X-Git-Url: http://git.ozlabs.org/?a=blobdiff_plain;f=ccan%2Ftime%2Ftime.h;h=f2b335cf45de0af387c2b0a9e1cba09c73ceb86a;hb=a7f2b2c4d3e62cbbcb71628363e39f6730fd8f5e;hp=5c916f4c4c2ef04b9648791d862bb3eea731a6cd;hpb=58c5a3524737ec1f6500dd766f717e2f158fc5c0;p=ccan

diff --git a/ccan/time/time.h b/ccan/time/time.h
index 5c916f4c..f2b335cf 100644
--- a/ccan/time/time.h
+++ b/ccan/time/time.h
@@ -127,7 +127,7 @@ struct timeabs time_now(void);
  * This value is only really useful for measuring time intervals.
  *
  * See also:
- *	time_since()
+ *	timemono_since()
  */
 struct timemono time_mono(void);
 
@@ -320,6 +320,17 @@ static inline struct timerel timemono_between(struct timemono recent,
 	return t;
 }
 
+/**
+ * timemono_since - elapsed monotonic time since @old
+ * @old: a monotonic time from the past.
+ */
+static inline struct timerel timemono_since(struct timemono old)
+{
+	struct timemono now = time_mono();
+
+	return timemono_between(now, old);
+}
+
 /**
  * timeabs_sub - subtract a relative time from an absolute time
  * @abs: the absolute time.
@@ -377,6 +388,28 @@ static inline struct timeabs timeabs_add(struct timeabs a, struct timerel b)
 	return t;
 }
 
+/**
+ * timemono_add - add a relative to a monotonic time
+ * @a: the monotonic time.
+ * @b: a relative time.
+ *
+ * The times must not overflow, or the results are undefined.
+ *
+ * Example:
+ *	// We do one every second.
+ *	static struct timemono next_timem(void)
+ *	{
+ *		return timemono_add(time_mono(), time_from_msec(1000));
+ *	}
+ */
+static inline struct timemono timemono_add(struct timemono a, struct timerel b)
+{
+	struct timemono t;
+
+	t.ts = time_add_(a.ts, b.ts);
+	return t;
+}
+
 /**
  * timerel_add - add two relative times
  * @a: one relative time.