--- libev/ev_linuxaio.c	2019/06/23 22:57:25	1.11
+++ libev/ev_linuxaio.c	2019/06/23 23:02:09	1.12
@@ -233,6 +233,7 @@
                         || ring->header_length != sizeof (struct aio_ring)) /* TODO: or use it to find io_event[0]? */
     return 0;
 
+  /* make sure the events up to tail are visible */
   ECB_MEMORY_FENCE_ACQUIRE;
 
   /* parse all available events, but only once, to avoid starvation */
@@ -245,8 +246,7 @@
     }
 
   *(volatile unsigned *)&ring->head = tail;
-
-  /* again, other implementations don't do this, but I think it's required for the kernel to see free slots */
+  /* make sure kernel can see our new head value - probably not required */
   ECB_MEMORY_FENCE_RELEASE;
 
   return 1;