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From 725c5de6bdd528d1fa03f1de5ec91585eb110d83 Mon Sep 17 00:00:00 2001
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From: Elvis Lee <kwangwoong.lee@lge.com>
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Date: Wed, 17 Mar 2021 16:31:10 +0900
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Subject: [PATCH 29/40] Connect flushRequest after forceRoundTrip
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If flushRequest is connected with aboutToBlock, the flushRequest
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may consumes all events so that processEvents might be blocked in forceRoundTrip.
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Change-Id: I12b2c506e8442bf0e75f6ab6e418d3e1eea6d68c
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Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>
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(cherry picked from commit 654a54755138c520c3a41210d8078196e9a2c1bf)
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---
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src/client/qwaylandintegration.cpp | 11 +++++++----
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1 file changed, 7 insertions(+), 4 deletions(-)
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diff --git a/src/client/qwaylandintegration.cpp b/src/client/qwaylandintegration.cpp
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index f5632982..3a6fa651 100644
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--- a/src/client/qwaylandintegration.cpp
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+++ b/src/client/qwaylandintegration.cpp
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@@ -192,10 +192,6 @@ QAbstractEventDispatcher *QWaylandIntegration::createEventDispatcher() const
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void QWaylandIntegration::initialize()
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{
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- QAbstractEventDispatcher *dispatcher = QGuiApplicationPrivate::eventDispatcher;
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- QObject::connect(dispatcher, SIGNAL(aboutToBlock()), mDisplay.data(), SLOT(flushRequests()));
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- QObject::connect(dispatcher, SIGNAL(awake()), mDisplay.data(), SLOT(flushRequests()));
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-
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int fd = wl_display_get_fd(mDisplay->wl_display());
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QSocketNotifier *sn = new QSocketNotifier(fd, QSocketNotifier::Read, mDisplay.data());
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QObject::connect(sn, SIGNAL(activated(QSocketDescriptor)), mDisplay.data(), SLOT(flushRequests()));
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@@ -203,6 +199,13 @@ void QWaylandIntegration::initialize()
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// Call after eventDispatcher is fully connected, for QWaylandDisplay::forceRoundTrip()
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mDisplay->initialize();
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+ // But the aboutToBlock() and awake() should be connected after initializePlatform().
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+ // Otherwise the connected flushRequests() may consumes up all events before processEvents starts to wait,
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+ // so that processEvents(QEventLoop::WaitForMoreEvents) may be blocked in the forceRoundTrip().
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+ QAbstractEventDispatcher *dispatcher = QGuiApplicationPrivate::eventDispatcher;
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+ QObject::connect(dispatcher, SIGNAL(aboutToBlock()), mDisplay.data(), SLOT(flushRequests()));
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+ QObject::connect(dispatcher, SIGNAL(awake()), mDisplay.data(), SLOT(flushRequests()));
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+
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// Qt does not support running with no screens
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mDisplay->ensureScreen();
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}
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--
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2.35.1
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