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|
diff --git a/src/client/qwaylanddisplay.cpp b/src/client/qwaylanddisplay.cpp
index ea344c61c3a4643f7c725a6287f20d742b210d24..a7ce280a5df538917758e50ba8d2ee117378d546 100644
--- a/src/client/qwaylanddisplay.cpp
+++ b/src/client/qwaylanddisplay.cpp
@@ -85,10 +85,203 @@
#include <errno.h>
+#include <tuple> // for std::tie
+
+static void checkWaylandError(struct wl_display *display)
+{
+ int ecode = wl_display_get_error(display);
+ if ((ecode == EPIPE || ecode == ECONNRESET)) {
+ // special case this to provide a nicer error
+ qWarning("The Wayland connection broke. Did the Wayland compositor die?");
+ } else {
+ qWarning("The Wayland connection experienced a fatal error: %s", strerror(ecode));
+ }
+ _exit(1);
+}
+
QT_BEGIN_NAMESPACE
namespace QtWaylandClient {
+class EventThread : public QThread
+{
+ Q_OBJECT
+public:
+ enum OperatingMode {
+ EmitToDispatch, // Emit the signal, allow dispatching in a differnt thread.
+ SelfDispatch, // Dispatch the events inside this thread.
+ };
+
+ EventThread(struct wl_display * wl, struct wl_event_queue * ev_queue,
+ OperatingMode mode)
+ : m_fd(wl_display_get_fd(wl))
+ , m_pipefd{ -1, -1 }
+ , m_wldisplay(wl)
+ , m_wlevqueue(ev_queue)
+ , m_mode(mode)
+ , m_reading(true)
+ , m_quitting(false)
+ {
+ setObjectName(QStringLiteral("WaylandEventThread"));
+ }
+
+ void readAndDispatchEvents()
+ {
+ /*
+ * Dispatch pending events and flush the requests at least once. If the event thread
+ * is not reading, try to call _prepare_read() to allow the event thread to poll().
+ * If that fails, re-try dispatch & flush again until _prepare_read() is successful.
+ *
+ * This allow any call to readAndDispatchEvents() to start event thread's polling,
+ * not only the one issued from event thread's waitForReading(), which means functions
+ * called from dispatch_pending() can safely spin an event loop.
+ */
+ for (;;) {
+ if (dispatchQueuePending() < 0) {
+ checkWaylandError(m_wldisplay);
+ return;
+ }
+
+ wl_display_flush(m_wldisplay);
+
+ // We have to check if event thread is reading every time we dispatch
+ // something, as that may recursively call this function.
+ if (m_reading.loadAcquire())
+ break;
+
+ if (prepareReadQueue() == 0) {
+ QMutexLocker l(&m_mutex);
+ m_reading.storeRelease(true);
+ m_cond.wakeOne();
+ break;
+ }
+ }
+ }
+
+ void stop()
+ {
+ // We have to both write to the pipe and set the flag, as the thread may be
+ // either in the poll() or waiting for _prepare_read().
+ if (m_pipefd[1] != -1 && write(m_pipefd[1], "\0", 1) == -1)
+ qWarning("Failed to write to the pipe: %s.", strerror(errno));
+
+ {
+ QMutexLocker l(&m_mutex);
+ m_quitting = true;
+ m_cond.wakeOne();
+ }
+
+ wait();
+ }
+
+Q_SIGNALS:
+ void needReadAndDispatch();
+
+protected:
+ void run() override
+ {
+ // we use this pipe to make the loop exit otherwise if we simply used a flag on the loop condition, if stop() gets
+ // called while poll() is blocking the thread will never quit since there are no wayland messages coming anymore.
+ struct Pipe
+ {
+ Pipe(int *fds)
+ : fds(fds)
+ {
+ if (qt_safe_pipe(fds) != 0)
+ qWarning("Pipe creation failed. Quitting may hang.");
+ }
+ ~Pipe()
+ {
+ if (fds[0] != -1) {
+ close(fds[0]);
+ close(fds[1]);
+ }
+ }
+
+ int *fds;
+ } pipe(m_pipefd);
+
+ // Make the main thread call wl_prepare_read(), dispatch the pending messages and flush the
+ // outbound ones. Wait until it's done before proceeding, unless we're told to quit.
