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[Xen-devel] xenstored startup - race condition

To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] xenstored startup - race condition
From: Bastian Blank <bastian@xxxxxxxxxxxx>
Date: Fri, 7 Mar 2008 13:14:51 +0100
Delivery-date: 2008年3月07日 04:15:16 -0800
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Hi folks
The Debian packages carries a patch since some time which fixes a race
condition in the xenstore startup. Sometimes xenconsoled is not able to
connect the xenstore and just exits. A second try works, so xenstored
was just not yet ready.
Proposed fix:
- xend asks xenstored to also fork, this also reparents it to init.
- xenstored delays the exit of the parent until properly initialized and
 ready to accept connections.
- xend waits for exit of this process.
Implementation: Either fork, execv and waitpid or subprocess.
Bastian
-- 
Yes, it is written. Good shall always destroy evil.
 -- Sirah the Yang, "The Omega Glory", stardate unknown
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