From: Paolo Bonzini <bonzini@gnu.org>
To: Davide Libenzi <davidel@xmailserver.org>
Cc: Avi Kivity <avi@redhat.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
gleb@redhat.com, kvm@vger.kernel.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 0/2] eventfd: new EFD_STATE flag
Date: Tue, 25 Aug 2009 08:59:33 +0200 [thread overview]
Message-ID: <4A938BD5.1050302@gnu.org> (raw)
In-Reply-To: <alpine.DEB.2.00.0908241515150.7951@makko.or.mcafeemobile.com>
>>> 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.
No, your code does not work for pthread_cond_broadcast (which arguably
is the common case) because all the eventfd readers after the first
would block.
Paolo
next prev parent reply other threads:[~2009-08-25 6:59 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-20 15:56 [PATCH 0/2] eventfd: new EFD_STATE flag Michael S. Tsirkin
2009-08-20 16:20 ` Davide Libenzi
2009-08-20 17:38 ` Avi Kivity
2009-08-20 17:44 ` Davide Libenzi
2009-08-20 17:56 ` Paolo Bonzini
2009-08-21 17:21 ` Davide Libenzi
2009-08-20 17:55 ` Michael S. Tsirkin
2009-08-20 18:06 ` Avi Kivity
2009-08-20 18:28 ` Michael S. Tsirkin
2009-08-23 13:01 ` Avi Kivity
2009-08-23 13:36 ` Michael S. Tsirkin
2009-08-23 13:40 ` Avi Kivity
2009-08-23 14:30 ` Michael S. Tsirkin
2009-08-23 16:51 ` Paolo Bonzini
2009-08-24 18:25 ` Davide Libenzi
2009-08-24 18:31 ` Avi Kivity
2009-08-24 22:08 ` Davide Libenzi
2009-08-24 22:10 ` Paolo Bonzini
2009-08-24 22:32 ` Davide Libenzi
2009-08-25 6:59 ` Paolo Bonzini [this message]
2009-08-25 4:26 ` Avi Kivity
2009-08-24 21:49 ` Michael S. Tsirkin
2009-08-24 22:15 ` Davide Libenzi
2009-08-25 7:22 ` Michael S. Tsirkin
2009-08-25 21:57 ` Davide Libenzi
2009-08-26 10:29 ` Michael S. Tsirkin
2009-08-26 10:41 ` Avi Kivity
2009-08-26 17:45 ` Davide Libenzi
2009-08-26 18:58 ` Avi Kivity
2009-08-26 19:13 ` Davide Libenzi
2009-08-26 19:42 ` Avi Kivity
2009-08-26 19:44 ` Davide Libenzi
2009-08-26 23:30 ` Davide Libenzi
2009-08-27 4:13 ` Avi Kivity
2009-08-27 8:06 ` Michael S. Tsirkin
2009-08-27 14:20 ` Davide Libenzi
2009-08-26 19:50 ` Gleb Natapov
2009-08-26 20:04 ` Davide Libenzi
2009-08-27 5:25 ` Gleb Natapov
2009-08-27 9:05 ` Paolo Bonzini
2009-08-27 9:09 ` Michael S. Tsirkin
2009-08-27 14:21 ` Davide Libenzi
2009-08-27 14:30 ` Michael S. Tsirkin
2009-08-27 14:38 ` Davide Libenzi
2009-08-27 14:49 ` Michael S. Tsirkin
2009-08-27 15:29 ` Davide Libenzi
2009-08-27 17:09 ` Davide Libenzi
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