tree 270efee346b70ae6615dd4796363479c94eca6d9
parent 0f0c4fab8284f3b886b2e1e0e317e3bb8de176b3
author Rusty Russell <rusty@rustcorp.com.au> 1217343518 -0500
committer Rusty Russell <rusty@rustcorp.com.au> 1217289519 +1000

lguest: turn Waker into a thread, not a process

lguest uses a Waker process to break it out of the kernel (ie.
actually running the guest) when file descriptor needs attention.

Changing this from a process to a thread somewhat simplifies things:
it can directly access the fd_set of things to watch.  More
importantly, it means that the Waker can see Guest memory correctly,
so /dev/vring file descriptors will work as anticipated (the
alternative is to actually mmap MAP_SHARED, but you can't do that with
/dev/zero).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>