[Qt-interest] [1/2 OT] ImageMagick, OpenMP and QThread [Mac OS X]?

[Francisco Gonzalez]

2010/1/28 <Oliver.Knoll at comit.ch>

> Knoll Oliver, ITS-CMT-SUI-SL-SFR-FIN-DEV wrote on Thursday, January 28,
> 2010 10:32 AM:
>
> > ...
> > http://lists.apple.com/archives/coreaudio-api/2009/May/msg00035.html:
> >
> > "The gcc / OpenMP version that ships with Leopard/Xcode has a known
> > bug that it does not work on any thread other than the main thread.
> > This was apparently fixed on a later version of gcc, ...
>
> And for completeness sake, here is the corresponding
>
>  http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42616
>  "OMP'ed loop inside pthread leads to crash."
>
> Apparently this was reported against gcc 4.4.2, on "mingw32 on Windows XP"
> (so it is not just Mac OS X affected), "Last modified: 2010-01-22". And it
> is apparently not yet fixed.
>
> Maybe this issue /did/ work (apparently on my Ubuntu 8.10 with gcc 4.3.2),
> but now broke (again)? To be continued... :)
>
>
Just to add that your example works on Kubuntu 9.10 with gcc 4.4.1.
If someone wants to check with other gcc version there is a typo mistake
(not concerned with the problem explained)
" #pragma omp parallel {"
should be
" #pragma omp parallel
{"

Francisco


>
> Cheers, Oliver
> --
> Oliver Knoll
> Dipl. Informatik-Ing. ETH
> COMIT AG - ++41 79 520 95 22
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