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Re: [Qemu-devel] Guest application reading from pl011 without device dri

From: Jiahuan Zhang
Subject: Re: [Qemu-devel] Guest application reading from pl011 without device driver
Date: Thu, 23 Mar 2017 11:12:42 +0100

On 22 March 2017 at 12:27, Paolo Bonzini <address@hidden> wrote:

> On 22/03/2017 11:28, Jiahuan Zhang wrote:
> >
> >     A function that lets a process sleep until data is available on the
> >     socket.  The solution is to rewrite Windows chardev handling in QEMU
> to
> >     use threads or overlapped I/O.
> >
> > Yes, socket is working well. Will you add the "select" to pipe
> > implementation?
> It's Windows that doesn't support it (the Windows function name is
> WaitForSingleObject).

Hi, I have checked the Windows chardev implimentation in QEMU.
I learned from char-win-stdio.c to using thread and WaitForSingleObject for
char-win-stdio.c uses qemu_add_wait_object().
Char-pipe.c uses qemu_add_polling_cb().
I found all over qemu, only char-pipe uses qemu_add_polling_cb().
Does this mean that somebody has already looked into this issue,
and failed in using qemu_add_wait_object(),
and then he/she created qemu_add_polling_cb()?

If so, what I am going to do is just something has been proved to be
Please tell me if my guess is true.


> Paolo
> > Or shall I look into it and fix? Since in my case, I prefer windows pipe
> > to socket.
> > But if I do, definitly, I will spend much more effort than you, the
> experts.

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