Re: [Boost-users] [Thread] program crashes from time to time when deleting unique_future<void>

Subject: Re: [Boost-users] [Thread] program crashes from time to time when deleting unique_future<void>
From: Soderback, Johan (Johan.Soderback_at_[hidden])
Date: 2011-11-22 12:01:49

Thanx Alex,

It works but not when I have the boost::current_exception_diagnostic_information() call
in the throwf() as in my example.

void throwf()
{
  try
  {
    BOOST_THROW_EXCEPTION(TheException());
  }
  catch (...)
  {
    boost::current_exception_diagnostic_information();
    boost::rethrow_exception( boost::current_exception() ); // or just throw;
  }
}

The plain throw version seems to work as well without it, the call  certainly triggers something.
Anyway, any idea what could be wrong?

/Johan

-----Original Message-----
From: Alex Perry [mailto:Alex.Perry_at_[hidden]]
Sent: den 21 november 2011 21:34
To: Soderback, Johan
Cc: boost-users_at_[hidden]
Subject: RE: [Boost-users] [Thread] program crashes from time to time when deleting unique_future<void>

On Mon, 21 Nov 2011 16:40:04 +0000 "Soderback, Johan" <Johan.Soderback_at_[hidden]> wrote :-
> Hi,
>
> I have a small example program that crashes from time to time.
> I would appreciate some help to understand why.
>
> In function run() executed on the main thread I create a packaged_task (pt),
> put it in a queue (_q) and wait for it to get executed (fu.get()).
> In another thread the tasks are executed when the queue _q is populated.
> The task I'm running always throws/rethrows intentionally.
>
> It results (from time to time) in an access violation when the unique_future,
> fu, is deleted.
> See the stack trace at the bottom.
>
> Anybody see any flaws in this design?
>
> I have tried 1.47.0 and 1.48.0,  MSVC 2005.
>

Trying your example on vs2010 it crashes continuously - changing  your throwf() function to the following appears to sort it - not quite sure why a simple throw fails though - or whether this was your problem under vs2005

void throwf()
{
  try
  {
    BOOST_THROW_EXCEPTION(TheException());
  }
  catch (boost::exception const & )
  {
     boost::rethrow_exception( boost::current_exception() );
  }
}

HTH

Alex

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