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author | Bradley T. Hughes <bradley.hughes@nokia.com> | 2009-10-16 14:18:36 (GMT) |
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committer | Bradley T. Hughes <bradley.hughes@nokia.com> | 2009-10-20 12:16:10 (GMT) |
commit | 31f1ff91028dd7f90925d5b3737e4d88b5fb07aa (patch) | |
tree | 56a4adc8b1efa252a0709750137f3f12f7014f7d /src/corelib/kernel/qeventdispatcher_win.cpp | |
parent | c238f7b7e299e742e71fdb043a7bc81bbfd6c419 (diff) | |
download | Qt-31f1ff91028dd7f90925d5b3737e4d88b5fb07aa.zip Qt-31f1ff91028dd7f90925d5b3737e4d88b5fb07aa.tar.gz Qt-31f1ff91028dd7f90925d5b3737e4d88b5fb07aa.tar.bz2 |
Send posted events in response to WM_QT_SENDPOSTEDEVENTS
(which is just WM_USER+1)
Delay the next WM_QT_SENDPOSTEDEVENTS iff there is a WM_TIMER
or input event pending
We also need to break out of processEvents() after seeing this
message, to prevent livelocking in the prescence of fast timers.
I also took the liberty of defining WM_QT_SOCKETNOTIFIER (WM_USER)
at the same time (to give clear meaning to what WM_USER and WM_USER+1
are used for).
Reviewed-by: Prasanth Ullattil
Diffstat (limited to 'src/corelib/kernel/qeventdispatcher_win.cpp')
-rw-r--r-- | src/corelib/kernel/qeventdispatcher_win.cpp | 178 |
1 files changed, 94 insertions, 84 deletions
diff --git a/src/corelib/kernel/qeventdispatcher_win.cpp b/src/corelib/kernel/qeventdispatcher_win.cpp index 1e6402f..f7de29d 100644 --- a/src/corelib/kernel/qeventdispatcher_win.cpp +++ b/src/corelib/kernel/qeventdispatcher_win.cpp @@ -64,6 +64,11 @@ extern uint qGlobalPostedEventsCount(); # define TIME_KILL_SYNCHRONOUS 0x0100 #endif +enum { + WM_QT_SOCKETNOTIFIER = WM_USER, + WM_QT_SENDPOSTEDEVENTS = WM_USER + 1 +}; + #if defined(Q_OS_WINCE) QT_BEGIN_INCLUDE_NAMESPACE #include <winsock.h> @@ -327,6 +332,11 @@ public: // internal window handle used for socketnotifiers/timers/etc HWND internalHwnd; + // for controlling when to send posted events + QAtomicInt serialNumber; + int lastSerialNumber; + QAtomicInt wakeUps; + // timers WinTimerVec timerVec; WinTimerDict timerDict; @@ -340,9 +350,6 @@ public: QSNDict sn_except; void doWsaAsyncSelect(int socket); - // event notifier - QWinEventNotifier wakeUpNotifier; - QList<QWinEventNotifier *> winEventNotifierList; void activateEventNotifier(QWinEventNotifier * wen); @@ -351,19 +358,13 @@ public: }; QEventDispatcherWin32Private::QEventDispatcherWin32Private() - : threadId(GetCurrentThreadId()), interrupt(false), internalHwnd(0) + : threadId(GetCurrentThreadId()), interrupt(false), internalHwnd(0), serialNumber(0), lastSerialNumber(0), wakeUps(0) { resolveTimerAPI(); - - wakeUpNotifier.setHandle(CreateEvent(0, FALSE, FALSE, 0)); - if (!wakeUpNotifier.handle()) - qWarning("QEventDispatcher: Creating QEventDispatcherWin32Private wakeup event failed"); } QEventDispatcherWin32Private::~QEventDispatcherWin32Private() { - wakeUpNotifier.setEnabled(false); - CloseHandle(wakeUpNotifier.handle()); if (internalHwnd) DestroyWindow(internalHwnd); QString className = QLatin1String("QEventDispatcherWin32_Internal_Widget") + QString::number(quintptr(qt_internal_proc)); @@ -408,22 +409,35 @@ void WINAPI CALLBACK qt_fast_timer_proc(uint timerId, uint /*reserved*/, DWORD_P LRESULT CALLBACK qt_internal_proc(HWND hwnd, UINT message, WPARAM wp, LPARAM lp) { - if (message == WM_NCCREATE) { - return true; - } else if (message == WM_USER) { + if (message == WM_NCCREATE) + return true; - // socket notifier message - MSG msg; - msg.hwnd = hwnd; - msg.message = message; - msg.wParam = wp; - msg.lParam = lp; + MSG msg; + msg.hwnd = hwnd; + msg.message = message; + msg.wParam = wp; + msg.lParam = lp; + QCoreApplication *app = QCoreApplication::instance(); + long