure@kdab.com> Date: Sun, 8 Jun 2014 21:46:24 +0200 Subject: [PATCH 1/1] Fix data race on QLoggingCategory when using qDebug from multiple threads setEnabled() would race with isEnabled()/isDebugEnabled()/etc. Change-Id: I2004cba81d5417a634b97f5c2f98d3a4ab71770d Reviewed-by: David Faure <david.faure@kdab.com> --- src/corelib/arch/qatomic_bootstrap.h | 4 ++- src/corelib/io/qloggingcategory.cpp | 36 ++++++++++++++++++-------- src/corelib/io/qloggingcategory.h | 35 +++++++++++++++++++------ tests/auto/corelib/io/qdebug/qdebug.pro | 2 +- tests/auto/corelib/io/qdebug/tst_qdebug.cpp | 40 +++++++++++++++++++++++++++++ 5 files changed, 97 insertions(+), 20 deletions(-) diff --git a/src/corelib/arch/qatomic_bootstrap.h b/src/corelib/arch/qatomic_bootstrap.h index 7f17387..0d6843a 100644 --- a/src/corelib/arch/qatomic_bootstrap.h +++ b/src/corelib/arch/qatomic_bootstrap.h @@ -67,8 +67,10 @@ template <typename T> struct QAtomicOps: QGenericAtomicOps<QAtomicOps<T> > return --_q_value != 0; } - static bool testAndSetRelaxed(T &_q_value, T expectedValue, T newValue) Q_DECL_NOTHROW + static bool testAndSetRelaxed(T &_q_value, T expectedValue, T newValue, T *currentValue = 0) Q_DECL_NOTHROW { + if (currentValue) + *currentValue = _q_value; if (_q_value == expectedValue) { _q_value = newValue; return true; diff --git a/src/corelib/io/qloggingcategory.cpp b/src/corelib/io/qloggingcategory.cpp index 518052e..45fab11 100644 --- a/src/corelib/io/qloggingcategory.cpp +++ b/src/corelib/io/qloggingcategory.cpp @@ -50,6 +50,18 @@ const char qtDefaultCategoryName[] = "default"; Q_GLOBAL_STATIC_WITH_ARGS(QLoggingCategory, qtDefaultCategory, (qtDefaultCategoryName)) +#ifndef Q_ATOMIC_INT8_IS_SUPPORTED +static void setBoolLane(QBasicAtomicInt *atomic, bool enable, int shift) +{ + const int bit = 1 << shift; + + if (enable) + atomic->fetchAndOrRelaxed(bit); + else + atomic->fetchAndAndRelaxed(~bit); +} +#endif + /*! \class QLoggingCategory \inmodule QtCore @@ -171,13 +183,11 @@ Q_GLOBAL_STATIC_WITH_ARGS(QLoggingCategory, qtDefaultCategory, */ QLoggingCategory::QLoggingCategory(const char *category) : d(0), - name(0), - enabledDebug(true), - enabledWarning(true), - enabledCritical(true) + name(0) { Q_UNUSED(d); Q_UNUSED(placeholder); + enabled.store(0x01010101); // enabledDebug = enabledWarning = enabledCritical = true; const bool isDefaultCategory = (category == 0) || (strcmp(category, qtDefaultCategoryName) == 0); @@ -249,9 +259,9 @@ QLoggingCategory::~QLoggingCategory() bool QLoggingCategory::isEnabled(QtMsgType msgtype) const { switch (msgtype) { - case QtDebugMsg: return enabledDebug; - case QtWarningMsg: return enabledWarning; - case QtCriticalMsg: return enabledCritical; + case QtDebugMsg: return isDebugEnabled(); + case QtWarningMsg: return isWarningEnabled(); + case QtCriticalMsg: return isCriticalEnabled(); case QtFatalMsg: return true; } return false; @@ -270,9 +280,15 @@ bool QLoggingCategory::isEnabled(QtMsgType msgtype) const void QLoggingCategory::setEnabled(QtMsgType type, bool enable) { switch (type) { - case QtDebugMsg: enabledDebug = enable; break; - case QtWarningMsg: enabledWarning = enable; break; - case QtCriticalMsg: enabledCritical = enable; break; +#ifdef Q_ATOMIC_INT8_IS_SUPPORTED + case QtDebugMsg: bools.enabledDebug.store(enable); break; + case QtWarningMsg: bools.enabledWarning.store(enable); break; + case QtCriticalMsg: bools.enabledCritical.store(enable); break; +#else + case QtDebugMsg: setBoolLane(&enabled, enable, DebugShift); break; + case QtWarningMsg: setBoolLane(&enabled, enable, WarningShift); break; + case QtCriticalMsg: setBoolLane(&enabled, enable, CriticalShift); break; +#endif case QtFatalMsg: break; } } diff --git a/src/corelib/io/qloggingcategory.h b/src/corelib/io/qloggingcategory.h index 4aec8e6..573af21 100644 --- a/src/corelib/io/qloggingcategory.h +++ b/src/corelib/io/qloggingcategory.h @@ -57,10 +57,15 @@ public: bool isEnabled(QtMsgType type) const; void setEnabled(QtMsgType type, bool enable); - bool isDebugEnabled() const { return enabledDebug; } - bool isWarningEnabled() const { return enabledWarning; } - bool isCriticalEnabled() const { return enabledCritical; } - +#ifdef Q_ATOMIC_INT8_IS_SUPPORTED + bool isDebugEnabled() const { return bools.enabledDebug.load(); } + bool isWarningEnabled() const { return bools.enabledWarning.load(); } + bool isCriticalEnabled() const { return bools.enabledCritical.load(); } +#else + bool isDebugEnabled() const { return enabled.load() >> DebugShift & 1; } + bool isWarningEnabled() const { return enabled.load() >> WarningShift & 1; } + bool isCriticalEnabled() const { return enabled.load() >> CriticalShift & 1; } +#endif const char *categoryName() const { return name; } // allows usage of both factory method and variable in qCX macros @@ -78,10 +83,24 @@ private: void *d; // reserved for future use const char *name; - bool enabledDebug; - bool enabledWarning; - bool enabledCritical; - bool placeholder[5]; // reserve for future use +#ifdef Q_BIG_ENDIAN + enum { DebugShift = 0, WarningShift = 8, CriticalShift = 16 }; +#else + enum { DebugShift = 24, WarningShift = 16, CriticalShift = 8 }; +#endif + + struct AtomicBools { +#ifdef Q_ATOMIC_INT8_IS_SUPPORTED + QBasicAtomicInteger<bool> enabledDebug; + QBasicAtomicInteger<bool> enabledWarning; + QBasicAtomicInteger<bool> enabledCritical; +#endif + }; + union { + AtomicBools bools; + QBasicAtomicInt enabled; + }; + bool placeholder[4]; // reserve for future use }; #define Q_DECLARE_LOGGING_CATEGORY(name) \ diff --git a/tests/auto/corelib/io/qdebug/qdebug.pro b/tests/auto/corelib/io/qdebug/qdebug.pro index 820c17f..5e902bb 100644 --- a/tests/auto/corelib/io/qdebug/qdebug.pro +++ b/tests/auto/corelib/io/qdebug/qdebug.pro @@ -1,5 +1,5 @@ CONFIG += testcase parallel_test TARGET = tst_qdebug -QT = core testlib +QT = core testlib concurrent SOURCES = tst_qdebug.cpp DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0 diff --git a/tests/auto/corelib/io/qdebug/tst_qdebug.cpp b/tests/auto/corelib/io/qdebug/tst_qdebug.cpp index 80144db..8fd830a 100644 --- a/tests/auto/corelib/io/qdebug/tst_qdebug.cpp +++ b/tests/auto/corelib/io/qdebug/tst_qdebug.cpp @@ -44,6 +44,9 @@ #include <QtCore/QtDebug> #include <QtTest/QtTest> +#include <QtConcurrentRun> +#include <QFutureSynchronizer> + class tst_QDebug: public QObject { Q_OBJECT @@ -59,6 +62,7 @@ private slots: void qDebugQLatin1String() const; void textStreamModifiers() const; void defaultMessagehandler() const; + void threadSafety() const; }; void tst_QDebug::assignment() const @@ -305,5 +309,41 @@ void tst_QDebug::defaultMessagehandler() const QVERIFY(same); } +QMutex s_mutex; +QStringList s_messages; +QSemaphore s_sema; + +static void threadSafeMessageHandler(QtMsgType type, const QMessageLogContext &context, const QString &msg) +{ + QMutexLocker lock(&s_mutex); + s_messages.append(msg); + Q_UNUSED(type); + Q_UNUSED(context); +} + +static void doDebug() // called in each thread +{ + s_sema.acquire(); + qDebug() << "doDebug"; +} + +void tst_QDebug::threadSafety() const +{ + MessageHandlerSetter mhs(threadSafeMessageHandler); + const int numThreads = 10; + QThreadPool::globalInstance()->setMaxThreadCount(numThreads); + QFutureSynchronizer<void> sync; + for (int i = 0; i < numThreads; ++i) { + sync.addFuture(QtConcurrent::run(&doDebug)); + } + s_sema.release(numThreads); + sync.waitForFinished(); + QMutexLocker lock(&s_mutex); + QCOMPARE(s_messages.count(), numThreads); + for (int i = 0; i < numThreads; ++i) { + QCOMPARE(s_messages.at(i), QStringLiteral("doDebug")); + } +} + QTEST_MAIN(tst_QDebug); #include "tst_qdebug.moc" -- 1.9.3
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