Add comment for eventflag.

2019-02-22 14:00:44 +09:00
parent 078c8db5d7
commit bd330d81c3
1 changed files with 3 additions and 0 deletions
--- a/eventflag.c
+++ b/eventflag.c
@@ -74,6 +74,9 @@ eventflag_prepare_poll (struct eventflag *ev, chopstx_poll_cond_t *poll_desc)
 }


+/* When multiple events are marked, event with lower bit has precedence.
+   Because __builtin_ffs returns the least significant 1-bit.  */
+
 eventmask_t
 eventflag_get (struct eventflag *ev)
 {