result; + if (!app) { + if (message == WM_TIMER) + KillTimer(hwnd, wp); + return 0; + } else if (app->filterEvent(&msg, &result)) { + return result; + } - QCoreApplication *app = QCoreApplication::instance(); - long result; - if (app && app->filterEvent(&msg, &result)) - return result; +#ifdef GWLP_USERDATA + QEventDispatcherWin32 *q = (QEventDispatcherWin32 *) GetWindowLongPtr(hwnd, GWLP_USERDATA); +#else + QEventDispatcherWin32 *q = (QEventDispatcherWin32 *) GetWindowLong(hwnd, GWL_USERDATA); +#endif + QEventDispatcherWin32Private *d = 0; + if (q != 0) + d = q->d_func(); + if (message == WM_QT_SOCKETNOTIFIER) { + // socket notifier message int type = -1; switch (WSAGETSELECTEVENT(lp)) { case FD_READ: @@ -440,56 +454,52 @@ LRESULT CALLBACK qt_internal_proc(HWND hwnd, UINT message, WPARAM wp, LPARAM lp) break; } if (type >= 0) { - - #ifdef GWLP_USERDATA - QEventDispatcherWin32 *eventDispatcher = - (QEventDispatcherWin32 *) GetWindowLongPtr(hwnd, GWLP_USERDATA); - #else - QEventDispatcherWin32 *eventDispatcher = - (QEventDispatcherWin32 *) GetWindowLong(hwnd, GWL_USERDATA); - #endif - if (eventDispatcher) { - QEventDispatcherWin32Private *d = eventDispatcher->d_func(); - QSNDict *sn_vec[3] = { &d->sn_read, &d->sn_write, &d->sn_except }; - QSNDict *dict = sn_vec[type]; - - QSockNot *sn = dict ? dict->value(wp) : 0; - if (sn) { - QEvent event(QEvent::SockAct); - QCoreApplication::sendEvent(sn->obj, &event); - } + Q_ASSERT(d != 0); + QSNDict *sn_vec[3] = { &d->sn_read, &d->sn_write, &d->sn_except }; + QSNDict *dict = sn_vec[type]; + + QSockNot *sn = dict ? dict->value(wp) : 0; + if (sn) { + QEvent event(QEvent::SockAct); + QCoreApplication::sendEvent(sn->obj, &event); } } return 0; - - } else if (message == WM_TIMER) { - - MSG msg; - msg.hwnd = hwnd; - msg.message = message; - msg.wParam = wp; - msg.lParam = lp; - - QCoreApplication *app = QCoreApplication::instance(); - Q_ASSERT_X(app, "qt_interal_proc", "Timer fired, but no QCoreApplication"); - if (!app) { - KillTimer(hwnd, wp); - return 0; + } else if (message == WM_TIMER) { + if (wp == ~0u) { + KillTimer(d->internalHwnd, wp); + int localSerialNumber = d->serialNumber; + (void) d->wakeUps.fetchAndStoreRelease(0); + if (localSerialNumber != d->lastSerialNumber) { + PostMessage(d->internalHwnd, WM_QT_SENDPOSTEDEVENTS, 0, 0); + } + } else { + Q_ASSERT(d != 0); + d->sendTimerEvent(wp); + } + return 0; + } else if (message == WM_QT_SENDPOSTEDEVENTS) { + int localSerialNumber = d->serialNumber; + + MSG peeked; + if (PeekMessage(&peeked, d->internalHwnd, WM_TIMER, WM_TIMER, PM_NOREMOVE) + || PeekMessage(&peeked, NULL, 0, 0, PM_NOREMOVE | PM_QS_INPUT)) { + // delay the next pass of sendPostedEvents() until we get the special + // WM_TIMER, which allows all pending Windows messages to be processed + SetTimer(d->internalHwnd, ~0u, 0, 0); + } else { + // nothing pending in the queue, let sendPostedEvents go through + d->wakeUps.fetchAndStoreRelease(0); } - long result; - if (app->filterEvent(&msg, &result)) - return result; - - QEventDispatcherWin32 *eventDispatcher = - qobject_cast<QEventDispatcherWin32 *>(QAbstractEventDispatcher::instance()); - Q_ASSERT(eventDispatcher != 0); - QEventDispatcherWin32Private *d = eventDispatcher->d_func(); - d->sendTimerEvent(wp); + if (localSerialNumber != d->lastSerialNumber) { + d->lastSerialNumber = localSerialNumber; + QCoreApplicationPrivate::sendPostedEvents(0, 0, d->threadData); + } return 0; } - return DefWindowProc(hwnd, message, wp, lp); + return DefWindowProc(hwnd, message, wp, lp); } static HWND qt_create_internal_window(const QEventDispatcherWin32 *eventDispatcher) @@ -538,11 +548,6 @@ void QEventDispatcherWin32Private::registerTimer(WinTimerInfo *t) Q_Q(QEventDispatcherWin32); int ok = 