[LIP] sleep function - perform activity every 10 seconds

Hi,

I have a process which needs to perform an activity
every 10 seconds - starting from the 10 sec boundary.

Excuse my terminology, but this should it make it more clear.

time    activity
-----------------
12:18   process started
12:19   sleep
12:20   ACTIVITY
12:21   sleep
12:22   sleep
.....   .....
12:30   ACTIVITY


Easy to understand. Once the process starts, I get the current time.
Check if the seconds end in digit zero. If yes - perform activity.
sleep 1 second. repeat.

Then i begin to think - why should I execute sleep call every
second when i know the interval? So after first activity, I
modify the sleep interval to 10 seconds. It still works.

Questions:
* I personally prefer calling sleep every second, than doing it
   every 10 seconds. Performance wise - any issues?
* Is the sleep call accurate or does any rounding take place?
   As the 10 second boundary is imperative and not just the interval
   of 10 seconds. i.e. After a sleep call of 10 seconds, am I guaranteed
   that i will land on a 10 second boundary assuming a start at such a
   boundary and that the process needs to be run indefinitely.

I hope I'm clear enough. :-)

--
Rohan








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