From 4d9cc0b399b1d6a146cb45e64c74b7ee562de7a6 Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Wed, 16 Mar 2011 10:39:45 -0400
Subject: optimize file locking: avoid cache-polluting writes to global storage

---
 src/stdio/ftrylockfile.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src/stdio/ftrylockfile.c')

diff --git a/src/stdio/ftrylockfile.c b/src/stdio/ftrylockfile.c
index 725b66e7..1d0a1ff8 100644
--- a/src/stdio/ftrylockfile.c
+++ b/src/stdio/ftrylockfile.c
@@ -3,7 +3,7 @@
 
 int ftrylockfile(FILE *f)
 {
-	libc.lockfile = __lockfile;
+	if (!libc.lockfile) libc.lockfile = __lockfile;
 	if (f->owner && f->owner == pthread_self()->tid) {
 		if (f->lockcount == INT_MAX)
 			return -1;
-- 
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