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Re: [Qemu-devel] [PATCH] Merge NBD client/server int qemu-nbd

From: Anthony Liguori
Subject: Re: [Qemu-devel] [PATCH] Merge NBD client/server int qemu-nbd
Date: Sun, 15 Jun 2008 09:25:35 -0500
User-agent: Thunderbird (X11/20080501)

Laurent Vivier wrote:
Le samedi 14 juin 2008 à 12:35 -0700, Avi Kivity a écrit :
Laurent Vivier wrote:

It is udev that creates the devices, based on events it receives from the kernel. Calling udevsettle after the kernel instructs udev to create the device files will wait until they are actually created.
Yes, I agree but the kernel events are generated by the open(), so I
think I can't use this to know if I can use open().
I've used udevmonitor to see what happen:
- without open() -> no events
- whith open() whithout sleep() -> no events
-> open() + sleep() -> events generated by the partition creation.

So, what do I miss ?
For this, it seems like sleep() generates the events, which is a little unlikely. I suggest re-checking this.

re-checked, no events with sleep() only.

events generated with sleep() + open() are:

I imagine the sleep() is causing another task to be scheduled (probably the server) which is what ends up generating the event.


Anthony Liguori

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