[cpp-threads] Re: Exception propogation across threads

[Meredith, Alisdair]

> -----Original Message-----
> From: cpp-threads-bounces at decadentplace.org.uk [mailto:cpp-threads-
> bounces at decadentplace.org.uk] On Behalf Of Boehm, Hans
> Sent: 21 February 2007 20:09
> To: C++ threads standardisation; c++std-ext at accu.org
> Subject: RE: [cpp-threads] Re: Exception propogation across threads

> My recollection from the last discussion is that this has the
(probably
> fatal?) flaw that the join may not be executed until next month.  Thus
> you could effectively be hiding the exception for a month.  Since it
> escaped the thread, it was presumably not completely handled, so we
are
> now letting the application run in a bad state for a month,
potentially
> wreaking all sorts of havoc.

And to state the obvious, even this may be optimistic with detached
threads ...

But if the default behaviour is to abort, should we still offer a
facility to transfer exceptions on a join under the user control.

Effectively support for:

void thread_func()
{
  try
  {
  // Do some real work
  }
  catch( ... )
  {
  // Attempt any meaningful recory
  //
  // --> tricky bit <--
  // now transfer the caught exception into
  // a place to propagate on join
  // (Tricky as we have no name for exception object or type)
  }
}

There were two papers in the post-Portland mailing that came up with a
mechanism here, and Dave Abrahams suggested an even cleaner scheme at
the meeting itself.

(links to save looking them up)
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n2106.html
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n2107.html

AlisdairM
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