[Interest] QFileSystemWatcher malfunctioning

[Sujan Dasmahapatra]

* SignalBlocker blocker(plotgraphsdlg->watcher);**** //blocking the signal*

 Is the above code is sufficient to block the signal ????

On Fri, Feb 3, 2012 at 5:34 AM, Scott Aron Bloom
<Scott.Bloom at onshorecs.com>wrote:

> I have found with windows at least, its instantaneous.  Essentially it
> sets up a blocking win32 call, that gets release and emits the signal...
>
> But it does take the event loop of the connected slots thread to be
> running...
>
> Scott
>
> -----Original Message-----
> From: interest-bounces+scott.bloom=onshorecs.com at qt-project.org
> [mailto:interest-bounces+scott.bloom=onshorecs.com at qt-project.org] On
> Behalf Of Andreas Pakulat
> Sent: Thursday, February 02, 2012 3:54 PM
> To: interest at qt-project.org
> Subject: Re: [Interest] QFileSystemWatcher malfunctioning
>
> On 02.02.12 15:23:53, Scott Aron Bloom wrote:
> > QFileSystemWatcher DOES operate in a separate thread 100% certainly
> > for windows, 99% for linux..
> >
> > Its been a while since I looked at the insides on linux.
>
> All engines run in a separate thread and some of the engines have
> multiple threads themselves again (win32 and dnotify) as far as I can
> see from a quick grep.
>
> However these threads could be delivering their signals directly instead
> of delivering them through the event-queue, so there is actually a way
> that the blocker really blocks signals.
>
> But if the used backend is actually not triggered by the OS directly
> when a filesystem change happens, i.e. if it takes a few ms for the OS
> to notify the watcher (and thats definetly the case for the polling
> backend) then signal blocking will not work.
>
> Andreas
>
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-- 
Thanks & Regards
Sujan Dasmahapatra
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