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From: Paolo Bonzini <pbonzini@redhat.com>
To: "Li Qiang" <liq3ea@gmail.com>,
	stefanha@redhat.com, fam@euphon.net,
	"Qemu Developers" <qemu-devel@nongnu.org>, 李强 <liq3ea@163.com>
Subject: Re: [Qemu-devel] Question about aio_poll and glib aio_ctx_dispatch
Date: Wed, 19 Dec 2018 21:41:53 +0100	[thread overview]
Message-ID: <c3b72adf-86c0-6a45-026c-838e4b7187da@redhat.com> (raw)
In-Reply-To: <CAKXe6SK8SXVKZ23c+QNJLEGYOkY57ovFHKNwT3byTTZai3bdaw@mail.gmail.com>

On 19/12/18 11:05, Li Qiang wrote:
> Sent it to qemu-devel.
> 
> Li Qiang <liq3ea@gmail.com <mailto:liq3ea@gmail.com>> 于2018年12月19日周
> 三 下午6:04写道：
> 
>     Hello Paolo, Stefan, Fam and all,
> 
>     Here I have a question about 'aio_poll'.
>     IIUC the 'aio_poll' is (mostly) used for synchronous IO
>     as I see a lot of code like this: 
>     while(condition)
>      aio_poll();
> 
>     However it seems the 'aio_poll' and 'aio_ctx_dispatch' both poll the fd.
>     So what happened when the 'fd' has events, which function will be
>     wakeup?

Roughly speaking, aio_poll is used for synchronous IO and within I/O
threads; aio_ctx_dispatch is used within the main thread.

Both end up calling aio_dispatch_handlers and timerlistgroup_run_timers.

Paolo

  reply	other threads:[~2018-12-19 20:42 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CAKXe6SK+Pm8hGh=BXQ8FosVd=s4S+oc4moxJOjOq5HNeoG5Jcw@mail.gmail.com>
2018-12-19 10:05 ` [Qemu-devel] Question about aio_poll and glib aio_ctx_dispatch Li Qiang
2018-12-19 20:41   ` Paolo Bonzini [this message]
2018-12-19 22:58     ` [Qemu-devel] 答复: " Li Qiang
2018-12-20  1:25       ` [Qemu-devel] " Fam Zheng
2018-12-20  8:34         ` Li Qiang

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