From: David Goulet <dgoulet@efficios.com>
Date: Tue, 13 Mar 2012 15:13:25 +0000 (-0400)
Subject: Fix double PID registration race
X-Git-Tag: v2.0.0-rc3~5
X-Git-Url: http://git.liburcu.org/?a=commitdiff_plain;ds=inline;h=852d003742c637d479f91767b853aa85eb0ef258;hp=852d003742c637d479f91767b853aa85eb0ef258;p=lttng-tools.git

Fix double PID registration race

Introduce a second hash table indexed by application socket which have
the exact same content as the hash table indexed by PID.

On unregister, we now use a direct lookup per socket instead of using
the key map between sock and PID. This prevents the PID-sock lookup race
when the unregister happens just after the replace and before the
close(fd).

We also use an add_replace call on application registration for the PID
hash table and kept the add_unique for the socket hash table.

(closes #7)

Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: David Goulet <dgoulet@efficios.com>
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