[RFC] Use QFileSystemWatcher as another method for KDirWatch?

Christian Ehrlicher Ch.Ehrlicher at gmx.de
Thu Dec 6 05:32:15 GMT 2007

David Faure schrieb:
> On Wednesday 05 December 2007, Andreas Pakulat wrote:
>> On 05.12.07 23:11:53, Christian Ehrlicher wrote:
>>> Andreas Pakulat schrieb:
>>>> On 05.12.07 20:24:27, Christian Ehrlicher wrote:
>>>>> Christian Ehrlicher schrieb:
>>>>>> Hi,
>>>>>> Using kdirwatch on windows is very cpu consuming (kded sometimes use 40% cpu on my duron 1300). Therefore I want to implement QFileSystemWatcher as an optional method. Is there a reason why this should not work? Should it be an optional or a hard dependency?
>>>>> Ok, here the patch.
>>>>> I enabled it only for windows to not get in trouble with 4.0.0. There's
>>>>> a bug (task-tracker id 170021) which prevents watching directories on a
>>>>> fat32 partition. It's fixed in 4.4 but it would be nice when this patch
>>>>> could be applied to qt-copy.
>>>> Does this support all features of KDirWatch? Last time I checked
>>>> QFSWatcher had some limitations.
>>> There's one major difference between KDirWatch and QFileSystemWatcher.
>>> KDirWatch can watch files/dirs which do not exist yet.
>>> Any other difference you're aware of?
>> No, and now that you mention it, I think thats exactly what I was
>> thinking about. I'm not sure though how much that feature is used...
> I think it's quite necessary in kded, which has to notice directories created
> in the usual places (e.g. $KDEHOME/share/services). But I guess this can always
> be emulated by watching the parent dir instead - at the expense of making the
> code more complex.
With my patch this works too (just copied the relevant parts from
KDirWatch/inotify - support)
Looks like inotify can't watch non existant files/dirs at all.


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