Re: [Qemu-devel] [PATCH 0/4] monitor: do not rely on O_NONBLOCK for passed file descriptors

[Stefan Hajnoczi]

On Wed, Mar 27, 2013 at 04:37:52PM +0800, liu ping fan wrote:
> On Wed, Mar 27, 2013 at 12:07 AM, Stefan Hajnoczi <address@hidden> wrote:
> > There are several places where QEMU accidentally relies on the O_NONBLOCK 
> > state
> > of passed file descriptors.  Exposing O_NONBLOCK state makes it part of the 
> > QMP
> 
> If in future, we push more backend on their dedicated thread, will the
> related fd be block?

This series is not related to threading in QEMU.  The convention it
establishes is that passed fds are blocking.  If QEMU wants to use
nonblocking it must call qemu_set_block(fd).  This works whether it is
done from a traditional QEMU thread or a data plane thread.

Stefan