From owner-cvs-all  Mon Mar 10 21:45:37 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 13:45:09 +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
OOPS, for this commit:=20
The original code will lose an userland context if current thread is
direct returning from syscall which was never blocked or UTS kernel
is doing syscall, at that time an upcall shouldn't be made.=20
TDF_UPCALLING was abused in that code.

> --=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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