tools/lib/timeout.h, tools/lib/timeout.c: added timeout/deadline functions

tools/lib/timeout.h

@@ -0,0 +1,29 @@
+/*
+ * lib/timeout.h - ATRF driver API
+ *
+ * Written 2011 by Werner Almesberger
+ * Copyright 2011 Werner Almesberger
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+
+#ifndef TIMEOUT_H
+#define	TIMEOUT_H
+
+#include <sys/time.h>
+
+
+struct timeout {
+	struct timeval end;
+};
+
+
+void timeout_start(struct timeout *t, int ms);
+int timeout_reached(const struct timeout *t);
+int timeout_left_ms(const struct timeout *t);
+
+#endif /* !TIMEOUT_H */