From mboxrd@z Thu Jan  1 00:00:00 1970
From: Paolo Bonzini <bonzini@gnu.org>
Subject: Re: [PATCH 0/2] eventfd: new EFD_STATE flag
Date: Tue, 25 Aug 2009 00:10:44 +0200
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> 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.

Paolo