From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Wed, 19 Dec 2012 00:31:21 +0000 (-0500)
Subject: Fix call_rcu fork handling
X-Git-Tag: v0.6.9~5
X-Git-Url: http://git.liburcu.org/?p=userspace-rcu.git;a=commitdiff_plain;h=483c853e4227f9d0b3ad03f7a4bd8038fe26da89;hp=483c853e4227f9d0b3ad03f7a4bd8038fe26da89

Fix call_rcu fork handling

Fix call_rcu fork handling by putting all call_rcu threads in a
quiescent state before fork (paused state), and unpausing them when the
parent returns from fork.

On the child, everything will run fine as long as we don't issue fork()
from a call_rcu callback.

Side-note: pthread_atfork is not appropriate when using with multithread
and malloc/free. The glibc malloc implementation sadly expects that all
malloc/free are executed from the context of a single thread while
pthread atfork handlers are running, which leads to interesting hang in
glibc.

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