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Re: [3.3] Followup to C++ forced unwinding
- From: Richard Henderson <rth at redhat dot com>
- To: Nathan Myers <ncm at cantrip dot org>
- Cc: Ulrich Drepper <drepper at redhat dot com>, Mark Mitchell <mark at codesourcery dot com>, gcc-patches at gcc dot gnu dot org, jason at redhat dot com
- Date: Wed, 30 Apr 2003 17:17:59 -0700
- Subject: Re: [3.3] Followup to C++ forced unwinding
- References: <20030430175335.GA18958@twiddle.net> <email@example.com> <20030430210342.GB697@redhat.com> <firstname.lastname@example.org> <20030430230239.GH697@redhat.com> <3EB05952.email@example.com> <20030430235053.GR19185@tofu.dreamhost.com>
On Wed, Apr 30, 2003 at 04:50:53PM -0700, Nathan Myers wrote:
> Any thread can prevent cancellation by putting "while (true);" in
> a destructor. Once control leaves the catch block, the thread can't
> do any more externally visible work anyway, because that would touch
> another cancellation point, which (I assume) would throw again.
Yeah, but you have to work at it to not cancel the thread
(via exit or longjmp or infinite loop) from a destructor,
whereas it's easy to forget to rethrow inside a catch(...).
Thus, IMO destructors should be preferred over catch(...)
for *all* cleanup operations, not just for this cancellation