lib9: make formatting lock-free again

First use of <stdatomic.h>.
We will see if any supported systems don't have it yet.
(C11 was so last decade.)

Fixes #338.

1 files changed, 2 insertions, 4 deletions

diff --git a/src/lib9/fmt/fmtdef.h b/src/lib9/fmt/fmtdef.h
index d547184d..2bafd36d 100644
--- a/src/lib9/fmt/fmtdef.h
+++ b/src/lib9/fmt/fmtdef.h
@@ -36,10 +36,8 @@ void *       __fmtflush(Fmt *f, void *t, int len);
 int          __fmtpad(Fmt *f, int n);
 double       __fmtpow10(int n);
 int          __fmtrcpy(Fmt *f, const void *vm, int n);
-void         __fmtrlock(void);
-void         __fmtrunlock(void);
-void         __fmtwlock(void);
-void         __fmtwunlock(void);
+void         __fmtlock(void);
+void         __fmtunlock(void);
 int          __ifmt(Fmt *f);
 int          __isInf(double d, int sign);
 int          __isNaN(double d);