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-rw-r--r--src/stdio/__lockfile.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/src/stdio/__lockfile.c b/src/stdio/__lockfile.c
index 2ff75d8a..0dcb2a42 100644
--- a/src/stdio/__lockfile.c
+++ b/src/stdio/__lockfile.c
@@ -8,13 +8,13 @@ int __lockfile(FILE *f)
 	int owner = f->lock, tid = __pthread_self()->tid;
 	if ((owner & ~MAYBE_WAITERS) == tid)
 		return 0;
-	for (;;) {
-		owner = a_cas(&f->lock, 0, tid);
-		if (!owner) return 1;
-		if (a_cas(&f->lock, owner, owner|MAYBE_WAITERS)==owner) break;
+	owner = a_cas(&f->lock, 0, tid);
+	if (!owner) return 1;
+	while ((owner = a_cas(&f->lock, 0, tid|MAYBE_WAITERS))) {
+		if ((owner & MAYBE_WAITERS) ||
+		    a_cas(&f->lock, owner, owner|MAYBE_WAITERS)==owner)
+			__futexwait(&f->lock, owner|MAYBE_WAITERS, 1);
 	}
-	while ((owner = a_cas(&f->lock, 0, tid|MAYBE_WAITERS)))
-		__futexwait(&f->lock, owner, 1);
 	return 1;
 }