From owner-cvs-all  Mon Mar 10 21:33:23 2003
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From: "David Xu" <davidxu@viatech.com.cn>
To: "Alfred Perlstein" <bright@mu.org>
Cc: <src-committers@FreeBSD.org>, <cvs-src@FreeBSD.org>,
	<cvs-all@FreeBSD.org>
References: <200303110259.h2B2xor5078625@repoman.freebsd.org> <20030311051206.GZ4145@elvis.mu.org>
Subject: Re: cvs commit: src/sys/kern kern_thread.c subr_trap.c
Date: Tue, 11 Mar 2003 13:33:15 +0800
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----- Original Message -----=20
From: "Alfred Perlstein" <bright@mu.org>
To: "David Xu" <davidxu@FreeBSD.org>
Cc: <src-committers@FreeBSD.org>; <cvs-src@FreeBSD.org>; =
<cvs-all@FreeBSD.org>
Sent: Tuesday, March 11, 2003 1:12 PM
Subject: Re: cvs commit: src/sys/kern kern_thread.c subr_trap.c


> * David Xu <davidxu@FreeBSD.org> [030310 18:59] wrote:
> > davidxu     2003/03/10 18:59:50 PST
> >=20
> >   FreeBSD src repository
> >=20
> >   Modified files:
> >     sys/kern             kern_thread.c subr_trap.c=20
> >   Log:
> >   Fix signal delivering bug for threaded process.
>=20
> Details, while not manditory are encouraged.  See a typical
> commit by Dr. Mckusick.
>=20
Orignal code would suspend an already suspended thread,
if user presses ^Z while a threaded program is running. Also
there is a race between job control and thread_exit(),  the=20
new code tests job control requesting before thread exits,
in wait() syscall, be sure to check process is fully stopped
before parent proc thinks child was stopped,  this avoids
a later SIGCHILD and returns STOPPED status twice
for a threaded child proc.

> --=20
> -Alfred Perlstein [alfred@freebsd.org]
> 'Instead of asking why a piece of software is using "1970s =
technology,"
>  start asking why software is ignoring 30 years of accumulated =
wisdom.'



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