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From: | Avi Kivity |
Subject: | Re: [Qemu-devel] [PATCH] Use qemu_eventfd for POSIX AIO |
Date: | Tue, 27 Sep 2011 17:34:18 +0300 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:6.0.2) Gecko/20110906 Thunderbird/6.0.2 |
On 09/27/2011 05:29 PM, Jan Kiszka wrote:
> > Moreover, the eventfd() counter is not lossy (practically speaking) whereas if > you use pipe() as a counter, it will be lossy in practice. > > This is why posix aio uses pipe() and not eventfd(). I don't get this yet. eventfd is lossy by default. It only decreases the counter on read if you specify EFD_SEMAPHORE - which we do not do.
It's not lossy - a read returns the number of events written since the last read.
-- error compiling committee.c: too many arguments to function
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