Electronic control unit having reduced inter-object message memory requirements for object-oriented control program

摘要

An electronic control unit that can carry out object-oriented program processing without consuming much memory. When a message is dispatched due to execution of an object method, that message is stored (queued) in an object message holding part. At the point in time when execution of a method of an object finishes, message delivery processing is executed. If a message has been stored in the object message holding part (S210: YES), the number of queuing messages is counted (S220), the one message stored first is read out (S230), and a shift is made to execution of the method of the object that is the output destination of that message (S250, S260). As a result, only messages need to be stored, and the amount of stored information is small.