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xen-devel
Re: [Xen-devel] [PATCH] Add an ioctl interface for simple xenstore acces
On 20 Mar 2006, at 08:52, Ewan Mellor wrote:
Watches work in kernel space in domU (the frontends to the split device
drivers use them), but they don't work in userspace there. The
problem is
that there is no support in xenbus for blocking a userspace process
waiting
for a watch to fire.
There's no need for special-case blocking in the kernel. The
libxenstore reader thread will block on read() and then wake up other
threads as necessary by writing to a pipe. All that's needed in the
kernel is some bookkeeping to allow demux and teardown if the device
file is closed. Some of that can be pushed to xenstored if we extend it
to support multiple connections over a single shared page, but it's not
really necessary.
-- Keir
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