glibc, linuxthreads, floating stacks

[Robert Millan]

On Mon, Dec 12, 2005 at 10:39:09PM +0100, Petr Salinger wrote:
> Hi all!

Hi Petr!

> During last search due to problems with thread signaling 
> I found cmd I386_SET_GSBASE for sysarch().
> This is similar to linux-2.6 set_thread_area().
> 
> It is rather easy to enable FLOATING_STACKS in glibc/linuxthreads
> for our current kfreebsd-5 kernel. The same syscall can be also 
> used later to enable __thread keyword and whole TLS.
> 
> The attached pt-machine.h should go into 
> glibc-2.3/linuxthreads/sysdeps/unix/bsd/bsd4.4/kfreebsd/i386/i486/pt-machine.h
> 
> It applies to both glibc 2.3.0 and 2.3.5, successfully tested with 2.3.0.

Just a sidenote:  it seems this pt-machine.h is heavily based on another version
of this file, although I'm not sure which one.  Have you considered something
like this to avoid repetition of code?:

  #include_next <pt-machine.h>
  [ kfreebsd-specific stuff ]

(the include_next gcc hack is widely used on glibc, so upstream would be ok with
that, I think)

> BTW, is there any progress for glibc 2.3.5 ?
> Can I help with something ?

Sorry I don't know.  You'll have to ask Aurelien.

-- 
Robert Millan

"it's about trust... i don't trust them. that's all i need to know."
  (wrt Digital Restriction Management, seen in Slashdot)