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Subject: Re: Cygwin 3.6: Supporting 128 POSIX realtime (SIGRTMAX-SIGRTMIN >=
 128) signals?
To: cygwin AT cygwin DOT com
Cc: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
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From: Lionel Cons via Cygwin <cygwin AT cygwin DOT com>
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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?

Lionel

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