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1.0.41.6: threads: Insert barriers as appear to be required.
[sbcl.git]
/
contrib
/
sb-concurrency
/
queue.lisp
diff --git
a/contrib/sb-concurrency/queue.lisp
b/contrib/sb-concurrency/queue.lisp
index
fec6d0f
..
a902785
100644
(file)
--- a/
contrib/sb-concurrency/queue.lisp
+++ b/
contrib/sb-concurrency/queue.lisp
@@
-66,6
+66,7
@@
and secondary value."
(tail (queue-tail queue))
(first-node-prev (node-prev head))
(val (node-value head)))
+ (barrier (:read))
(when (eq head (queue-head queue))
(cond ((not (eq val +dummy+))
(if (eq tail head)