+ while (waitForReading()) {
+ pollfd fds[2] = { { m_fd, POLLIN, 0 }, { m_pipefd[0], POLLIN, 0 } };
+ poll(fds, 2, -1);
+
+ if (fds[1].revents & POLLIN) {
+ // we don't really care to read the byte that was written here since we're closing down
+ wl_display_cancel_read(m_wldisplay);
+ break;
+ }
+
+ if (fds[0].revents & POLLIN)
+ wl_display_read_events(m_wldisplay);
+ // The polll was succesfull and the event thread did the wl_display_read_events(). On the next iteration of the loop
+ // the event sent to the main thread will cause it to dispatch the messages just read, unless the loop exits in which
+ // case we don't care anymore about them.
+ else
+ wl_display_cancel_read(m_wldisplay);
+ }
+ }
+
+private:
+ bool waitForReading()
+ {
+ Q_ASSERT(QThread::currentThread() == this);
+
+ m_reading.storeRelease(false);
+
+ if (m_mode == SelfDispatch) {
+ readAndDispatchEvents();
+ } else {
+ Q_EMIT needReadAndDispatch();
+
+ QMutexLocker lock(&m_mutex);
+ // m_reading might be set from our emit or some other invocation of
+ // readAndDispatchEvents().
+ while (!m_reading.loadRelaxed() && !m_quitting)
+ m_cond.wait(&m_mutex);
+ }
+
+ return !m_quitting;
+ }
+
+ int dispatchQueuePending()
+ {
+ if (m_wlevqueue)
+ return wl_display_dispatch_queue_pending(m_wldisplay, m_wlevqueue);
+ else
+ return wl_display_dispatch_pending(m_wldisplay);
+ }
+
+ int prepareReadQueue()
+ {
+ if (m_wlevqueue)
+ return wl_display_prepare_read_queue(m_wldisplay, m_wlevqueue);
+ else
+ return wl_display_prepare_read(m_wldisplay);
+ }
+
+ int m_fd;
+ int m_pipefd[2];
+ wl_display *m_wldisplay;
+ wl_event_queue *m_wlevqueue;
+ OperatingMode m_mode;
+
+ /* Concurrency note when operating in EmitToDispatch mode:
+ * m_reading is set to false inside event thread's waitForReading(), and is
+ * set to true inside main thread's readAndDispatchEvents().
+ * The lock is not taken when setting m_reading to false, as the main thread
+ * is not actively waiting for it to turn false. However, the lock is taken
+ * inside readAndDispatchEvents() before setting m_reading to true,
+ * as the event thread is actively waiting for it under the wait condition.
+ */
+
+ QAtomicInteger<bool> m_reading;
+ bool m_quitting;
+ QMutex m_mutex;
+ QWaitCondition m_cond;
+};
+
Q_LOGGING_CATEGORY(lcQpaWayland, "qt.qpa.wayland"); // for general (uncategorized) Wayland platform logging
struct wl_surface *QWaylandDisplay::createSurface(void *handle)
@@ -158,17 +351,16 @@ QWaylandDisplay::QWaylandDisplay(QWaylandIntegration *waylandIntegration)
if (!mXkbContext)
qCWarning(lcQpaWayland, "failed to create xkb context");
#endif
-
- forceRoundTrip();
-
- if (!mWaitingScreens.isEmpty()) {
- // Give wl_output.done and zxdg_output_v1.done events a chance to arrive
- forceRoundTrip();
- }
}
QWaylandDisplay::~QWaylandDisplay(void)
{
+ if (m_eventThread)
+ m_eventThread->stop();
+
+ if (m_frameEventQueueThread)
+ m_frameEventQueueThread->stop();
+
if (mSyncCallback)
wl_callback_destroy(mSyncCallback);
@@ -189,6 +381,18 @@ QWaylandDisplay::~QWaylandDisplay(void)
wl_display_disconnect(mDisplay);
}
+// Steps which is called just after constructor. This separates registry_global() out of the constructor
+// so that factory functions in integration can be overridden.
