https://bugs.kde.org/show_bug.cgi?id=471941
Bug ID: 471941
Summary: KJob dtor force-quits applications
Classification: Frameworks and Libraries
Product: frameworks-kcoreaddons
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: mp...@kde.org
Reporter: sit...@kde.org
CC: kdelibs-b...@kde.org
Target Milestone: ---
Created attachment 160072
--> https://bugs.kde.org/attachment.cgi?id=160072&action=edit
example source
SUMMARY
KJobPrivate has
// eventLoopLocker prevents QCoreApplication from exiting when the last
// window is closed until the job has finished running
QEventLoopLocker eventLoopLocker;
The way this works is that each QEventLoopLocker has a refcount in the
QCoreApplication, when the counter hits zero the application quits. That means
when all kjobs are destroyed the application always quits - regardless of
whether it was meant to!
I'm going to attach a trivial example.
For QGuiApplications this is additionally contingent on its
quitOnLastWindowClosed property, but when that is set to false the call chain
falls back into QCoreApplication and behaves exactly the same. Put another way:
you cannot use KJobs and QGuiApplications that are meant **not** to quit
because running out of KJobs always force quits the application.
I'm not quite sure what the fix here should be. Maybe install an eventfilter on
the QCoreApplication and only install the lockers on QEvent::Quit?
Alternatively we could bounce this to Qt since this behavior arguably makes
QEventLoopLocker only niche-useful. Someone probably needs to track whether
quit was actually called on the application though.
SOFTWARE/OS VERSIONS
Operating System: KDE neon Unstable Edition
KDE Plasma Version: 5.27.80
KDE Frameworks Version: 5.240.0
Qt Version: 6.5.1
Kernel Version: 5.19.0-42-generic (64-bit)
Graphics Platform: offscreen
Processors: 12 × AMD Ryzen 5 3600X 6-Core Processor
Memory: 31.3 GiB of RAM
Graphics Processor: AMD Radeon RX 5700 XT
ADDITIONAL INFORMATION
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