On Thursday 26 February 2015 08:43:11 Koehne Kai wrote: > > -----Original Message----- > > From: interest-bounces+kai.koehne=theqtcompany....@qt-project.org > > [mailto:interest-bounces+kai.koehne=theqtcompany....@qt-project.org] > > On Behalf Of Frank Hemer > > Sent: Wednesday, February 25, 2015 5:24 PM > > To: interest@qt-project.org > > Subject: Re: [Interest] QSettings stale lock file > > > > On Wednesday 25 February 2015 07:25:41 Thiago Macieira wrote: > > > On Wednesday 25 February 2015 11:30:57 Frank Hemer wrote: > > > > On a windows7 professional, I'm using QSettings for the local user - > > > > the settings data is located on a roaming profile. > > > > Now I experience stale lock files xxx.ini.lock (zero bytes) that > > > > crash my application. > > > > > > > > There is no other process running that could access the qsettings! > > > > > > > > Can anyone shed some light on conditions that could cause this? > > > > > > I think you're confusing cause with consequence. The lock files don't > > > cause the crash; the crash is the cause for the files existing: the > > > process stopped before the lock file could be removed. > > > > well - I should have explained in more detail. > > I was asking for the cause of the lock files to appear ... in many years I > > have never seen these (well, prob. bec. they are created and removed in > > some msecs). And looking at the code I expected to find some processID > > written there, but the size was zero. > > The reason is that QSettings since Qt 5.4 use QSaveFile to write, which in > turn uses QLockFile. > > See also the 5.4.0 change log: > > * [QTBUG-21739] The locking mechanism inside QSettings has changed > and is no longer compatible with the one of previous versions of > Qt. There might be corruption if two applications running different > versions of Qt are writing to the same config file at the same > time. You must also now have write permissions in the directory > containing the settings file in order to write settings.
Hmm - yes, that explains the appearance of lock files. But it does not explain the zero size. Frank _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
