Re: [boost] On boost.config

From: Peter Dimov (pdimov_at_[hidden])
Date: 2001-09-24 14:52:16

From: "William Kempf" <williamkempf_at_[hidden]>
> It's correct as written.  The macro BOOST_DISABLE_THREADS is used to
disable
> Boost thread support even if the config stuff detects that thread support
is
> enabled for the compiler/platform.

(cc: to the list)

Look at the context:

//
// Turn on threading support if the compiler thinks that it's in
// multithreaded mode.  We put this here because there are only a
// limited number of macros that identify this (if there's any missing
// from here then add to the appropriate compiler section):
//
#if (defined(__MT__) || defined(_MT) || defined(_REENTRANT) \
    || defined(_PTHREADS)) && !defined(BOOST_DISABLE_THREADS)
#  define BOOST_HAS_THREADS
#endif

//
// Turn threading support off if BOOST_DISABLE_THREADS is defined:
//
#if defined(BOOST_DISABLE_THREADS) && defined(BOOST_HAS_THREADS)
#  undef BOOST_HAS_THREADS
#endif

--
BOOST_DISABLE_THREADS is handled separately by the second block; if
BOOST_HAS_THREADS is already defined (the first comment implies that this is
possible) the first #define causes a redefinition.
At least this is my understanding of it.
----- Original Message -----
From: "William Kempf" <williamkempf_at_[hidden]>
To: <bdawes_at_[hidden]>; <pdimov_at_[hidden]>
Sent: Monday, September 24, 2001 20:51
Subject: Re: [boost] On boost.config
> It's correct as written.  The macro BOOST_DISABLE_THREADS is used to
disable
> Boost thread support even if the config stuff detects that thread support
is
> enabled for the compiler/platform.
>
> Bill Kempf
> williamkempf_at_[hidden]
>
>
>
> >From: Beman Dawes <bdawes_at_[hidden]>
> >To: "Peter Dimov" <pdimov_at_[hidden]>
> >CC: William Kempf <williamkempf_at_[hidden]>
> >Subject: Re: [boost] On boost.config
> >Date: Mon, 24 Sep 2001 11:37:54 -0400
> >
> >Peter,
> >
> > >* Shouldn't !defined(BOOST_DISABLE_THREADS) below
> > >
> > >#if (defined(__MT__) || defined(_MT) || defined(_REENTRANT) \
> > >    || defined(_PTHREADS)) && !defined(BOOST_DISABLE_THREADS)
> > >#  define BOOST_HAS_THREADS
> > >#endif
> > >
> > >be !defined(BOOST_HAS_THREADS)?
> > >
> > >I can (try to) fix the above if there are no objections.
> >
> >I'm not sure about the last one.  I think it may be correct as written.
> >
> >You might want to get the OK from John Maddock or Bill Kempf before you
> >make the change.
> >
> >--Beman
> >
>
>
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