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Marc Alexander Lehmann 2019-06-24 00:30:24 +00:00
parent 83816c5796
commit 29e7eb43c1
1 changed files with 3 additions and 1 deletions
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4
ev_linuxaio.c
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@ -248,7 +248,9 @@ linuxaio_get_events_from_ring (EV_P)
linuxaio_parse_events (EV_A_ ring->io_events, tail);
}
/* as an extension to C, we hope that the volatile will makethis atomic and once-only */
/* TODO: we only need a compiler barrier here, not a read fence */
ECB_MEMORY_FENCE_RELEASE;
/* as an extension to C, we hope that the volatile will make this atomic and once-only */
*(volatile unsigned *)&ring->head = tail;
/* make sure kernel can see our new head value - probably not required */
ECB_MEMORY_FENCE_RELEASE;