https://bugs.kde.org/show_bug.cgi?id=384866
Bug ID: 384866
Summary: KDirWatch::addDir should pump the eventloop (call
QCoreApplication::processEvents())
Product: frameworks-kcoreaddons
Version: unspecified
Platform: Compiled Sources
OS: OS X
Status: UNCONFIRMED
Severity: wishlist
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: ---
Setting a dirwatcher on a large tree can be quite expensive on Mac. For
example, a recursive KDirWatch::addDir() on the GCC source tree will take
around 85 seconds on a 2.7Ghz i7 (with a fast HDD) while the KDirWatch dtor
will take roughly twice that time. Linux timings on a much slower CPU are a
fraction of that and negligible in probably most contexts where you'd want to
create such a dirwatcher.
I think this qualifies as the kind of lengthy operation for which Qt suggests
to call QCoreApplication::processEvents() periodically. That would make it less
invasive to call on the main thread, as applications (developed on Linux) might
be wont to do.
The logical place for doing such a check would be in
KDirWatchPrivate::addEntry(), just before the loop where it calls itself
recursively. That can however cause a race condition: how to handle the
situation where a user action leads to the destruction of the KDirWatch object
itself (e.g. the user quits the application during the lengthy dirwatcher
creation).
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