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

["bugdal at aerifal dot cx" <sourceware-bugzilla at sourceware dot org>]

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

--- Comment #24 from Rich Felker <bugdal at aerifal dot cx> ---
What about an enumeration API that takes a target pthread_t rather than
operating on the calling thread? This is just an idea; I'm not sure I like it
either, because it's inherently racy (the information returned may be outdated)
unless you call it with the target thread stopped or at least blocked. I also
think it may be unsafe to call it from a "thread" created with raw clone, but
this really applies to ANY libc function (even the others we're proposing); all
libc functions are free to assume they have a valid thread pointer, TCB, TLS,
DTV, etc. which LeakSanitizer cannot provide without poking badly at glibc
internals. Is there a reason you're not simply using pthread_create to create
this thread? The POSIX threads API is intended to be such that applications
should not need to know or care about the existence of threads produced
internally by the implementation or by third-party library functions.

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