This is just my latest async patch so time that doesn't get wasted on my
previous one.

1) I've moved target specific stuff out of event-loop.c and into linux-nat.c
   and used hooks so e.g it should compile (but not work asynchronously) on
   Windows.
2) It now works with poll as well as select.
3) It's a lot smaller because I've left out changes to gdb-mi.el which
   probably aren't of general interest.
4) The test server-run.exp still fails.

-- 
Nick                                           http://www.inet.net.nz/~nickrob