From: Matt Austern <austern@apple.com>
To: Jason Merrill <jason@redhat.com>
Cc: Stan Shebs <shebs@apple.com>, Aldy Hernandez <aldyh@redhat.com>,
rth@redhat.com, gcc-patches@gcc.gnu.org, jakub@redhat.com
Subject: Re: [basic-improvements] try/finally support for c/c++
Date: Tue, 05 Nov 2002 19:25:00 -0000 [thread overview]
Message-ID: <5FB32E42-F137-11D6-946D-000393B2ABA2@apple.com> (raw)
In-Reply-To: <wvl3cqf7avy.fsf@prospero.boston.redhat.com>
On Tuesday, November 5, 2002, at 05:19 PM, Jason Merrill wrote:
> I believe that the purpose of this stuff is to handle pthread cleanups
> using EH so that we can implement thread cancellation using EH. Matt,
> you
> may remember discussing this strategy at the ABI meetings (it gave
> rise to
> the forced_unwind stuff).
Thanks for the explanation, Jason. Yes, I can see that
motivation.
I'm still not 100% sure that I find it completely compelling,
though. Yes, I do remember the forced unwind stuff, but that
started from the question of how thread cancellation would
interact with automatic variables' destructors, which is, um,
less of a concern for C.
I also have to wonder if there's a less drastic solution for
implementing thread cancellation than making a major language
extension. After all, pthreads was designed and implemented
with standard C90 in mind; do we really need this sort of
language change either to implement pthread_cancel or for
programmers to be able to use it effectively? If this is the
motivation, I think there may be a mismatch between the scope
of the problem and the scope of the solution.
(One thing I've learned since the ABI discussions, by the way,
is that asynchronous cancelation with pthread_cancel was only
designed for some extremely specialized cases; pthreads experts
advise against using it in general. Take a look at what Dave
Butenhof writes, for example.)
--Matt
next prev parent reply other threads:[~2002-11-06 3:25 UTC|newest]
Thread overview: 128+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-11-05 15:16 Aldy Hernandez
2002-11-05 15:57 ` Richard Henderson
2002-11-05 23:03 ` Aldy Hernandez
2002-11-06 0:44 ` Joseph S. Myers
2002-11-06 0:52 ` Jakub Jelinek
2002-11-06 3:02 ` Michael Matz
2002-11-06 3:11 ` Jakub Jelinek
2002-11-06 4:16 ` Michael Matz
2002-11-06 10:29 ` Aldy Hernandez
2002-11-06 10:53 ` Richard Henderson
2002-11-06 10:56 ` Aldy Hernandez
2002-11-06 11:24 ` Joseph S. Myers
2002-11-06 13:49 ` Richard Henderson
2002-11-06 17:45 ` Fergus Henderson
2002-11-07 9:54 ` Richard Henderson
2002-11-06 17:48 ` Fergus Henderson
2002-11-07 9:58 ` Richard Henderson
2002-11-06 11:22 ` Joseph S. Myers
2002-11-06 14:00 ` Richard Henderson
2002-11-06 17:21 ` Fergus Henderson
2002-11-06 4:20 ` Gabriel Dos Reis
2002-11-06 9:05 ` Aldy Hernandez
2002-11-06 9:11 ` Matt Austern
2002-11-06 9:25 ` Gabriel Dos Reis
2002-11-06 11:15 ` Richard Henderson
2002-11-07 0:09 ` Kai Henningsen
2002-11-07 12:56 ` Richard Henderson
2002-11-06 6:05 ` Jason Merrill
2002-11-06 10:56 ` Richard Henderson
2002-11-06 12:14 ` Jason Merrill
2002-11-05 16:40 ` Stan Shebs
2002-11-05 16:48 ` Matt Austern
2002-11-05 17:21 ` Jason Merrill
2002-11-05 19:25 ` Matt Austern [this message]
2002-11-06 10:25 ` Richard Henderson
