1 files changed, 8 insertions, 0 deletions

diff --git a/lock.h b/lock.h
new file mode 100644
index 0000000..a7dee41
--- /dev/null
+++ b/lock.h
@@ -0,0 +1,8 @@
+#ifndef LOCK_H
+#define LOCK_H
+
+extern int lock_ex();
+extern int lock_un();
+extern int lock_exnb();
+
+#endif