linux-kernel - Re: [PATCH 0/2] eventfd: new EFD

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Message-ID: <alpine.DEB.2.00.0908241515150.7951@makko.or.mcafeemobile.com>
Date:	Mon, 24 Aug 2009 15:32:46 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Paolo Bonzini <bonzini@....org>
cc:	Avi Kivity <avi@...hat.com>, "Michael S. Tsirkin" <mst@...hat.com>,
	gleb@...hat.com, kvm@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] eventfd: new EFD_STATE flag

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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