Re: [boost] Re: Basic guarantee and synchronized multiple updates.

From: Victor A. Wagner, Jr. (vawjr_at_[hidden])
Date: 2002-10-04 11:16:18

At Friday 2002/09/27 06:59, you wrote:
>< apropos "synchronized" -- i.e. multithreading ;-) >
>
>David Abrahams wrote:
>[...]
> >     {
> >         vector1.push_back(e1);
> >         try {
> >             vector2.push_back(e2):
> >         }
> >         catch(...) {
> >             vector1.pop_back();
> >             throw;
> >         }
> >     }
> >
> > And now you have not only the basic, but the strong guarantee (unless...
>
>unless the entire thread running vector2.push_back(e2) gets >>canceled<<
>hitting some cancellation point or async-cancel region... on "some"
>C/*C++* implementation that DOESN'T invoke catch(...) handlers on thread
>cancellation (or exit)... and this IS "industry practice" (AIX, Solaris,
>pthreads-win32/non-VCE, probably z/OS, etc.), nowadays, BTW. ;-) ;-)

which, of course, means you can never do exception safe things in such an os

>regards,
>alexander.
>
>
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Victor A. Wagner Jr.      http://rudbek.com
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