From: Willy Tarreau <w@1wt.eu>
Date: Mon, 13 Mar 2017 19:49:56 +0000 (+0100)
Subject: MEDIUM: kqueue: only set FD_POLL_IN when there are pending data
X-Git-Tag: v1.8-dev1~58
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=fa0617660a9f288caade3c00382fbe3b3c2ffa6d;p=thirdparty%2Fhaproxy.git

MEDIUM: kqueue: only set FD_POLL_IN when there are pending data

Let's avoid setting FD_POLL_IN when there's no pending data. It will
save a useless recv() syscall on pure closes.
---

diff --git a/src/ev_kqueue.c b/src/ev_kqueue.c
index 6f41c731f4..f1c0b8d000 100644
--- a/src/ev_kqueue.c
+++ b/src/ev_kqueue.c
@@ -125,7 +125,8 @@ REGPRM2 static void _do_poll(struct poller *p, int exp)
 		fdtab[fd].ev &= FD_POLL_STICKY;
 
 		if (kev[count].filter ==  EVFILT_READ) {
-			fdtab[fd].ev |= FD_POLL_IN;
+			if (kev[count].data)
+				fdtab[fd].ev |= FD_POLL_IN;
 			if (kev[count].flags & EV_EOF)
 				fdtab[fd].ev |= FD_POLL_HUP;
 		}