diff options
Diffstat (limited to 'src/corelib/thread')
-rw-r--r-- | src/corelib/thread/qfutureinterface.cpp | 109 | ||||
-rw-r--r-- | src/corelib/thread/qfutureinterface_p.h | 2 |
2 files changed, 64 insertions, 47 deletions
diff --git a/src/corelib/thread/qfutureinterface.cpp b/src/corelib/thread/qfutureinterface.cpp index 2fe038165b..a29f8ebba7 100644 --- a/src/corelib/thread/qfutureinterface.cpp +++ b/src/corelib/thread/qfutureinterface.cpp @@ -77,13 +77,33 @@ QFutureInterfaceBase::~QFutureInterfaceBase() delete d; } +static inline int switch_on(QAtomicInt &a, int which) +{ + return a.fetchAndOrRelaxed(which) | which; +} + +static inline int switch_off(QAtomicInt &a, int which) +{ + return a.fetchAndAndRelaxed(~which) & ~which; +} + +static inline int switch_from_to(QAtomicInt &a, int from, int to) +{ + int newValue; + int expected = a.load(); + do { + newValue = (expected & ~from) | to; + } while (!a.testAndSetRelaxed(expected, newValue, expected)); + return newValue; +} + void QFutureInterfaceBase::cancel() { QMutexLocker locker(&d->m_mutex); - if (d->state & Canceled) + if (d->state.load() & Canceled) return; - d->state = State((d->state & ~Paused) | Canceled); + switch_from_to(d->state, Paused, Canceled); d->waitCondition.wakeAll(); d->pausedWaitCondition.wakeAll(); d->sendCallOut(QFutureCallOutEvent(QFutureCallOutEvent::Canceled)); @@ -93,10 +113,10 @@ void QFutureInterfaceBase::setPaused(bool paused) { QMutexLocker locker(&d->m_mutex); if (paused) { - d->state = State(d->state | Paused); + switch_on(d->state, Paused); d->sendCallOut(QFutureCallOutEvent(QFutureCallOutEvent::Paused)); } else { - d->state = State(d->state & ~Paused); + switch_off(d->state, Paused); d->pausedWaitCondition.wakeAll(); d->sendCallOut(QFutureCallOutEvent(QFutureCallOutEvent::Resumed)); } @@ -105,29 +125,24 @@ void QFutureInterfaceBase::setPaused(bool paused) void QFutureInterfaceBase::togglePaused() { QMutexLocker locker(&d->m_mutex); - if (d->state & Paused) { - d->state = State(d->state & ~Paused); + if (d->state.load() & Paused) { + switch_off(d->state, Paused); d->pausedWaitCondition.wakeAll(); d->sendCallOut(QFutureCallOutEvent(QFutureCallOutEvent::Resumed)); } else { - d->state = State(d->state | Paused); + switch_on(d->state, Paused); d->sendCallOut(QFutureCallOutEvent(QFutureCallOutEvent::Paused)); } } void QFutureInterfaceBase::setThrottled(bool enable) { - // bail out if we are not changing the state - if ((enable && (d->state & Throttled)) || (!enable && !(d->state & Throttled))) - return; - - // lock and change the state QMutexLocker lock(&d->m_mutex); if (enable) { - d->state = State(d->state | Throttled); + switch_on(d->state, Throttled); } else { - d->state = State(d->state & ~Throttled); - if (!(d->state & Paused)) + switch_off(d->state, Throttled); + if (!(d->state.load() & Paused)) d->pausedWaitCondition.wakeAll(); } } @@ -178,11 +193,15 @@ bool QFutureInterfaceBase::waitForNextResult() void QFutureInterfaceBase::waitForResume() { // return early if possible to avoid taking the mutex lock. - if ((d->state & Paused) == false || (d->state & Canceled)) - return; + { + const int state = d->state.load(); + if (!(state & Paused) || (state & Canceled)) + return; + } QMutexLocker lock(&d->m_mutex); - if ((d->state & Paused) == false || (d->state & Canceled)) + const int state = d->state.load(); + if (!