i386 backtrace() question

[David Mosberger]

While tracking down an unrelated libunwind failure on x86, I came
across this curious test in sysdeps/i386/backtrace.c:

      if ((void *) current < esp || (void *) current > __libc_stack_end)

The test is obvous for non-threaded programs.  However, I'd like to
confirm that the test is OK for multi-threaded programs as well,
because all thread stacks will be allocated below __libc_stack_end.
I'm pretty sure that's true for Linux, though I'm uncertain about how
stack-randomization or other OSes would affect the validity of the
test.  Could somebody confirm?

Thanks,

	--david