Xen devel - Sep 2005 - [PATCH 2/2] Make sure that TCP binds don''t fail because of stale state

SO_REUSEADDR does not immediately free up a port when a server is killed 
with a signal (which is what we do for xend stop).  Since there is no 
great way (at least, that I know of) to deal with this, the following 
patch implements a 30 second timeout for bind to help make it highly 
unlikely that we''ll get burned by this.

On a very slow system, killing xend with a signal takes less than a 
second for the port to become available again so 30 seconds seems really 
safe.  With this patch (and the previous one), I can execute the following:

while true; do xend restart && xm list || break; done

And it runs without any trouble (I ran it for an hour before finally 
giving up).

Regards,

Anthony Liguori


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