[Bug libc/16291] feature request: provide simpler ways to compute stack and tls boundaries

["konstantin.s.serebryany at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16291

--- Comment #10 from Kostya Serebryany <konstantin.s.serebryany at gmail dot com> ---
(In reply to Rich Felker from comment #9)
> The identity of the current thread does not depend on the current stack
> address. You can get it with pthread_self(), or perhaps even via inspecting
> the thread pointer register (or similar arch-specific mechanism) directly.
> Note that even the stack range provided by pthread_getattr_np or some
> proposed new mechanism is not sufficient to get all possible stack addresses
> the thread might run on, since sigaltstack may be used for signal handlers
> which run in the thread. (There's also GCC's split-stack nonsense but I'm
> assuming everybody's already realized that was a horrible idea and given up
> on using it...)
We are interested only in the main stack: not split-stack, not sigaltstack's
one.

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