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Subject:	Re: Cygwin 3.6: Supporting 128 POSIX realtime (SIGRTMAX-SIGRTMIN >=
	128) signals?
To:	cygwin AT cygwin DOT com
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From:	Lionel Cons via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Lionel Cons <lionelcons1972 AT gmail DOT com>
Sender:	"Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>

On Tue, 4 Mar 2025 at 11:08, Corinna Vinschen via Cygwin
<cygwin AT cygwin DOT com> wrote:
>
> On Mar  3 23:07, Lionel Cons via Cygwin wrote:
> > On Mon, 3 Mar 2025 at 12:43, Corinna Vinschen via Cygwin
> > <cygwin AT cygwin DOT com> wrote:
> > >
> > > On Feb 28 15:36, Lionel Cons via Cygwin wrote:
> > > > We've hit a scalability issue in Cygwin today, the application in
> > > > question ran out of POSIX realtime signals (i.e. SIGRTMIN-SIGRTMAX).
> > > >
> > > > Could Cygwin support 128 POSIX realtime signals?
> > >
> > > Not possible.  sigset_t is an unsigned long, thus we can only support
> > > up to 64 signals.
> > >
> > > A change to a bigger sigset_t is an ABI breakage and requires two
> > > different entry points for all functions touching the sigset_t type, one
> > > for the new definition of sigset_t, one for backward compatibility with
> > > existing applications.  This *could* be part of 3.7, but I don't make
> > > any promises.
> >
> > gcc has int128_t - would that help you?
>
> Not at all.  It doesn't change the underlying problem of the ABI breakage.

That is... bad.
For the new ABI, maybe store a pointer to the byte array which holds
the signal bits, and the array has a size prefix, so it can be
extended on demand? Public functions only use pointer+size then...

Lionel

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