[PATCH v3 3/5] Introduce _REENT_GLOBAL_STDIO_STREAMS

[Freddie Chopin]

On Fri, 2017-06-30 at 10:58 +0200, Sebastian Huber wrote:
> 
> ----- Am 30. Jun 2017 um 10:13 schrieb Corinna Vinschen 
> vinschen@redhat.com:
> 
> > On Jun 30 07:43, Sebastian Huber wrote:
> > > On 29/06/17 20:31, Corinna Vinschen wrote:
> > > 
> > > > And, JFYI, Cygwin will start to use it too after the next
> > > > release:)
> > > 
> > > There are some new problems with this change. We have no
> > > reference counting
> > > in the FILE objects, so a freopen(..., stdin), closes the global
> > > stdin FILE
> > > object (__sf[0]), etc. What works is a stdin = fopen(). I guess
> > > this could
> > > break existing applications.
> > 
> > Erm... isn't that expected behaviour?  stdin/stdout/stderr are
> > global
> > objects, after all.  They were never thread-local per POSIX.
> 
> The stdin/stdout/stderr pointers are still thread-local with this
> option. Only the FILE objects itself are now global. If you do a
> stdin = fopen() you get a completely thread-local stdin. I have
> absolutely no idea why this stuff is thread-local in Newlib by
> default.

Would that be possible, to make stdin/stdout/stderr completely global
(remove them from _reent, use global objects) when
_REENT_GLOBAL_STDIO_STREAMS is enabled?

Regards,
FCh