--- libev/ev_linuxaio.c	2019/06/24 00:04:26	1.15
+++ libev/ev_linuxaio.c	2019/06/24 00:30:24	1.16
@@ -248,7 +248,9 @@
       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;