From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Mon, 6 Jul 2015 20:32:28 +0000 (-0400)
Subject: Fix: handle sys_futex() FUTEX_WAIT interrupted by signal
X-Git-Tag: v0.9.0~47
X-Git-Url: https://git.lttng.org/?a=commitdiff_plain;h=b0a841b4ff807dd29fe0cdbfe24900312f0e627b;hp=b0a841b4ff807dd29fe0cdbfe24900312f0e627b;p=urcu.git

Fix: handle sys_futex() FUTEX_WAIT interrupted by signal

We need to handle EINTR returned by sys_futex() FUTEX_WAIT, otherwise a
signal interrupting this system call could make sys_futex return too
early, and therefore cause a synchronization issue.

Ensure that the futex compatibility layer returns meaningful errors and
errno when using poll() or pthread cond variables.

Reported-by: Gerd Gerats <geg@ngncc.de>
CC: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
CC: Lai Jiangshan <laijs@cn.fujitsu.com>
CC: Stephen Hemminger <shemminger@vyatta.com>
CC: Alan Stern <stern@rowland.harvard.edu>
CC: lttng-dev@lists.lttng.org
CC: rp@svcs.cs.pdx.edu
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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