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| author | Duncan Overbruck <mail@duncano.de> | 2021-03-01 00:48:20 +0100 |
|---|---|---|
| committer | Leah Neukirchen <leah@vuxu.org> | 2021-03-13 16:27:55 +0100 |
| commit | 4f92a29b943e5d7906b884009758627bc7c3376b (patch) | |
| tree | 3405b8f4a8685651935989933de0865c03e58aa2 | |
| parent | 8cf40887c7b68f0772a46080fb265e67c7f43b36 (diff) | |
| download | nq-4f92a29b943e5d7906b884009758627bc7c3376b.tar.gz nq-4f92a29b943e5d7906b884009758627bc7c3376b.tar.xz nq-4f92a29b943e5d7906b884009758627bc7c3376b.zip | |
fq: use shared locks to avoid holding exclusive locks for a split second
| -rw-r--r-- | fq.c | 4 |
1 files 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 */ |