cycle timer not working

component time "Time on in Hours, Minutes, Seconds";

description 
"""
Time

When the time.N.start bit goes true the cycle timer resets and starts
to time until time.N.start goes false. If you connect time.N.start to
halui.is-running as a cycle timer it will reset during a pause. See
the example connections below to keep the timer timing during a pause.

Time returns the hours, minutes, and seconds that time.N.start is true.

Sample pyVCP code to display the hours:minutes:seconds.

<pyvcp>
  <hbox>
  <label>
    <text>"Cycle Time"</text>
    <font>("Helvetica",14)</font>
  </label>
  <u32> 
      <halpin>"time-hours"</halpin>
      <font>("Helvetica",14)</font>
      <format>"2d"</format>
  </u32>
  <label>
    <text>":"</text>
    <font>("Helvetica",14)</font>
  </label>
  <u32> 
      <halpin>"time-minutes"</halpin>
      <font>("Helvetica",14)</font>
      <format>"2d"</format>
  </u32>
  <label>
    <text>":"</text>
    <font>("Helvetica",14)</font>
  </label>
  <u32> 
      <halpin>"time-seconds"</halpin>
      <font>("Helvetica",14)</font>
      <format>"2d"</format>
  </u32>
  </hbox>
</pyvcp>

In your post-gui.hal file you might use the following to connect it up

 loadrt time
 loadrt not
 addf time.0 servo-thread
 addf not.0 servo-thread
 net prog-running not.0.in <= halui.program.is-idle
 net cycle-timer time.0.start <= not.0.out
 net cycle-seconds pyvcp.time-seconds <= time.0.seconds
 net cycle-minutes pyvcp.time-minutes <= time.0.minutes
 net cycle-hours pyvcp.time-hours <= time.0.hours

""";
 
author "John Thornton";

license "GPL";

// Input Pins
pin in bit start "Timer On";

// Output Pins
pin out u32 seconds "Seconds";
pin out u32 minutes "Minutes";
pin out u32 hours "Hours";

// Global Variables
variable double totalnsec;
variable int old_start;

function _;

;;

#include "rtapi_math.h"

FUNCTION(_) {
    __u32 totalseconds; 
    if(start && !old_start) totalnsec = 0;

    if(start){
    totalnsec = totalnsec + period;
    totalseconds = totalnsec * 0.000000001;
    seconds = totalseconds % 60;
	minutes = (totalseconds / 60) % 60;
	hours = (totalseconds / 3600);
	}
	old_start = start;
}