--- Sending of agreed message followed by safe message followed by
--- network partition.  Agreed message gets lost, cannot be recovered
--- and blocks delivery of safe message at c. Since c cannot deliver
--- the safe message it does not send acks. Hence, a and b can only
--- deliver the safe message in the smaller transitional
--- configuration.  Finally, c delivers the safe message in the
--- transitional configuration as well, because gaps (here concerning
--- the lost agreed message are admitted here).

--- See delivered(proc,...) in the corresponding .out-file for the messages
--- delivered to the upper layer at proc.

in test.maude

mod TEST13 is

protecting TEST .

eq allprocs = sProcSet(proc("a")) sProcSet(proc("b")) sProcSet(proc("c")) .

--- initial state 

op start : -> State .
eq start =

    network(allprocs)
    mkinitialconf(allprocs)
    mkinitialprocs(allprocs)

    multicast-req(proc("b"), agreed, data("test1")) 
    multicast-req(proc("a"), safe, data("test2")) 

    CONTROLLER(

      PERFORM(SEND(proc("b"),0)) ;     
      PERFORM(RECEIVE(proc("a"),0)) ;  
      PERFORM(RECEIVE(proc("b"),0)) ;  

      PERFORM(SEND(proc("a"),1)) ;     
      PERFORM(RECEIVE(proc("a"),1)) ;  
      PERFORM(RECEIVE(proc("b"),1)) ;  
      PERFORM(RECEIVE(proc("c"),1)) ;  

      PERFORM(RECEIVE(proc("a"),2)) ;  

      PERFORM(RECEIVE(proc("a"),3)) ;  
      PERFORM(RECEIVE(proc("b"),3)) ;  
      PERFORM(RECEIVE(proc("c"),3)) ;  

      ( PERFORM(CHANGE(proc("a"),(sProcSet(proc("a")) sProcSet(proc("b"))))) || --- a receives conf change
        PERFORM(CHANGE(proc("b"),(sProcSet(proc("a")) sProcSet(proc("b"))))) || --- b receives conf change
        PERFORM(CHANGE(proc("c"),sProcSet(proc("c"))))    --- c receives conf change
      ) ;

      PERFORM(LOSE(proc("c"),0)) ;  --- lost

      ( PERFORM(EVS-START(proc("a"),true)) ||
        PERFORM(EVS-START(proc("b"),true)) ||
        PERFORM(EVS-START(proc("c"),true)) ) --- a, b finish sucessfully

      )

      .


endm

rew start .
--- search start =>! state:State .