epoll_wait, epoll_ctl

So, what's supposed to happen in a threaded program where one thread does an epoll_ctl on an epoll fd while another thread is currently waiting in epoll_wait on the same fd? In particular, what happens if a thread does an EPOLL_CTL_DEL on one of the fds that is currently being waited on? Is there a possibility of an event being returned on the fd even after the EPOLL_CTL_DEL completes?

--
 -- Howard Chu
 Chief Architect, Symas Corp.  http://www.symas.com
 Director, Highland Sun        http://highlandsun.com/hyc
 OpenLDAP Core Team            http://www.openldap.org/project/

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