Re: [PATCH v3 3/5] Introduce _REENT_GLOBAL_STDIO_STREAMS

[Sebastian Huber <sebastian dot huber at embedded-brains dot de>]

On 08/08/18 15:19, Freddie Chopin wrote:
> 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?

The thread-local IO streams are a Newlib feature that is used by our 
applications.

--
Sebastian Huber, embedded brains GmbH

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