[Interest] QFileSystemWatcher malfunctioning

[Atlant Schmidt]

All:

> With this class you just do this:
>
> {
>     SignalBlocker blocker(watcher);
>     modifyTheFile();
> }

  It seems to me that there's a race condition here.
  Unless you're taking steps to deliberately lock-out
  other processes from modifying the file, then they
  could slip in immediately before or after you modify
  the file and you would never know they'd been there
  because you have the signal blocked.

  A later reply talks about hashing the file; if you
  really want precision notification of modifications,
  then that's the sort of thing you have to do *EVERY
  TIME* the file watcher tells you a modification has
  been made, even if you suspect that the modification
  was your own. Either that, or lock-out other changers
  while you make your change.

                                   Atlant

-----Original Message-----
From: interest-bounces+aschmidt=dekaresearch.com at qt-project.org [mailto:interest-bounces+aschmidt=dekaresearch.com at qt-project.org] On Behalf Of André Somers
Sent: Thursday, January 12, 2012 03:27
To: interest at qt-project.org
Subject: Re: [Interest] QFileSystemWatcher malfunctioning

Op 12-1-2012 9:14, Bo Thorsen schreef:
> I just put my SignalBlocker implementation on my blog:
>
> http://www.fioniasoftware.dk/blog/?p=158
>
> (Sorry for the plug but it was a bit long for a mail, and there might be
> other interested in it.)
>
> With this class you just do this:
>
> {
>     SignalBlocker blocker(watcher);
>     modifyTheFile();
> }
>
> I hope this helps.
>
Funny, I wrote exactly the same class (ok, named slightly differently)
at work just a month ago or so :-)

André

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