I'm using UPPAAL for an academic project and I have some questions. I have to design a timed automata so my model has invariants on locations and clock guards on the edges. The problem is I must also verify my model. When I have cheked for deadlock states, before including guards, UPPAAL told me the property was satified. Now that I have add guards (with <=) it tells me the property is not satified so there are states that are not deadlock free. Using diagnostic trace I discovered the problem are the guards with the <= but I can't understand why. Can someone please help me figure it out? ps Sorry for my bad english
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With
x <= Cguard where x is a clock and C is a constant, the system runs into situation where the time has progressed beyond andxis now aboveC, but the guard is disabling the edge, thus the system does not have any edge to execute -- deadlock. To see this, inspect the clock constraints when "deadlock" transition is selected in the symbolic simulator.Here is an example:
This means that the process has no enabled edge and thus deadlock when
x>5(which makes the guard false and disable that edge).The edge transition is still available when
x<=5and the simulator shows that constraint when that transition is selected: