Re: -D_REENTRANT
- From: Miroslaw Dobrzanski-Neumann <mne mosaic-ag com>
- To: gtk-devel-list gnome org
- Subject: Re: -D_REENTRANT
- Date: Thu, 14 Mar 2002 15:58:32 +0100
On Thu, Mar 14, 2002 at 03:45:47PM +0100, Sebastian Wilhelmi wrote:
> You have to compile libraries with some special options (either
> -D_REENTRANT or -DTHREAD_SAFE or sometimes -pthread) to make it use a
> thread safe errno (as the most important difference), the library still
> can be used singlethreaded at the users wish.
>
> > gcc: -pthread option
> > Sun Forte: -mt option
> > DEC C/CXX:
> > - dce threads: use -threads option
> > - posix (d7) threads: use -pthread option
> > IBM xlc/xlC family
> > - no threads: use xlc or xlC compiler
> > - dce threads: use xlc_r4 or xlC_r4
> > - posix (d7) threads: use xlc_r or / xlC_r
>
> So how do you compile thread safe libraries there (not link), which can
> be used single and multithreaded?
with the options -pthread/-mt or xlc_r for the four compiler above.
no -Dsomething no -lsomelib
mixing DCE and not DCE code can cause strange results (DCE changes semantic of
many system calls)
> > After Sun Forte / IBM xlc / DEC Manuals threading is the busines of the
> > compiler. So dirctly defining threading features as _REENTRANT or linking thread
> > or c libraries like -lc_r or -lpthread is not allowed and can cause serioius
> > problems.
>
> As said, there are two distinct problems:
>
> 1. Compile code, which can be potentially linked against
> multithreaded code, the flags for that have to be returned by
> `pkg-config --cflags gthread-2.0`
yes
> 2. Link code to the multithread libc (if different from the
> singlethreaded one) and to the native thread librray, the
> flags for that have to be returned by `pkg-config --libs
> gthread-2.0`
your right
Regards
--
Miroslaw Dobrzanski-Neumann
MOSAIC SOFTWARE AG
Base Development and Research
Tel +49-2225-882-291
Fax +49-2225-882-201
E-mail: mne mosaic-ag com
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