add proper fuxed-based locking for stdio

[musl] / src / stdio / ftrylockfile.c

diff --git a/src/stdio/ftrylockfile.c b/src/stdio/ftrylockfile.c
index 0b0e44a..725c4c3 100644 (file)
--- a/src/stdio/ftrylockfile.c
+++ b/src/stdio/ftrylockfile.c
@@ -5,11 +5,12 @@ int ftrylockfile(FILE *f)
 {
        int tid = pthread_self()->tid;
        if (f->lock == tid) {
-               if (f->lockcount == INT_MAX)
+               if (f->lockcount == LONG_MAX)
                        return -1;
                f->lockcount++;
                return 0;
        }
+       if (f->lock < 0) f->lock = 0;
        if (f->lock || a_cas(&f->lock, 0, tid))
                return -1;
        f->lockcount = 1;