+void QWaylandDisplay::initialize()
+{
+ forceRoundTrip();
+
+ if (!mWaitingScreens.isEmpty()) {
+ // Give wl_output.done and zxdg_output_v1.done events a chance to arrive
+ forceRoundTrip();
+ }
+}
+
void QWaylandDisplay::ensureScreen()
{
if (!mScreens.empty() || mPlaceholderScreen)
@@ -203,98 +407,37 @@ void QWaylandDisplay::ensureScreen()
void QWaylandDisplay::checkError() const
{
- int ecode = wl_display_get_error(mDisplay);
- if ((ecode == EPIPE || ecode == ECONNRESET)) {
- // special case this to provide a nicer error
- qWarning("The Wayland connection broke. Did the Wayland compositor die?");
- } else {
- qWarning("The Wayland connection experienced a fatal error: %s", strerror(ecode));
- }
- _exit(1);
+ checkWaylandError(mDisplay);
}
+// Called in main thread, either from queued signal or directly.
void QWaylandDisplay::flushRequests()
{
- if (wl_display_prepare_read(mDisplay) == 0) {
- wl_display_read_events(mDisplay);
- }
-
- if (wl_display_dispatch_pending(mDisplay) < 0)
- checkError();
-
- {
- QReadLocker locker(&m_frameQueueLock);
- for (const FrameQueue &q : mExternalQueues) {
- QMutexLocker locker(q.mutex);
- while (wl_display_prepare_read_queue(mDisplay, q.queue) != 0)
- wl_display_dispatch_queue_pending(mDisplay, q.queue);
- wl_display_read_events(mDisplay);
- wl_display_dispatch_queue_pending(mDisplay, q.queue);
- }
- }
-
- wl_display_flush(mDisplay);
-}
-
-void QWaylandDisplay::blockingReadEvents()
-{
- if (wl_display_dispatch(mDisplay) < 0)
- checkError();
-}
-
-void QWaylandDisplay::destroyFrameQueue(const QWaylandDisplay::FrameQueue &q)
-{
- QWriteLocker locker(&m_frameQueueLock);
- auto it = std::find_if(mExternalQueues.begin(),
- mExternalQueues.end(),
- [&q] (const QWaylandDisplay::FrameQueue &other){ return other.queue == q.queue; });
- Q_ASSERT(it != mExternalQueues.end());
- mExternalQueues.erase(it);
- if (q.queue != nullptr)
- wl_event_queue_destroy(q.queue);
- delete q.mutex;
+ m_eventThread->readAndDispatchEvents();
}
-QWaylandDisplay::FrameQueue QWaylandDisplay::createFrameQueue()
+// We have to wait until we have an eventDispatcher before creating the eventThread,
+// otherwise forceRoundTrip() may block inside _events_read() because eventThread is
+// polling.
+void QWaylandDisplay::initEventThread()
{
- QWriteLocker locker(&m_frameQueueLock);
- FrameQueue q{createEventQueue()};
- mExternalQueues.append(q);
- return q;
-}
+ m_eventThread.reset(
+ new EventThread(mDisplay, /* default queue */ nullptr, EventThread::EmitToDispatch));
+ connect(m_eventThread.get(), &EventThread::needReadAndDispatch, this,
+ &QWaylandDisplay::flushRequests, Qt::QueuedConnection);
+ m_eventThread->start();
-wl_event_queue *QWaylandDisplay::createEventQueue()
-{
- return wl_display_create_queue(mDisplay);
+ // wl_display_disconnect() free this.
