X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;ds=sidebyside;f=src%2Fstdio%2Fftrylockfile.c;h=67f4b6a070ca2c1c833c8d92401e6f8ac75c251f;hb=a37452430f93700aeb122d693959ad79d8e43ada;hp=725b66e735aff23ed5e9c0a2335d677ace3374ce;hpb=5eb0d33ec0f08b123c5c10877d6258d05fa9453a;p=musl

diff --git a/src/stdio/ftrylockfile.c b/src/stdio/ftrylockfile.c
index 725b66e7..67f4b6a0 100644
--- a/src/stdio/ftrylockfile.c
+++ b/src/stdio/ftrylockfile.c
@@ -3,16 +3,16 @@
 
 int ftrylockfile(FILE *f)
 {
-	libc.lockfile = __lockfile;
-	if (f->owner && f->owner == pthread_self()->tid) {
+	int tid = pthread_self()->tid;
+	if (!libc.lockfile) libc.lockfile = __lockfile;
+	if (f->lock == tid) {
 		if (f->lockcount == INT_MAX)
 			return -1;
 		f->lockcount++;
 		return 0;
 	}
-	if (a_swap(&f->lock, 1))
+	if (f->lock || a_cas(&f->lock, 0, tid))
 		return -1;
-	f->owner = pthread_self()->tid;
 	f->lockcount = 1;
 	return 0;
 }