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[gnulib.git] / lib / timespec.h

diff --git a/lib/timespec.h b/lib/timespec.h
index 175de7f..acf815c 100644 (file)
--- a/lib/timespec.h
+++ b/lib/timespec.h
@@ -1,6 +1,6 @@
 /* timespec -- System time interface
 
-   Copyright (C) 2000, 2002, 2004-2005, 2007, 2009-2010 Free Software
+   Copyright (C) 2000, 2002, 2004-2005, 2007, 2009-2011 Free Software
    Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
@@ -57,6 +57,25 @@ timespec_cmp (struct timespec a, struct timespec b)
           : (int) (a.tv_nsec - b.tv_nsec));
 }
 
+/* Return -1, 0, 1, depending on the sign of A.  A.tv_nsec must be
+   nonnegative.  */
+static inline int
+timespec_sign (struct timespec a)
+{
+  return a.tv_sec < 0 ? -1 : a.tv_sec || a.tv_nsec;
+}
+
+struct timespec timespec_add (struct timespec, struct timespec);
+struct timespec timespec_sub (struct timespec, struct timespec);
+struct timespec dtotimespec (double);
+
+/* Return an approximation to A, of type 'double'.  */
+static inline double
+timespectod (struct timespec a)
+{
+  return a.tv_sec + a.tv_nsec / 1e9;
+}
+
 void gettime (struct timespec *);
 int settime (struct timespec const *);