tree 05bea15a25c9d9a4dcc0658a6a8bf845daca535a
parent a6085fbaf65ab09bfb5ec8d902d6d21680fe1895
author Davide Libenzi <davidel@xmailserver.org> 1263404076 -0800
committer Marcelo Tosatti <mtosatti@redhat.com> 1264429598 -0200

eventfd - allow atomic read and waitqueue remove

KVM needs a wait to atomically remove themselves from the eventfd ->poll()
wait queue head, in order to handle correctly their IRQfd deassign
operation.

This patch introduces such API, plus a way to read an eventfd from its
context.

Signed-off-by: Davide Libenzi <davidel@xmailserver.org>
Signed-off-by: Avi Kivity <avi@redhat.com>