Real-Time Programming Languages - Operating Systems

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Signals ● ● ● ● ● ● Emit x(y): sets signal x present, assigns value y ?σ current value: value just emitted (if so) or value of previous instant (otherwise) pre(?S): previous value Present σ then s1 else s2 end (conditional) Abort S when σ do R end abort; starts S, terminates when σ becomes active, does R Suspend S when σ suspends S when σ active no emission when suspended Trap σ in S end trap starts S, aborts when σ present WS 2013/14 Real-Time Systems, Real-Time Prog. Languages / Hermann Härtig 10
Signals vs Variables 01 Emit Count(pre(?Count) + 1) vs V:= V+1; Gerard Berry Beware: writing “emit COUNT(?COUNT+1)” is tempting but incorrect. Since ?COUNT is the current value of COUNT, it cannot be incremented and reemitted right away as itself. It is necessary to use the previous value pre(?COUNT). WS 2013/14 Real-Time Systems, Real-Time Prog. Languages / Hermann Härtig 11
Page 1 and 2: Real-Time Systems Hermann Härtig R
Page 3 and 4: RT Language Classes Synchronous HLL
Page 5 and 6: Synchronous Systems → Synchronous
Page 7 and 8: Esterel at a glance Most statements
Page 9: Esterel „Data“: Variables and S
Page 13 and 14: Examples (all by Berry): ABRO Speci
Page 15 and 16: Speed Specification SPEED: Count th
Page 17 and 18: Few general points Ada has “Annex
Page 19 and 20: Concurrency Tasks ● ● ● ● a
Page 21 and 22: Termination of Tasks Every task has
Page 23 and 24: The Rendezvous Based on client/serv
Page 25 and 26: In detail task executing Server Cli
Page 27 and 28: Select Statement ● ● Arbitrary
Page 29 and 30: Example: Resource with Locking 01 0
Page 31 and 32: Tasks ./. Protected Objects 01 02 0
Page 33 and 34: Fixed Priorities ● task (type) T
Page 35 and 36: Active Priority Base priority or
Page 37 and 38: EDF Dispatching How to set deadline
Page 39 and 40: Mixed Scheduling Policies, example
Page 41 and 42: Explicit Request Ordering: Requeue
Page 43 and 44: Timing events 01 02 03 04 05 06 07
Page 45 and 46: Example: Watchdog 01 02 03 04 05 06
Page 47 and 48: Time: Delay Statement 01 02 03 04 0
Page 49 and 50: Delay and Select, client side(1) 01
Page 51 and 52: Example 01 02 03 04 05 06 07 select
Page 53 and 54: Example: Operator/Subscriber 01 02
Page 55 and 56: Example: Operator/Subscriber 01 02
Page 57 and 58: Recurrent Tasks (1) 01 02 03 04 05
Page 59 and 60: Recurrent Tasks (3) Periodic tasks
Page 61 and 62:
Example 01 02 03 04 05 06 07 08 09
Page 63 and 64:
Example 01 02 03 04 05 06 07 08 09
Page 65 and 66:
Missing in this RT-HLL lecture ●
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Real-Time Programming Languages - Operating Systems

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