+ m_frameEventQueue = wl_display_create_queue(mDisplay);
+ m_frameEventQueueThread.reset(
+ new EventThread(mDisplay, m_frameEventQueue, EventThread::SelfDispatch));
+ m_frameEventQueueThread->start();
}
-void QWaylandDisplay::dispatchQueueWhile(wl_event_queue *queue, std::function<bool ()> condition, int timeout)
+void QWaylandDisplay::blockingReadEvents()
{
- if (!condition())
- return;
-
- QElapsedTimer timer;
- timer.start();
- struct pollfd pFd = qt_make_pollfd(wl_display_get_fd(mDisplay), POLLIN);
- while (timeout == -1 || timer.elapsed() < timeout) {
- while (wl_display_prepare_read_queue(mDisplay, queue) != 0)
- wl_display_dispatch_queue_pending(mDisplay, queue);
-
- wl_display_flush(mDisplay);
-
- const int remaining = qMax(timeout - timer.elapsed(), 0ll);
- const int pollTimeout = timeout == -1 ? -1 : remaining;
- if (qt_poll_msecs(&pFd, 1, pollTimeout) > 0)
- wl_display_read_events(mDisplay);
- else
- wl_display_cancel_read(mDisplay);
-
- if (wl_display_dispatch_queue_pending(mDisplay, queue) < 0)
- checkError();
-
- if (!condition())
- break;
- }
+ if (wl_display_dispatch(mDisplay) < 0)
+ checkWaylandError(mDisplay);
}
QWaylandScreen *QWaylandDisplay::screenForOutput(struct wl_output *output) const
@@ -669,4 +812,6 @@ QWaylandCursorTheme *QWaylandDisplay::loadCursorTheme(const QString &name, int p
} // namespace QtWaylandClient
+#include "qwaylanddisplay.moc"
+
QT_END_NAMESPACE
diff --git a/src/client/qwaylanddisplay_p.h b/src/client/qwaylanddisplay_p.h
index 09a1736a267d2816873667e9f1ecb4f4892f0ed0..42bc661d3064d770aa9fde8bd62ecdbbc89732a2 100644
--- a/src/client/qwaylanddisplay_p.h
+++ b/src/client/qwaylanddisplay_p.h
@@ -109,6 +109,7 @@ class QWaylandSurface;
class QWaylandShellIntegration;
class QWaylandCursor;
class QWaylandCursorTheme;
+class EventThread;
typedef void (*RegistryListener)(void *data,
struct wl_registry *registry,
@@ -120,15 +121,11 @@ class Q_WAYLAND_CLIENT_EXPORT QWaylandDisplay : public QObject, public QtWayland
Q_OBJECT
public:
- struct FrameQueue {
- FrameQueue(wl_event_queue *q = nullptr) : queue(q), mutex(new QMutex) {}
- wl_event_queue *queue;
- QMutex *mutex;
- };
-
QWaylandDisplay(QWaylandIntegration *waylandIntegration);
~QWaylandDisplay(void) override;
+ void initialize();
+
#if QT_CONFIG(xkbcommon)
struct xkb_context *xkbContext() const { return mXkbContext.get(); }
#endif
@@ -210,12 +207,11 @@ public:
void handleKeyboardFocusChanged(QWaylandInputDevice *inputDevice);
void handleWindowDestroyed(QWaylandWindow *window);
- wl_event_queue *createEventQueue();
- FrameQueue createFrameQueue();
- void destroyFrameQueue(const FrameQueue &q);
- void dispatchQueueWhile(wl_event_queue *queue, std::function<bool()> condition, int timeout = -1);
+ wl_event_queue *frameEventQueue() { return m_frameEventQueue; };
bool isKeyboardAvailable() const;
+
+ void initEventThread();
public slots:
void blockingReadEvents();
void flushRequests();
@@ -238,6 +234,9 @@ private:
};
struct wl_display *mDisplay = nullptr;
+ QScopedPointer<EventThread> m_eventThread;
+ wl_event_queue *m_frameEventQueue = nullptr;
+ QScopedPointer<EventThread> m_frameEventQueueThread;
QtWayland::wl_compositor mCompositor;
