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Date: Wed, 8 Nov 2017 19:18:44 +0800
From: Fam Zheng <famz@redhat.com>
Message-ID: <20171108111844.GD2834@lemon>
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Subject: Re: [Qemu-devel] [RFC v3 10/27] monitor: create monitor dedicate
 iothread
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To: Peter Xu <peterx@redhat.com>
Cc: Laurent Vivier <lvivier@redhat.com>, Juan Quintela <quintela@redhat.com>, Markus Armbruster <armbru@redhat.com>, qemu-devel@nongnu.org, mdroth@linux.vnet.ibm.com, Stefan Hajnoczi <shajnocz@redhat.com>, marcandre.lureau@redhat.com, Paolo Bonzini <pbonzini@redhat.com>, Jiri Denemark <jdenemar@redhat.com>, "Dr . David Alan Gilbert" <dgilbert@redhat.com>

On Wed, 11/08 15:25, Peter Xu wrote:
> On Tue, Nov 07, 2017 at 03:11:31PM +0800, Fam Zheng wrote:
> > On Mon, 11/06 17:46, Peter Xu wrote:
> > > +static GMainContext *monitor_io_context_get(void)
> > > +{
> > > +    return iothread_get_g_main_context(mon_global.mon_iothread);
> > > +}
> > > +
> > > +static void monitor_iothread_init(void)
> > > +{
> > > +    mon_global.mon_iothread = iothread_create("monitor_iothread",
> > > +                                              &error_abort);
> > > +    /*
> > > +     * GContext in iothread is using lazy init - the first time we
> > > +     * fetch the context we'll have that initialized.
> > > +     */
> > > +    monitor_io_context_get();
> > 
> > Why do you need an eager init here?
> 
> I thought putting this line with IOThread creation will make it more
> clear that the IOThread is using GMainContext polling.  I am not that
> strong to keep it, but I would prefer.

The "iothread only starts using GMainContext polling after the lazy init
happens" is completely opaque to its user, so I don't think there is anything
but confusion to have this.

Fam