Re: [PATCH 0/2] eventfd: new EFD_STATE flag

[Davide Libenzi]

On Tue, 25 Aug 2009, Paolo Bonzini wrote:

> 
> > There are userspace libraries that do almost everything, but you hardly
> > see things like pthread_(EFD_STATE-like)_create() or similar system
> > interfaces based on such abstraction.
> 
> It actually seems as close to a condition variable as an eventfd can be.

A pthread condition typical code usage maps to eventfd like:

	while (read(efd, ...) > 0)
		if (CONDITION)
			break;

So a pthread condition is really a wakeup gate like eventfd is.
EFD_STATE has nothing to do with a pthread condition.



- Davide


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