removing taskvares (was Re: rtems_filesystem_current issues)

[cjohns at cybertec.com.au (Chris Johns)]

Till Straumann wrote:
> 
> Absolutely - one obvious solution would be attaching something like
> 
> struct reent_rtems {
>     struct _reent _reent;
>     /* could have some padding here *7
>     struct userenv uenv;
> }
> 
> to the _REENT pointer.
> 

I sort of agree. The introduction of a rtems_reent and a rtems_REENT
variable was something I was also considering. We need to keep the code
in the context switcher for the _REENT (_Thread_Set_libc_reent), and add
new code for rtems_REENT (_Thread_Set_rtems_reent). I do not think you
can change the meaning of _REENT without newlib being effected.

It maybe a good time to look at the other uses of taskvars and remove
them. The C++ wrappers, shell, and RPC code.

-- 
 Chris Johns, cjohns at cybertec.com.au