0; - - //in the animation api, we delay the start of the animation - //for the dock widgets, we need to use a system timer because dragging a native window - //makes Windows start its own event loop. - //So if this threshold changes, please change STARTSTOP_TIMER_DELAY in qabstractanimation.cpp accordingly. if (t->interval > 15 || !t->interval || !qtimeSetEvent) { ok = 1; if (!t->interval) // optimization for single-shot-zero-timer @@ -608,7 +613,7 @@ void QEventDispatcherWin32Private::doWsaAsyncSelect(int socket) sn_event |= FD_OOB; // BoundsChecker may emit a warning for WSAAsyncSelect when sn_event == 0 // This is a BoundsChecker bug and not a Qt bug - WSAAsyncSelect(socket, internalHwnd, sn_event ? WM_USER : 0, sn_event); + WSAAsyncSelect(socket, internalHwnd, sn_event ? WM_QT_SOCKETNOTIFIER : 0, sn_event); } void QEventDispatcherWin32::createInternalHwnd() @@ -630,6 +635,9 @@ void QEventDispatcherWin32::createInternalHwnd() // start all normal timers for (int i = 0; i < d->timerVec.count(); ++i) d->registerTimer(d->timerVec.at(i)); + + // trigger a call to sendPostedEvents() + wakeUp(); } QEventDispatcherWin32::QEventDispatcherWin32(QObject *parent) @@ -654,11 +662,10 @@ bool QEventDispatcherWin32::processEvents(QEventLoop::ProcessEventsFlags flags) bool canWait; bool retVal = false; do { - QCoreApplicationPrivate::sendPostedEvents(0, 0, d->threadData); - DWORD waitRet = 0; HANDLE pHandles[MAXIMUM_WAIT_OBJECTS - 1]; QVarLengthArray<MSG> processedTimers; + bool seenWM_QT_SENDPOSTEDEVENTS = false; while (!d->interrupt) { DWORD nCount = d->winEventNotifierList.count(); Q_ASSERT(nCount < MAXIMUM_WAIT_OBJECTS - 1); @@ -689,7 +696,7 @@ bool QEventDispatcherWin32::processEvents(QEventLoop::ProcessEventsFlags flags) d->queuedUserInputEvents.append(msg); } if (haveMessage && (flags & QEventLoop::ExcludeSocketNotifiers) - && (msg.message == WM_USER && msg.hwnd == d->internalHwnd)) { + && (msg.message == WM_QT_SOCKETNOTIFIER && msg.hwnd == d->internalHwnd)) { // queue socket events for later processing haveMessage = false; d->queuedSocketEvents.append(msg); @@ -706,7 +713,13 @@ bool QEventDispatcherWin32::processEvents(QEventLoop::ProcessEventsFlags flags) } } if (haveMessage) { - if (msg.message == WM_TIMER) { + if (msg.message == WM_QT_SENDPOSTEDEVENTS && !(flags & QEventLoop::EventLoopExec)) { + if (seenWM_QT_SENDPOSTEDEVENTS) { + PostMessage(d->internalHwnd, WM_QT_SENDPOSTEDEVENTS, 0, 0); + break; + } + seenWM_QT_SENDPOSTEDEVENTS = true; + } else if (msg.message == WM_TIMER) { // avoid live-lock by keeping track of the timers we've already sent bool found = false; for (int i = 0; !found && i < processedTimers.count(); ++i) { @@ -736,9 +749,7 @@ bool QEventDispatcherWin32::processEvents(QEventLoop::ProcessEventsFlags flags) } // still nothing - wait for message or signalled objects - QThreadData *data = d->threadData; canWait = (!retVal - && data->canWait && !d->interrupt && (flags & QEventLoop::WaitForMoreEvents)); if (canWait) { @@ -990,7 +1001,11 @@ void QEventDispatcherWin32::activateEventNotifiers() void QEventDispatcherWin32::wakeUp() { Q_D(QEventDispatcherWin32); - SetEvent(d->wakeUpNotifier.handle()); + d->serialNumber.ref(); + if (d->internalHwnd && d->wakeUps.testAndSetAcquire(0, 1)) { + // post a WM_QT_SENDPOSTEDEVENTS to this thread if there isn't one already pending + PostMessage(d->internalHwnd, WM_QT_SENDPOSTEDEVENTS, 0, 0); + } } void QEventDispatcherWin32::interrupt() @@ -1003,13 +1018,8 @@ void QEventDispatcherWin32::interrupt() void QEventDispatcherWin32::flush() { } - void QEventDispatcherWin32::startingUp() -{ - Q_D(QEventDispatcherWin32); - - if (d->wakeUpNotifier.handle()) d->wakeUpNotifier.setEnabled(true); -} +{ } void QEventDispatcherWin32::closingDown() { |