Re: [boost] Boost.Threads, N2178, N2184, et al

From: David Abrahams (dave_at_[hidden])
Date: 2007-03-27 14:08:01

on Tue Mar 27 2007, Alexander Terekhov <terekhov-AT-web.de> wrote:

> David Abrahams wrote:
> [...]
>> "Everybody" in the C++ community wants cancellation to be an ordinary,
>> stoppable, C++ exception, thrown only synchronously, at well-defined
>> cancellation points.  
>
> Or asynchronously from well-defined async-cancel-safe regions (ideally
> with async-cancel-safety of code inside async_cancel {} regions 
> statically checked by compiler).

Yes, given more C++ core language changes, async cancel safety could
be seen as viable under carefully controlled circumstances.

>>                      Anything else makes writing cancellation-safe
>> code basically untenable.  In fact, the only person I know of in *any*
>> community who insists that cancellation must be unstoppable is Ullrich
>> Drepper.
>
> Perhaps someone should try to explain to him that nobody really wants 
> to allow longjmp() from pthread_cleanup_push()'s handlers.

Be my guest Alexander; you're just the man for the job!

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com