Davide Libenzi wrote: > On Thu, 23 Apr 2009, Gregory Haskins wrote: > > >>> Take a look at init_waitqueue_func_entry(), in particula at that "func" >>> parameter. Then look at how __wake_up_common() does its thing. >>> You don't need to be "waiting" for our wakeup system to work. Callbacks >>> works just fine, otherwise things like epoll could not work at all. >>> >>> >> Yeah, I was looking at that this afternoon after you mentioned it. That >> makes sense. >> >> As of right now the wqh is embedded in the eventfd, accessible only by >> the .read() vtable entry. In order to do this as you suggest, I imagine >> I need to slightly modify the eventfd interface to allow waiters other >> than the embedded readers to join the wait-queue. How would you like to >> see that interface look? >> > > Actually, you need no changes in eventfd, since you can use its poll() > directly, by dropping a callback entry. > Take a look at how epoll does it in ep_insert()... > Ah! I just tried your suggestion and it was simple and it works. That is brilliant. I will post a follow-up v2 that drops patch 2/3. Thanks, Davide. -Greg
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