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Train Gate System. A one-directional railway track crosses a road A gate at the crossing may be lowered or raised under computer control A short distance from the crossing a sensor detects entering trains A short distance from the crossing a sensor detects leaving trains.

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train gate system
Train Gate System
  • A one-directional railway track crosses a road
  • A gate at the crossing may be lowered or raised under computer control
  • A short distance from the crossing a sensor detects entering trains
  • A short distance from the crossing a sensor detects leaving trains.
physical requirements
Physical Requirements
  • The gate must be closed whenever there are trains in the area
  • The gate must be kept open when there are no trains in the area
timing requirements
Timing Requirements
  • The arriving trains have an average inter-arrival period, avgP
  • The gate takes z time units to close (or open).
simulation outputs
Simulation Outputs
  • Trace of events
  • Performance measures
    • Number of trains serviced
    • Worst reaction time
    • Worst response time
    • Number of deadlines missed:
      • Gate opening/closing
      • Communication timeouts
train control
Train Control
  • A physical safety requirement of the system is that the gate is closed whenever there are trains in the area
  • The physical liveness requirement is to keep the gate open if there are no trains in the area
  • The controller C controls the gate with the openg (og) and closeg (cg) commands.
timeouts
Timeouts
  • Activity timeouts
  • Communications timeout
activity timeouts
Activity Timeouts
  • The Gate takes a maximum of z time units to close or to open
  • The controller process normally waits for the Gate to open or close
  • If the Gate takes longer than the maximum allocated time, the controller flags a timeout for the gate and triggers an alarm
communication timeouts
Communication Timeouts
  • The real-time systems uses synchronous communications
  • In the normal case, one of the processes, either the sender or the receiver, will wait for the other to establish the communication
  • A communication timer object will interrupt a process attempting to communicate, on timeout.
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