Op 9 mei 2012 21:30 schreef "K. Frank" <[email protected]> het volgende:
>
> Hi Gaby!
>
> On Wed, May 9, 2012 at 3:08 PM, Gabriel Dos Reis
> <[email protected]> wrote:
> > On Wed, May 9, 2012 at 2:06 PM, K. Frank <[email protected]> wrote:
> >
> >> However, as noted in my previous post, I have happily done some
> >> (limited) windows-api threading programming with Ruben's build
> >> (and also did the windows-api threading programming necessary
> >> to implement <thread>), all, I guess, with a gcc build built using
> >> --enable-threads=posix, so what then does --enable-threads=win32
> >> actually do?
> >
> > See TDM's build (which is --enable-threads=win32)
>
> I've used a couple of TDM's builds in the past (but I'm not sure I
> ever used it with threading, unless maybe a few simple test
> programs with Qt's QThread, and such). But I haven't noticed
> any difference (other than, I would suspect, pthreads not working).
>
> So what does --enable-threads=win32 vs. --enable-threads=posix
> actually do?
It sets the source files that implement libgcc's internal thread functions.
Libstdc++ piggy-backs on these functions. Libgomp really needs a pthreads
api. There is a necessary part of the gthread Ali unimplemented for win32,
which results in the thread stuff being disabled in that case.
What you call in your code is completely orthogonal to GCC's threading
model, although libgcc will depend on the underlying winpthreads wrapper,
hence the dependency and performance penalty in *all* code.
Qthread, boost.thread all work regardless of what GCC uses internally.
Ruben
>
> > -- Gaby
>
> Thanks.
>
>
> K. Frank
>
>
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