qt5base-lts/tests
Alex Trotsenko 81408c0e76 QEventDispatcherWin32: avoid livelock in a foreign event loop
According to Windows docs, GetMessage() function retrieves the messages
from the input queue in defined order, where posted messages are
processed ahead of input messages, even if they were posted later.
Therefore, if the application produces a posted event permanently, as
a result of processing that event, user input messages may be blocked
due to hard CPU usage by the application.

It's not a problem, if an internal Qt event loop is running. By calling
sendPostedEvents() on the beginning of processEvents(), we are sending
posted events only once per iteration. However, during execution of
the foreign loop, we should artificially lower the priority of the
WM_QT_SENDPOSTEDEVENTS message in order to enable delivery of other
input messages.

To solve the problem, it is proposed to postpone the
WM_QT_SENDPOSTEDEVENTS message until the message queue becomes empty,
as it works for the internal loop.

Task-number: QTBUG-77464
Change-Id: I8dedb6837c6fc41aa6f497e67ab2352c2b4f3772
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
2019-08-29 09:12:29 +00:00
..
auto QEventDispatcherWin32: avoid livelock in a foreign event loop 2019-08-29 09:12:29 +00:00
baselineserver Tests: Fix some warnings about deprecated functions not under test 2019-05-27 15:29:16 +02:00
benchmarks Merge remote-tracking branch 'origin/dev' into 5.14 2019-08-27 09:45:52 +02:00
global tst_bic: Add linux-gcc-ia32 bic data for QtXml 2013-01-16 08:25:28 +01:00
libfuzzer Harden ICC parser 2019-07-31 21:47:04 +02:00
manual rhi: vulkan: Introduce secondary command buffer usage 2019-08-29 10:23:15 +02:00
shared Remove usages of Q_OS_WINCE 2019-05-23 13:51:05 +02:00
testserver Share the common configurations among different modules 2019-07-01 01:09:42 +02:00
README Doc: Fix references to Qt Test 2013-01-30 01:35:06 +01:00
tests.pro Build examples and tests only if their requirements are met 2017-03-22 15:55:55 +00:00

This directory contains autotests and benchmarks based on Qt Test. In order
to run the autotests reliably, you need to configure a desktop to match the
test environment that these tests are written for.

Linux X11:

   * The user must be logged in to an active desktop; you can't run the
     autotests without a valid DISPLAY that allows X11 connections.

   * The tests are run against a KDE3 or KDE4 desktop.

   * Window manager uses "click to focus", and not "focus follows mouse". Many
     tests move the mouse cursor around and expect this to not affect focus
     and activation.

   * Disable "click to activate", i.e., when a window is opened, the window
     manager should automatically activate it (give it input focus) and not
     wait for the user to click the window.