When I am reading struct thread_info, I find the comment on 
step_after_step_resume_breakpoint is not helpful to me to understand it, 
until I read the original patch here 
http://cygwin.com/ml/gdb-patches/2004-08/msg00743.html

The explanation of the patch was very clear, but it is missing in the 
comment of code.  This patch is to copy some of words in original patch 
post to the comment on field `step_after_step_resume_breakpoint', in 
order to make comment self-explained.

OK to apply?

-- 
Yao (齐尧)