From owner-freebsd-threads@FreeBSD.ORG  Wed Jul 16 01:22:32 2003
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Date: Wed, 16 Jul 2003 04:22:03 -0400 (EDT)
From: Daniel Eischen <eischen@vigrid.com>
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To: David Schultz <das@freebsd.org>
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cc: Craig Rodrigues <rodrigc@crodrigues.org>
cc: David Xu <davidxu@freebsd.org>
cc: freebsd-threads@freebsd.org
Subject: Re: Threads regression tests (was: Re: ACE Proactor and libkse)
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On Tue, 15 Jul 2003, David Schultz wrote:

> On Wed, Jul 16, 2003, David Xu wrote:
> > Can you test my libkse patch ?
> > http://people.freebsd.org/~davidxu/libpthread_bound.diffs
> > If you can test the patch to make sure I don't break signal
> > code, then I will commit this patch. 
> 
> Is there interest in incrementally building a threads-related
> regression test suite in src/tools/regression?  This would mean
> less breakage for people who are trying to use KSE/libthr, and an
> easy way for threads developers to be somewhat confident that
> their changes are correct.  For example, two weeks ago I was
> tearing my hair out over a sigwait() problem that caused the
> following program to deadlock.  Since I already bothered to
> isolate the bug, why not do the last 1% of the work and check in a
> test so that it never comes back?  Thoughts?

That's why lib{c_r|pthread|thr}/test/ exists.

> #include <err.h>
> #include <signal.h>
> #include <stdlib.h>
> 
> int main() {
> 
> 	sigset_t mask;
> 	int sig;
> 
> 	sigemptyset(&mask);
> 	sigaddset(&mask, SIGALRM);
> 	if (sigprocmask(SIG_BLOCK, &mask, NULL) < 0)
> 		err(1, "sigprocmask");
> 
> 	if (raise(SIGALRM) < 0)
> 		err(1, "raise");
> 
> 	if (sigwait(&mask, &sig) < 0)
> 		err(1, "sigwait");
>         
> 	return (0);
> }

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.

-- 
Dan Eischen