[Xen-devel] [PATCH ] Avoid potential suspend event channel race

["Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx>]

As discussed previously (see 
http://lists.xensource.com/archives/html/xen-devel/2009-03/msg00570.html), we 
try to make access to event channel be protected. The attached patch achieved 
it through one lock file under /var/lib/xen/.

evet_channel.patch:
Changes the xc_save.c, to remove the dependency to the global si structure and 
has no logic change.

The patch move_evtchn.patch :
Move the suspend event channel function to libxc, it will use the 
/var/lib/xen/suspend_evtchn_lock.d to protect the access.

I'm not sure if using lock file is a right method, so any feedback is welcome.

signed-off-by: Jiang  Yunhong  <yunhong.jiang@xxxxxxxxx>

Thanks
Yunhong Jiang

Attachment: event_channel.patch
Description: event_channel.patch

Attachment: move_evtchn.patch
Description: move_evtchn.patch

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