From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Date: Sun, 20 Sep 2009 16:03:37 +0000 (-0400)
Subject: urcu-defer: remove unnecessary memory barrier
X-Git-Tag: v0.1~60
X-Git-Url: http://git.liburcu.org/?p=urcu.git;a=commitdiff_plain;h=9374f873bd741e91b0b5c78a8e0406d849ca752e;hp=9374f873bd741e91b0b5c78a8e0406d849ca752e

urcu-defer: remove unnecessary memory barrier

All synchronization between queue producer/consumer is performed by the write to
"head". Before this write, none of the queued data is visible from the consumer
point of view.

Therefore, just a single wmb() is required before writing to head to ensure
correct synchronization. This matches with the rmb() after reading head on the
consumer side.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---