Re: Pretest next week

[Jason Rumney]

Chong Yidong wrote:
> Adrian Robert <address@hidden> writes:
>
>   
> > What is the entry point for detecting the Ctrl-G (or any other user
> > keyboard input), when a tight loop is running, such as (while t t)?
> > Is the SIGIO signal handler used, or is W32 itself asynchronously
> > calling something in w32fns.c or w32term.c on a second thread?
> >     
>
> I think this is done in the SIGIO signal handler (at least, according to
> the comment for w32_read_socket in w32fns.c).  Jason, could you confirm
> this?
>   

W32 does not have a SIGIO signal handler, so that comment is probably a 
copy and paste error. On Windows, a second thread is listening for 
window system messages. w32_read_socket is the Lisp thread's message 
handler, C-g detection is done in post_character_message (w32fns.c) 
which is the point where the input message is posted from the window 
system message handling thread to the lisp thread.