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From: "David Xu" <davidxu@freebsd.org>
To: <deischen@freebsd.org>, "David Schultz" <das@freebsd.org>
References: <Pine.GSO.4.10.10307160407570.12570-100000@pcnet5.pcnet.com>
Date: Wed, 16 Jul 2003 16:46:06 +0800
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cc: Craig Rodrigues <rodrigc@crodrigues.org>
cc: freebsd-threads@freebsd.org
Subject: Re: Threads regression tests (was: Re: ACE Proactor and libkse)
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----- Original Message -----=20
From: "Daniel Eischen" <eischen@vigrid.com>
To: "David Schultz" <das@freebsd.org>
Cc: "Craig Rodrigues" <rodrigc@crodrigues.org>; "David Xu" =
<davidxu@freebsd.org>; <freebsd-threads@freebsd.org>
Sent: Wednesday, July 16, 2003 4:22 PM
Subject: Re: Threads regression tests (was: Re: ACE Proactor and libkse)


> That's why lib{c_r|pthread|thr}/test/ exists.
>=20
> > #include <err.h>
> > #include <signal.h>
> > #include <stdlib.h>
> >=20
> > int main() {
> >=20
> > sigset_t mask;
> > int sig;
> >=20
> > sigemptyset(&mask);
> > sigaddset(&mask, SIGALRM);
> > if (sigprocmask(SIG_BLOCK, &mask, NULL) < 0)
> > err(1, "sigprocmask");
> >=20
> > if (raise(SIGALRM) < 0)
> > err(1, "raise");
> >=20
> > if (sigwait(&mask, &sig) < 0)
> > err(1, "sigwait");
> >        =20
> > return (0);
> > }
>=20
> This seems to be kernel bug (if it is a bug).  If you build
> it without linking any of the threads libraries it still
> exits the program without sigwait receiving the signal.
>=20

Yes, kern_sig.c's kern_sigtimedwait has bug, it shouldn't
terminate process. However libkse current relies on this bug,
unless I extend kse_thr_interrupt, fixing this bug would break
libkse. I have already worked out a patch for kse_thr_interrupt,
so when UTS receives a signal and finds that signal action is
SIG_DFL, it would call kse_thr_interrupt to terminate process
with signal, and possible core dumps itself.
Coming commit will fix libkse to not rely on this bug.

> --=20
> Dan Eischen
>=20
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