From 4f92a29b943e5d7906b884009758627bc7c3376b Mon Sep 17 00:00:00 2001
From: Duncan Overbruck <mail@duncano.de>
Date: Mon, 1 Mar 2021 00:48:20 +0100
Subject: fq: use shared locks to avoid holding exclusive locks for a split
 second

---
 fq.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fq.c b/fq.c
index ebfe6f8..a61240f 100644
--- a/fq.c
+++ b/fq.c
@@ -43,7 +43,7 @@ char buf[8192];
 static int
 islocked(int fd)
 {
-	if (flock(fd, LOCK_EX | LOCK_NB) == -1) {
+	if (flock(fd, LOCK_SH | LOCK_NB) == -1) {
 		return (errno == EWOULDBLOCK);
 	} else {
 		flock(fd, LOCK_UN);
@@ -207,7 +207,7 @@ main(int argc, char *argv[])
 				if (nflag && islocked(fd))
 					break;
 
-				if (flock(fd, LOCK_EX | LOCK_NB) == -1 &&
+				if (flock(fd, LOCK_SH | LOCK_NB) == -1 &&
 				    errno == EWOULDBLOCK) {
 #if defined(USE_INOTIFY)
 					/* any inotify event is good */
-- 
cgit 1.4.1