lib/util: add nsec_time_diff to calulate diffs from timespecs

2 files changed, 14 insertions, 0 deletions

diff --git a/lib/util/time.c b/lib/util/time.c
index 5557346b9b..5ecf93cb77 100644
--- a/lib/util/time.c
+++ b/lib/util/time.c
@@ -409,6 +409,15 @@ _PUBLIC_ int64_t usec_time_diff(const struct timeval *tv1, const struct timeval
 	return (sec_diff * 1000000) + (int64_t)(tv1->tv_usec - tv2->tv_usec);
 }
 
+/**
+  return (tp1 - tp2) in microseconds
+*/
+_PUBLIC_ int64_t nsec_time_diff(const struct timespec *tp1, const struct timespec *tp2)
+{
+	int64_t sec_diff = tp1->tv_sec - tp2->tv_sec;
+	return (sec_diff * 1000000000) + (int64_t)(tp1->tv_nsec - tp2->tv_nsec);
+}
+
 
 /**
   return a zero timeval
diff --git a/lib/util/time.h b/lib/util/time.h
index 90890cdbc8..720a262b29 100644
--- a/lib/util/time.h
+++ b/lib/util/time.h
@@ -149,6 +149,11 @@ _PUBLIC_ NTTIME nttime_from_string(const char *s);
 _PUBLIC_ int64_t usec_time_diff(const struct timeval *tv1, const struct timeval *tv2);
 
 /**
+  return (tp1 - tp2) in nanoseconds
+*/
+_PUBLIC_ int64_t nsec_time_diff(const struct timespec *tp1, const struct timespec *tp2);
+
+/**
   return a zero timeval
 */
 _PUBLIC_ struct timeval timeval_zero(void);