Re: libstdc++, how to set gcc on a multithread environment ?

[Jose Luis Marchetti <joseluismarchetti at yahoo dot com dot br>]

Jonathan,

Thanks, so pretty much have to add -pthread option every time I see gcc in front of me.

José Luís Marchetti


--- Em ter, 28/7/09, Jonathan Wakely <jwakely.gcc@gmail.com> escreveu:

> De: Jonathan Wakely <jwakely.gcc@gmail.com>
> Assunto: Re: libstdc++, how to set gcc on a multithread environment ?
> Para: "Jose Luis Marchetti" <joseluismarchetti@yahoo.com.br>
> Cc: libstdc++@gcc.gnu.org
> Data: Terça-feira, 28 de Julho de 2009, 1:30
> 2009/7/27 Jose Luis Marchetti:
> >
> > I would like to safely run a multithread application
> that uses the libstdc++. -pthread option when invoking gcc
> is the only option I need to add ? Do I need this option at
> compiler time ?
> 
> Yes, at compile time *and* link time.
> > Exactly, also not clear for me as well.
> 
> The semantics of -pthread are perfectly clear to me, it was
> your
> question I didn't understand :-)
> 
> >> Depending on the platform, the -pthread option
> might affect
> >> the
> >> preprocessor, e.g. defining _REENTRANT, and that
> can affect
> >> the C
> >> library, and other libraries, so using -pthread
> can affect
> >> many
> >> things.
> >>
> >
> > When you say "defining _REENTRANT", that does not mean
> anything to me, I am a compiler user. As this subject is not
> clear for me, I would like to know ( or at least have some
> examples ) where the -pthread option makes difference.
> 
> I mean it has the effect of #define _REENTRANT, or using
> -D_REENTRANT
> on the command line.? Where that makes a difference
> depends on your
> platform and the libraries you're using.? If you don't
> understand the
> details, just do what the docs say and use -pthread when
> compiling and
> linking.
> 
> Jonathan
> 
> 
> >
> >> Jonathan
> >>
> >
> >
> >? ? ?
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