--- libaitsched/inc/defs.h	2012/01/08 00:51:17	1.3
+++ libaitsched/inc/defs.h	2012/01/24 21:59:46	1.4
@@ -3,7 +3,7 @@
 *  by Michael Pounov <misho@openbsd-bg.org>
 *
 * $Author: misho $
-* $Id: defs.h,v 1.3 2012/01/08 00:51:17 misho Exp $
+* $Id: defs.h,v 1.4 2012/01/24 21:59:46 misho Exp $
 *
 **************************************************************************
 The ELWIX and AITNET software is distributed under the following
@@ -56,6 +56,33 @@ SUCH DAMAGE.
 			strlcpy(sched_Error, strerror(errno), STRSIZ); \
 		}
 
+#define sched_timespecclear(tsp)	((tsp)->tv_sec = (tsp)->tv_nsec = 0)
+#define sched_timespecinf(tsp)		((tsp)->tv_sec = (tsp)->tv_nsec = -1)
+#define sched_timespecisinf(tsp)	((tsp)->tv_sec == -1 && (tsp)->tv_nsec == -1)
+#define sched_timespecisset(tsp)	(((tsp)->tv_sec && (tsp)->tv_sec != -1) || \
+						((tsp)->tv_nsec && (tsp)->tv_nsec != -1))
+#define sched_timespeccmp(tsp, usp, cmp)				\
+	(((tsp)->tv_sec == (usp)->tv_sec) ?				\
+		((tsp)->tv_nsec cmp (usp)->tv_nsec) :			\
+		((tsp)->tv_sec cmp (usp)->tv_sec))
+#define sched_timespecadd(tsp, usp, vsp)				\
+	do {								\
+		(vsp)->tv_sec = (tsp)->tv_sec + (usp)->tv_sec;		\
+		(vsp)->tv_nsec = (tsp)->tv_nsec + (usp)->tv_nsec;	\
+		if ((vsp)->tv_nsec >= 1000000000L) {			\
+			(vsp)->tv_sec++;				\
+			(vsp)->tv_nsec -= 1000000000L;			\
+		}							\
+	} while (0)
+#define sched_timespecsub(tsp, usp, vsp)				\
+	do {								\
+		(vsp)->tv_sec = (tsp)->tv_sec - (usp)->tv_sec;		\
+		(vsp)->tv_nsec = (tsp)->tv_nsec - (usp)->tv_nsec;	\
+		if ((vsp)->tv_nsec < 0) {				\
+			(vsp)->tv_sec--;				\
+			(vsp)->tv_nsec += 1000000000L;			\
+		}							\
+	} while (0)
 
 extern int sched_Errno;
 extern char sched_Error[];