(e)poll takeover

[Hans Henrik Happe]

Hi

I have tried to find a way to have a thread take over the event waiting from 
another thread. This should be done without context switching.

A more precise description:

1. Thread A are waiting in poll or epoll.
2. Thread B decides to take over the waiting. This means stopping thread A 
from responding to new events and go into a (e)poll for the same events.
3. After handling some events thread B decides to let thread A take over 
again.

This should be done without context switching. At least in step 3.

The only way I can think of is using two epoll fd's (e0 and e1). e0 should
just contain e1 and e1 should contain the actual events:

Thread A:
 epoll_wait(e0)
 epoll_wait(e1)
 /*handle events*/

Thread B (takeover):
 epoll_ctl(e0, remove e1)
 epoll_wait(e1)
 /*handle events*/
 .
 .
 epoll_ctl(e0, add e1)


I have left out the synchronization.

Is there a better way to do this. Perhaps one that also work with plain 
poll().

Hans  
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