Com S 541 Lecture -*- Outline -*-

* Soft real-time programming (4.6)

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    SOFT REAL-TIME PROGRAMMING (4.6)

def: A soft real-time program
     has deadlines
     that need to be respected
     most of the time.
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        Hard real time is where can't ever have exceptions

** Basic operations (Time module) (4.6.1)

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         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
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        Q: How owuld 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

*** ticking (4.6.2)
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              TICKING

Write NewTicker such that

 {NewTicker}

returns a stream that grows by 1 element
per second
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        They use OS.localTime

        see the text for various refinements