[PATCH] [RTEMS] Update RTEMS thread model

[Sebastian Huber]

On 02/09/15 13:32, Daniel Gutson wrote:
>
>
> El 2/9/2015 5:28, "Sebastian Huber" 
> <sebastian.huber at embedded-brains.de 
> <mailto:sebastian.huber at embedded-brains.de>> escribió:
> >
> >
> >
> > On 02/09/15 02:50, Chris Johns wrote:
> >>
> >> On 1/09/2015 8:52 pm, Daniel Gutson wrote:
> >>>
> >>> >
> >>> >El 31/7/2015 3:28, "Chris Johns" <chrisj at rtems.org 
> <mailto:chrisj at rtems.org>
> >>> ><mailto:chrisj at rtems.org <mailto:chrisj at rtems.org>>> escribió:
> >>>>
> >>>> >>
> >>>> >>On 31/07/2015 4:11 pm, Sebastian Huber wrote:
> >>>>>
> >>>>> >> >For synchronization objects use the self-contained objects 
> available via
> >>>>> >> >Newlib <sys/lock.h>.
> >>>>> >> >
> >>>>> >> >
> >>>
> >>> 
> >https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;a=commit;h=ecaef05f6601f1e8acb78fb65b411a258f39988a
> >>>>>
> >>>>> >> >
> >>>>> >> >Enable the C++11 threads using <pthread.h>.  So, the threads 
> are only
> >>>>> >> >supported in case the POSIX API is enabled in RTEMS.  In the 
> long run
> >>>>> >> >support for thread join and detach should be added to the API
> >>>>> >> >independent RTEMS services.
> >>>>> >> >
> >>>>
> >>>> >>
> >>>> >>Is this for 4.12 ?
> >>>> >>
> >>>> >>What happens if I build RTEMS with --disable-posix ? If I use 
> locale in
> >>>> >>C++ it pulls in the 'once' support which pulls in this file 
> which would
> >>>> >>give unresolved externals. There is a PR against me for 
> libstdc++ not
> >>>> >>checking the return code. Is it time for the --enable-posix 
> option to go
> >>>> >>and to always nave it enabled ?
> >>>
> >>> >
> >>> >Please don't. The POSIX layer takes valuable resurces and it is not
> >>> >always needed.
> >>> >
> >>
> >> Maybe we should look into this and fix the reasons. Any code not
> >> required should not be included. This is an on going effort in 
> RTEMS and
> >> it requires we expose the cases.
> >
> >
> > We have all the infrastructure to fix this. One part is
> >
> > CFLAGS += -ffunction-sections -fdata-sections
> > LDFLAGS += -Wl,--gc-sections
> >
> > The other part a linker set based initialization (fully implemented 
> in libbsd). One issue is that we have to add support for this in all 
> linker command files. So we need just someone who has time to do this.
>
> Could you please create a ticket for this dumping all the useful 
> informatiom you have in your head there :) since we are interested so 
> we'll likely do it, and any further question can be discussed in the 
> ticket.
>

https://devel.rtems.org/ticket/2407
https://devel.rtems.org/ticket/2408

-- 
Sebastian Huber, embedded brains GmbH

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