1 files changed, 15 insertions, 0 deletions
diff --git a/lib9/lock-Nt-386.c b/lib9/lock-Nt-386.c
new file mode 100644
index 00000000..641907ef
--- /dev/null
+++ b/lib9/lock-Nt-386.c
@@ -0,0 +1,15 @@
+#include "lib9.h"
+
+ulong
+_tas(ulong *la)
+{
+	ulong v;
+
+	_asm {
+		mov eax, la
+		mov ebx, 1
+		xchg	ebx, [eax]
+		mov	v, ebx
+	}
+	return v;
+}