X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Fstdio%2Fftrylockfile.c;h=67f4b6a070ca2c1c833c8d92401e6f8ac75c251f;hb=e72180083e4b0203d1883b6054198decdb60071c;hp=1d0a1ff8662baad6ce8593348c4179530b70ca4e;hpb=4d9cc0b399b1d6a146cb45e64c74b7ee562de7a6;p=musl

diff --git a/src/stdio/ftrylockfile.c b/src/stdio/ftrylockfile.c
index 1d0a1ff8..67f4b6a0 100644
--- a/src/stdio/ftrylockfile.c
+++ b/src/stdio/ftrylockfile.c
@@ -3,16 +3,16 @@
 
 int ftrylockfile(FILE *f)
 {
+	int tid = pthread_self()->tid;
 	if (!libc.lockfile) libc.lockfile = __lockfile;
-	if (f->owner && f->owner == pthread_self()->tid) {
+	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;
 }