libmemif: timer causes spin at 100% cpu
In case of timer is set and expires:
1. timer_fd is readable and stay readable.
2. timer_fd is part of epoll_fd set. This makes epoll_pwait()
calls return immediately instead of sleeping.
Type: fix
Signed-off-by: Daniel Béreš <dberes@cisco.com>
Change-Id: I9b228464fe45b83def9b182c885d6febf428049c
diff --git a/extras/libmemif/src/main.c b/extras/libmemif/src/main.c
index 397c2bb..21b3994 100644
--- a/extras/libmemif/src/main.c
+++ b/extras/libmemif/src/main.c
@@ -409,6 +409,16 @@
memif_socket_t *ms = (memif_socket_t *) private_ctx;
memif_connection_t *c;
+ if (ms->timer_fd >= 0)
+ {
+ uint64_t u64;
+ /*
+ Have to read the timer fd else it stays read-ready
+ and makes epoll_pwait() return without sleeping
+ */
+ read (ms->timer_fd, &u64, sizeof (u64));
+ }
+
/* loop ms->slave_interfaces and request connection for disconnected ones */
TAILQ_FOREACH (c, &ms->slave_interfaces, next)
{