2002-11-06 11:05 ` Mike Stump
2002-11-05 21:20 ` Aldy Hernandez
2002-11-06 9:43 ` [basic-improvements] try/finally support for c/c++ - more tests Jakub Jelinek
2002-11-06 11:04 ` Joseph S. Myers
2002-11-06 15:34 ` Mark Mitchell
2002-11-06 16:03 ` Richard Henderson
2002-11-06 16:10 ` Gabriel Dos Reis
2002-11-06 16:12 ` Richard Henderson
2002-11-06 16:20 ` Gabriel Dos Reis
2002-11-06 17:02 ` Per Bothner
2002-11-06 17:14 ` Gabriel Dos Reis
2002-11-06 16:47 ` Mark Mitchell
2002-11-06 16:54 ` Matt Austern
2002-11-06 18:00 ` Zack Weinberg
2002-11-06 18:14 ` Gabriel Dos Reis
2002-11-06 18:58 ` Zack Weinberg
2002-11-06 19:33 ` Gabriel Dos Reis
2002-11-06 22:15 ` Zack Weinberg
2002-11-06 22:37 ` Mark Mitchell
2002-11-06 23:30 ` Aldy Hernandez
2002-11-07 1:03 ` Gabriel Dos Reis
2002-11-07 5:34 ` Michael Matz
2002-11-07 8:14 ` Mark Mitchell
2002-11-07 8:37 ` Daniel Jacobowitz
2002-11-07 9:09 ` Mark Mitchell
2002-11-07 9:19 ` Daniel Jacobowitz
2002-11-07 9:53 ` Mark Mitchell
2002-11-07 9:57 ` Matt Austern
2002-11-07 10:43 ` Jason Merrill
2002-11-07 8:44 ` Jakub Jelinek
2002-11-07 12:18 ` Geoff Keating
2002-11-07 12:24 ` Daniel Jacobowitz
2002-11-07 12:32 ` Mark Mitchell
2002-11-07 13:41 ` Geoff Keating
2002-11-07 14:06 ` Mark Mitchell
2002-11-07 14:39 ` Richard Henderson
2002-11-07 14:53 ` Mark Mitchell
2002-11-07 15:14 ` Geoff Keating
2002-11-07 15:37 ` Mark Mitchell
2002-11-08 11:30 ` Geoff Keating
2002-11-07 15:45 ` Richard Henderson
2002-11-07 16:21 ` Mark Mitchell
2002-11-07 16:44 ` aldyh
2002-11-07 17:06 ` Richard Henderson
2002-11-07 17:10 ` Jakub Jelinek
2002-11-07 17:29 ` Mark Mitchell
2002-11-07 17:43 ` Richard Henderson
2002-11-07 17:55 ` Mark Mitchell
2002-11-07 17:52 ` Jason Merrill
2002-11-07 17:57 ` Mark Mitchell
2002-11-07 18:17 ` Zack Weinberg
2002-11-07 18:29 ` Mark Mitchell
2002-11-07 21:23 ` Robert Lipe
2002-11-07 21:32 ` Jason Merrill
2002-11-08 4:48 ` Nicola Pero
2002-11-08 5:47 ` Jakub Jelinek
2002-11-08 10:02 ` Fergus Henderson
2002-11-08 11:24 ` Kai Henningsen
2002-11-08 11:44 ` Jakub Jelinek
2002-11-09 0:11 ` Fergus Henderson
2002-11-08 11:46 ` Mike Stump
2002-11-08 10:02 ` Matt Austern
2002-11-11 5:38 ` Michael Matz
2002-11-11 12:59 ` Matt Austern
2002-11-12 1:01 ` Michael Matz
2002-11-12 8:20 ` Mark Mitchell
2002-11-12 8:58 ` Michael Matz
2002-11-07 19:28 ` Daniel Jacobowitz
2002-11-07 22:07 ` Alexandre Oliva
2002-11-08 4:27 ` Richard Henderson
2002-11-08 4:54 ` Jakub Jelinek
2002-11-08 6:01 ` Jakub Jelinek
2002-11-08 11:38 ` Mike Stump
2002-11-08 11:25 ` Mike Stump
2002-11-08 9:31 ` Michael Matz
2002-11-08 11:26 ` Hans-Peter Nilsson
2002-11-08 11:48 ` Mike Stump
2002-11-07 11:38 ` Zack Weinberg
2002-11-07 9:38 ` Mike Stump
2002-11-07 10:06 ` Richard Henderson
2002-11-07 12:57 ` Hans-Peter Nilsson
2002-11-06 17:58 ` Fergus Henderson
2002-11-06 18:09 ` Fergus Henderson
2002-11-07 0:30 ` Jakub Jelinek
2002-11-06 18:34 ` Geoff Keating
2002-11-07 3:29 ` Fergus Henderson
2002-11-07 4:22 ` Jakub Jelinek
2002-11-07 5:13 ` Fergus Henderson
2002-11-07 5:47 ` Michael Matz
2002-11-07 8:52 ` Aldy Hernandez
2002-11-07 10:00 ` Mike Stump
2002-11-07 12:36 ` Alexandre Oliva
2002-11-07 13:06 ` Aldy Hernandez
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