(state & Paused) || (state & Canceled)) return; // decrease active thread count since this thread will wait. @@ -230,7 +249,7 @@ bool QFutureInterfaceBase::isProgressUpdateNeeded() const void QFutureInterfaceBase::reportStarted() { QMutexLocker locker(&d->m_mutex); - if ((d->state & Started) || (d->state & Canceled) || (d->state & Finished)) + if (d->state.load() & (Started|Canceled|Finished)) return; d->setState(State(Started | Running)); @@ -246,11 +265,11 @@ void QFutureInterfaceBase::reportCanceled() void QFutureInterfaceBase::reportException(const QException &exception) { QMutexLocker locker(&d->m_mutex); - if ((d->state & Canceled) || (d->state & Finished)) + if (d->state.load() & (Canceled|Finished)) return; d->m_exceptionStore.setException(exception); - d->state = State(d->state | Canceled); + switch_on(d->state, Canceled); d->waitCondition.wakeAll(); d->pausedWaitCondition.wakeAll(); d->sendCallOut(QFutureCallOutEvent(QFutureCallOutEvent::Canceled)); @@ -260,8 +279,8 @@ void QFutureInterfaceBase::reportException(const QException &exception) void QFutureInterfaceBase::reportFinished() { QMutexLocker locker(&d->m_mutex); - if (!(d->state & Finished)) { - d->state = State((d->state & ~Running) | Finished); + if (!isFinished()) { + switch_from_to(d->state, Running, Finished); d->waitCondition.wakeAll(); d->sendCallOut(QFutureCallOutEvent(QFutureCallOutEvent::Finished)); } @@ -281,7 +300,7 @@ int QFutureInterfaceBase::expectedResultCount() bool QFutureInterfaceBase::queryState(State state) const { - return (d->state & state); + return d->state.load() & state; } void QFutureInterfaceBase::waitForResult(int resultIndex) @@ -289,7 +308,7 @@ void QFutureInterfaceBase::waitForResult(int resultIndex) d->m_exceptionStore.throwPossibleException(); QMutexLocker lock(&d->m_mutex); - if (!(d->state & Running)) + if (!isRunning()) return; lock.unlock(); @@ -299,11 +318,9 @@ void QFutureInterfaceBase::waitForResult(int resultIndex) lock.relock(); - if (d->state & Running) { - const int waitIndex = (resultIndex == -1) ? INT_MAX : resultIndex; - while ((d->state & Running) && d->internal_isResultReadyAt(waitIndex) == false) - d->waitCondition.wait(&d->m_mutex); - } + const int waitIndex = (resultIndex == -1) ? INT_MAX : resultIndex; + while (isRunning() && !d->internal_isResultReadyAt(waitIndex)) + d->waitCondition.wait(&d->m_mutex); d->m_exceptionStore.throwPossibleException(); } @@ -311,7 +328,7 @@ void QFutureInterfaceBase::waitForResult(int resultIndex) void QFutureInterfaceBase::waitForFinished() { QMutexLocker lock(&d->m_mutex); - const bool alreadyFinished = !(d->state & Running); + const bool alreadyFinished = !isRunning(); lock.unlock(); if (!alreadyFinished) { @@ -319,7 +336,7 @@ void QFutureInterfaceBase::waitForFinished() lock.relock(); - while (d->state & Running) + while (isRunning()) d->waitCondition.wait(&d->m_mutex); } @@ -328,7 +345,7 @@ void QFutureInterfaceBase::waitForFinished() void QFutureInterfaceBase::reportResultsReady(int beginIndex, int endIndex) { - if ((d->state & Canceled) || (d->state & Finished) || beginIndex == endIndex) + if (beginIndex == endIndex || (d->state.load() & (Canceled|Finished))) return; d->waitCondition.wakeAll(); @@ -390,7 +407,7 @@ void QFutureInterfaceBase::setProgressValueAndText(int progressValue, if (d->m_progressValue >= progressValue) return; - if ((d->state & Canceled) || (d->state & Finished)) + if (d->state.load() & (Canceled|Finished)) return; if (d->internal_updateProgress(progressValue, progressText)) { @@ -462,10 +479,10 @@ bool QFutureInterfaceBasePrivate::internal_waitForNextResult() if (m_results.hasNextResult()) return true; - while ((state & QFutureInterfaceBase::Running) && m_results.hasNextResult() == false) + while ((state.load() & QFutureInterfaceBase::Running) && m_results.hasNextResult() == false) waitCondition.wait(&m_mutex); - return (!