Add function to convert millisec into ticks

src/clocks.c

@@ -216,6 +216,25 @@ double clocks_from_ticks(ticks tics) {
   return ((double)tics / (double)clocks_get_cpufreq() * clocks_units_scale);
 }
 
+/**
+ * @brief Convert a number of milli seconds into ticks, if possible.
+ *
+ * Only an approximation as based on how well we have estimated the
+ * rtc frequency. Should be good for machines that support constant_rtc
+ * and clock_gettime(), and reasonable for most Linux machines, otherwise
+ * a guess will just be returned. See clocks_getunit() for the actual units.
+ *
+ * @param ms a number of "milliseconds" to convert to ticks
+ *
+ * @result the number of ticks, if possible.
+ */
+ticks clocks_to_ticks(double ms) {
+    return (ticks) (ms * (double)clocks_get_cpufreq() / clocks_units_scale);
+}
+
+ticks clocks_to_ticks(double interval);
+
+
 /**
  * @brief return the time units.
  *

src/clocks.h

@@ -39,6 +39,7 @@ const char *clocks_getunit();
 void clocks_set_cpufreq(unsigned long long freq);
 unsigned long long clocks_get_cpufreq();
 double clocks_from_ticks(ticks tics);
+ticks clocks_to_ticks(double interval);
 double clocks_diff_ticks(ticks tic, ticks toc);
 const char *clocks_get_timesincestart();