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Petri Nets-Data Dictionary

Petri nets — Formal technique for describing concurrent interrelated activities Consists of four parts (1) A set of places (2) A set of transitions (3) An input function (4) An output function

Petri Nets-Data Dictionary

 

Petri nets — Formal technique for describing concurrent interrelated activities 

Consists of four parts

(1)             A set of places

(2)             A set of transitions

(3)             An input function

(4)             An output function


Originally of interest to automata theorists Found wide applicability in computer science


 


Performance evaluation Operating systems




Marking of a Petri net Assignment of tokens Tokens enable transitions


Petri nets are non-deterministic


 


If more than one transition is able to fire, then any one can be fired


 


Use of inhibitor arcs an important extension: Small circle instead of arrow


A transition is enabled if


 


At least one token is in each of its (normal) input arcs and No tokens on any of its inhibitor input arcs



 


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