@load "time"

# make sure gettimeofday() is consistent with systime().  We must call

# gettimeofday() before systime() to make sure the subtraction gives 0

# without risk of rolling over to the next second.

function timecheck(st,res) {

   res = gettimeofday()

   st = systime()

   printf "gettimeofday - systime = %d\n", res-st

   return res

}

BEGIN {

   delta = 1.3

   t0 = timecheck()

   printf "sleep(%s) = %s\n",delta,sleep(delta)

   t1 = timecheck()

   slept = t1-t0

   if ((slept < 0.9*delta) || (slept > 1.3*delta))

      printf "Warning: tried to sleep %.2f secs, but slept for %.2f secs\n",

	     delta,slept

}