[concurrency-interest] Quick question on ConcurrentLinkedQueue
jseigh_cp00 at xemaps.com
Mon Apr 9 06:31:24 EDT 2007
Hanson Char wrote:
>Say we have two initially empty j.u.c.ConcurrentLinkedQueue, clq1 and
>clq2. If two threads offered to each queue individually at the same
>time, followed by polling the other queue, is it possible for both
>threads to observer the other queue as being empty ?
>In other words:
>Time Thread1 Thread2
>0 clq1.offer clq2.offer
>1 x=clq2.poll y=clq1.poll
>Can both x and y be null ?
No. ConcurrentLinkedQueue contains volatile fields which give it
acquire and release semantics.
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