Assume that there are 8 Modules which one of them is Supervisor. They are implemented in C++ classes, so we have 1 Object of Supervisor and more than one Object of other module. The Supervisor assign Tasks to each other module, and whenever they finished their tasks or faced with a problem, they should inform the Supervisor. I think that the best way to implement this behavior is Interruption or something like that. Now, I want to know how to implement it or is there any solution for this problem?