Messages in this thread | | | Date | Mon, 30 Jun 2008 11:03:52 -0700 | From | Zach Brown <> | Subject | Re: [PATCH] aio: use cmpxchg in aio_read_evt() instead of aio_ring_info->ring_lock |
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Nikanth Karthikesan wrote: > Use cmpxchg in aio_read_evt() and remove the aio_ring_info->ring_lock
I don't think this is safe because the cmpxhg() can't differentiate the 0 it read at one point with a 0 that it reads in the future after other racing threads have done enough work on the ring index to wrap it.
- z
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