(state & QFutureInterfaceBase::Canceled) && m_results.hasNextResult()); + return !(state.load() & QFutureInterfaceBase::Canceled) && m_results.hasNextResult(); } bool QFutureInterfaceBasePrivate::internal_updateProgress(int progress, @@ -488,16 +505,16 @@ bool QFutureInterfaceBasePrivate::internal_updateProgress(int progress, void QFutureInterfaceBasePrivate::internal_setThrottled(bool enable) { // bail out if we are not changing the state - if ((enable && (state & QFutureInterfaceBase::Throttled)) - || (!enable && !(state & QFutureInterfaceBase::Throttled))) + if ((enable && (state.load() & QFutureInterfaceBase::Throttled)) + || (!enable && !(state.load() & QFutureInterfaceBase::Throttled))) return; // change the state if (enable) { - state = QFutureInterfaceBase::State(state | QFutureInterfaceBase::Throttled); + switch_on(state, QFutureInterfaceBase::Throttled); } else { - state = QFutureInterfaceBase::State(state & ~QFutureInterfaceBase::Throttled); - if (!(state & QFutureInterfaceBase::Paused)) + switch_off(state, QFutureInterfaceBase::Throttled); + if (!(state.load() & QFutureInterfaceBase::Paused)) pausedWaitCondition.wakeAll(); } } @@ -532,7 +549,7 @@ void QFutureInterfaceBasePrivate::connectOutputInterface(QFutureCallOutInterface { QMutexLocker locker(&m_mutex); - if (state & QFutureInterfaceBase::Started) { + if (state.load() & QFutureInterfaceBase::Started) { interface->postCallOutEvent(QFutureCallOutEvent(QFutureCallOutEvent::Started)); interface->postCallOutEvent(QFutureCallOutEvent(QFutureCallOutEvent::ProgressRange, m_progressMinimum, @@ -552,13 +569,13 @@ void QFutureInterfaceBasePrivate::connectOutputInterface(QFutureCallOutInterface it.batchedAdvance(); } - if (state & QFutureInterfaceBase::Paused) + if (state.load() & QFutureInterfaceBase::Paused) interface->postCallOutEvent(QFutureCallOutEvent(QFutureCallOutEvent::Paused)); - if (state & QFutureInterfaceBase::Canceled) + if (state.load() & QFutureInterfaceBase::Canceled) interface->postCallOutEvent(QFutureCallOutEvent(QFutureCallOutEvent::Canceled)); - if (state & QFutureInterfaceBase::Finished) + if (state.load() & QFutureInterfaceBase::Finished) interface->postCallOutEvent(QFutureCallOutEvent(QFutureCallOutEvent::Finished)); outputConnections.append(interface); @@ -577,7 +594,7 @@ void QFutureInterfaceBasePrivate::disconnectOutputInterface(QFutureCallOutInterf void QFutureInterfaceBasePrivate::setState(QFutureInterfaceBase::State newState) { - state = newState; + state.store(newState); } QT_END_NAMESPACE diff --git a/src/corelib/thread/qfutureinterface_p.h b/src/corelib/thread/qfutureinterface_p.h index e2d588cd07..eb0c38421b 100644 --- a/src/corelib/thread/qfutureinterface_p.h +++ b/src/corelib/thread/qfutureinterface_p.h @@ -155,7 +155,7 @@ public: int m_progressValue; // TQ int m_progressMinimum; // TQ int m_progressMaximum; // TQ - QFutureInterfaceBase::State state; + QAtomicInt state; // reads and writes can happen unprotected, both must be atomic QElapsedTimer progressTime; QWaitCondition pausedWaitCondition; QtPrivate::ResultStoreBase m_results; |