Re: [Chicken-hackers] [PATCH] Fix for #989 and hopefully #877 too

[Jörg F. Wittenberger]

Am 06.11.2013 15:29, schrieb Peter Bex:
> On Wed, Nov 06, 2013 at 03:21:18PM +0100, "Jörg F. Wittenberger" wrote:
> > My solution at that time was to coalesce signals by type and handle all
> > reasons of a particular signal in a single signal handler (anyway) since
> > - as you're pointing out - this must be done in any case.
> >
> > That's why it's actually enough to have a single int "signal_pending"
> > accumulate the signals in the "global_signal_handler" like this:
> >
> >    signal_pending |= 1 << signum;
> Maybe it's just me, but there are 256 signal handler slots.

Now I cam confused.

True, there are 256 possible signal handlers in ##sys#signal-vector
How could those be addressed/used at all?

>    The manpage for
> signal(7) on my NetBSD box shows 32 signals.  That means the pending signals
> won't ever fit in a fixnum on a 32-bit machine.

You're right: somehow it seems to have escaped me that attaching the 
type tag on the way from C to Scheme would reduce the number of bits 
avail.  (Otherwise I've been working from my "sure knowledge" that there 
are only 32 signals, which in turn would fit into a single word.)

/Jörg