QScopedPointer<QWaylandShm> mShm;
QList<QWaylandScreen *> mWaitingScreens;
@@ -274,11 +273,9 @@ private:
QWaylandInputDevice *mLastInputDevice = nullptr;
QPointer<QWaylandWindow> mLastInputWindow;
QPointer<QWaylandWindow> mLastKeyboardFocus;
- QVector<QWaylandWindow *> mActiveWindows;
- QVector<FrameQueue> mExternalQueues;
+ QList<QWaylandWindow *> mActiveWindows;
struct wl_callback *mSyncCallback = nullptr;
static const wl_callback_listener syncCallbackListener;
- QReadWriteLock m_frameQueueLock;
bool mClientSideInputContextRequested = !QPlatformInputContextFactory::requested().isNull();
diff --git a/src/client/qwaylandintegration.cpp b/src/client/qwaylandintegration.cpp
index e5e7dd42c9b0145f4c9852f7e15dcc83106c321d..3b876047293887d17eeb28819c7386ded9e1f131 100644
--- a/src/client/qwaylandintegration.cpp
+++ b/src/client/qwaylandintegration.cpp
@@ -192,14 +192,18 @@ QAbstractEventDispatcher *QWaylandIntegration::createEventDispatcher() const
void QWaylandIntegration::initialize()
{
+ mDisplay->initEventThread();
+
+ // Call after eventDispatcher is fully connected, for QWaylandDisplay::forceRoundTrip()
+ mDisplay->initialize();
+
+ // But the aboutToBlock() and awake() should be connected after initializePlatform().
+ // Otherwise the connected flushRequests() may consumes up all events before processEvents starts to wait,
+ // so that processEvents(QEventLoop::WaitForMoreEvents) may be blocked in the forceRoundTrip().
QAbstractEventDispatcher *dispatcher = QGuiApplicationPrivate::eventDispatcher;
QObject::connect(dispatcher, SIGNAL(aboutToBlock()), mDisplay.data(), SLOT(flushRequests()));
QObject::connect(dispatcher, SIGNAL(awake()), mDisplay.data(), SLOT(flushRequests()));
- int fd = wl_display_get_fd(mDisplay->wl_display());
- QSocketNotifier *sn = new QSocketNotifier(fd, QSocketNotifier::Read, mDisplay.data());
- QObject::connect(sn, SIGNAL(activated(QSocketDescriptor)), mDisplay.data(), SLOT(flushRequests()));
-
// Qt does not support running with no screens
mDisplay->ensureScreen();
}
diff --git a/src/client/qwaylandwindow.cpp b/src/client/qwaylandwindow.cpp
index 1597f67e63ae7834ded50e25b0acf86b71abcd73..7de19a742b6d3f6a3ce0955f59a5bf2879d29c9e 100644
--- a/src/client/qwaylandwindow.cpp
+++ b/src/client/qwaylandwindow.cpp
@@ -76,7 +76,6 @@ QWaylandWindow *QWaylandWindow::mMouseGrab = nullptr;
QWaylandWindow::QWaylandWindow(QWindow *window, QWaylandDisplay *display)
: QPlatformWindow(window)
, mDisplay(display)
- , mFrameQueue(mDisplay->createFrameQueue())
, mResizeAfterSwap(qEnvironmentVariableIsSet("QT_WAYLAND_RESIZE_AFTER_SWAP"))
{
{
@@ -95,8 +94,6 @@ QWaylandWindow::QWaylandWindow(QWindow *window, QWaylandDisplay *display)
QWaylandWindow::~QWaylandWindow()
{
- mDisplay->destroyFrameQueue(mFrameQueue);
-
delete mWindowDecoration;
if (mSurface)
@@ -635,6 +632,8 @@ const wl_callback_listener QWaylandWindow::callbackListener = {
void QWaylandWindow::handleFrameCallback()
{
+ QMutexLocker locker(&mFrameSyncMutex);
+
mWaitingForFrameCallback = false;
mFrameCallbackElapsedTimer.invalidate();
@@ -656,12 +655,16 @@ void QWaylandWindow::handleFrameCallback()
mWaitingForUpdateDelivery = true;
QMetaObject::invokeMethod(this, doHandleExpose, Qt::QueuedConnection);
