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Date: Fri, 4 Sep 2015 15:30:36 +0300
From: Konstantin Belousov <kostikbel@gmail.com>
To: Erich Dollansky <erichsfreebsdlist@alogt.com>
Cc: FreeBSD stable <freebsd-stable@freebsd.org>, freebsd-threads@freebsd.org
Subject: Re: pthread_cancel / sleep change in behaviour
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On Fri, Sep 04, 2015 at 04:35:24PM +0800, Erich Dollansky wrote:
> Hi,.
> 
> On Fri, 4 Sep 2015 11:18:57 +0300
> Konstantin Belousov <kostikbel@gmail.com> wrote:
> 
> > On Fri, Sep 04, 2015 at 08:37:40AM +0800, Erich Dollansky wrote:
> > > On Thu, 3 Sep 2015 13:43:51 +0300
> > > 
> > > and it works there.
> > > 
> > > So, it is just a matter of time until the fix finds its way back to
> > > 10?
> > Yes, should be several days timeframe.
> 
> this sounds perfect.
> > 
> > > 
> > > Of course, I do not ignore the signal now in the application
> > > anymore. The application then works as expected on 10.2 STABLE.
> > Well, the consequence of the bug, which affected you, is that it was
> > allowed for the applications to ignore SIGCANCEL. With the bug fixed,
> > the signal(SIGCANCEL, anything) becomes nop.
> 
> Was it just me being blind or is the documentation on this a bit
> limited?

Documentation on what ? SIGCANCEL is non-standard signal, it is not
documented because this is internal facility for the threading library.
Fiddling with anything without understanding the functionality is not
the best idea.