COP 4020 Lecture -*- Outline -*-

* Soft real-time programming (4.6) (skip)

------------------------------------------
    SOFT REAL-TIME PROGRAMMING (4.6)

def: A soft real-time program
     has deadlines
     that should be respected
     most of the time.
------------------------------------------

        Hard real time is where can't ever have exceptions

** Basic operations (Time module) (4.6.1)

------------------------------------------
         SOFT REAL-TIME OPERATIONS

{Delay I}
    - waits at least I ms

{Alarm I U}
    - new thread that
      binds U to Unit after at least I ms

{Time.time}
    - number of seconds since current year
------------------------------------------

        Q: How would you write Alarm using Delay?

        See PingPong.oz for the Ping Pong program as a functor (fig 4.30)
        compile it with ozc -x PingPong.oz

        Q: Are there similar things available in Java?

*** ticking (4.6.2)
------------------------------------------
              TICKING

Write NewTicker such that

 {NewTicker}

returns a stream that grows by 1 element
per second
------------------------------------------

        They use Time.time (could also use OS.localTime)

        see the text for various refinements