}
+
+ mFrameSyncWait.notify_all();
}
bool QWaylandWindow::waitForFrameSync(int timeout)
{
- QMutexLocker locker(mFrameQueue.mutex);
- mDisplay->dispatchQueueWhile(mFrameQueue.queue, [&]() { return mWaitingForFrameCallback; }, timeout);
+ QMutexLocker locker(&mFrameSyncMutex);
+
+ QDeadlineTimer deadline(timeout);
+ while (mWaitingForFrameCallback && mFrameSyncWait.wait(&mFrameSyncMutex, deadline)) { }
if (mWaitingForFrameCallback) {
qCDebug(lcWaylandBackingstore) << "Didn't receive frame callback in time, window should now be inexposed";
@@ -1157,8 +1160,11 @@ void QWaylandWindow::requestUpdate()
Q_ASSERT(hasPendingUpdateRequest()); // should be set by QPA
// If we have a frame callback all is good and will be taken care of there
- if (mWaitingForFrameCallback)
- return;
+ {
+ QMutexLocker locker(&mFrameSyncMutex);
+ if (mWaitingForFrameCallback)
+ return;
+ }
// If we've already called deliverUpdateRequest(), but haven't seen any attach+commit/swap yet
// This is a somewhat redundant behavior and might indicate a bug in the calling code, so log
@@ -1171,7 +1177,12 @@ void QWaylandWindow::requestUpdate()
// so use invokeMethod to delay the delivery a bit.
QMetaObject::invokeMethod(this, [this] {
// Things might have changed in the meantime
- if (hasPendingUpdateRequest() && !mWaitingForFrameCallback)
+ {
+ QMutexLocker locker(&mFrameSyncMutex);
+ if (mWaitingForFrameCallback)
+ return;
+ }
+ if (hasPendingUpdateRequest())
deliverUpdateRequest();
}, Qt::QueuedConnection);
}
@@ -1191,9 +1202,10 @@ void QWaylandWindow::handleUpdate()
if (!mSurface)
return;
- QMutexLocker locker(mFrameQueue.mutex);
+ QMutexLocker locker(&mFrameSyncMutex);
+
struct ::wl_surface *wrappedSurface = reinterpret_cast<struct ::wl_surface *>(wl_proxy_create_wrapper(mSurface->object()));
- wl_proxy_set_queue(reinterpret_cast<wl_proxy *>(wrappedSurface), mFrameQueue.queue);
+ wl_proxy_set_queue(reinterpret_cast<wl_proxy *>(wrappedSurface), mDisplay->frameEventQueue());
mFrameCallback = wl_surface_frame(wrappedSurface);
wl_proxy_wrapper_destroy(wrappedSurface);
wl_callback_add_listener(mFrameCallback, &QWaylandWindow::callbackListener, this);
@@ -1203,6 +1215,8 @@ void QWaylandWindow::handleUpdate()
// Start a timer for handling the case when the compositor stops sending frame callbacks.
if (mFrameCallbackTimeout > 0) {
QMetaObject::invokeMethod(this, [this] {
+ QMutexLocker locker(&mFrameSyncMutex);
+
if (mWaitingForFrameCallback) {
if (mFrameCallbackCheckIntervalTimerId < 0)
mFrameCallbackCheckIntervalTimerId = startTimer(mFrameCallbackTimeout);
diff --git a/src/client/qwaylandwindow_p.h b/src/client/qwaylandwindow_p.h
index e06879620c3d033f093b0866f018ec80a72a97c3..d45980a80e9ecc9c5003fa2144de63e6337bda8a 100644
--- a/src/client/qwaylandwindow_p.h
+++ b/src/client/qwaylandwindow_p.h
@@ -232,7 +232,7 @@ protected:
int mFrameCallbackCheckIntervalTimerId = -1;
QElapsedTimer mFrameCallbackElapsedTimer;
struct ::wl_callback *mFrameCallback = nullptr;
- QWaylandDisplay::FrameQueue mFrameQueue;
+ QMutex mFrameSyncMutex;
QWaitCondition mFrameSyncWait;
// True when we have called deliverRequestUpdate, but the client has not yet attached a new buffer
|