Railway Project 2017
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  • Created by Unknown User (stu114053), last modified on Aug 17, 2017
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Following inputs are used to prevent deadlocks:

  • position and train_on_track
  • pre_next_segment
  • moving
  • locked[NUM_TRACKS][2], currently not working, but implemented

We are preventing deadlocks in the following ways:

  • on full KH, IC, OC or other special cases the trains take an alternative route (route = 1) to prevent deadlocks (f.e. if KH_ST is full and the KIO_LN are occupied by incoming (into KH) trains a train leaving KH should always leave through KH)
  • lock the entrance to KH_LN and KH_LN_REV and the exit of the turnout track if more than two trains travel in the opposite direction of KH
  • a train that is currently in a station,has no destination and is blocking an other train, is given a "random" destination (this is calculated deterministic) to drive to a new station. This can be disabled on each train by setting the no_forced_direction input
  • if the KH_ST is full in one direction the KIO_LN in opposite direction or the exit of the turnout track are locked. What is locked depends on how full KH_LN is and if someone wants to enter from KH_LN (same for REV)
  • a train is never stuck in turnout track, because after five trains passed (waiting_bound_KH in KH_deadlock_prevention.sctx) without the train to leave, the opposite direction is locked so that the train may leave. 
  • it is possible to set a random destination for each train if a train currently doesn't have one, by setting random_mode to true
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