From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Fri, 30 Oct 2015 21:11:55 +0000 (-0400)
Subject: Fix: urcu-signal: smp_mb_master() needs registry lock
X-Git-Tag: v0.10.0~62
X-Git-Url: https://git.liburcu.org/?p=urcu.git;a=commitdiff_plain;h=fca9fb961ecf6726769035fd41bc8a9a054aafb7;hp=fca9fb961ecf6726769035fd41bc8a9a054aafb7

Fix: urcu-signal: smp_mb_master() needs registry lock

The signal-based urcu flavor calls smp_mb_master() within the wait_gp()
function. Since commit "Fix: deadlock when thread join is issued in
read-side C.S.", wait_gp() is called without the registry lock held.

Ensure that the registry lock is only released around the wait per se,
not around the call to smp_mb_master(), otherwise we end up iterating on
a non-consistent thread registry in smp_mb_master().

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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