Signal and reception are the basic model of asynchronous communication

Card Puncher Data Processing


Signals and Receptions are used to model asynchronous communication between entity.

A Signal is a specification of a kind of communication between objects in which a reaction is asynchronously triggered in the receiver without a reply.

The sender of a Signal will not block waiting for a reply but continue execution immediately.

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Data System Architecture
Logical Data Modeling - Entity (Row | Tuple | Member | Unit | Instance )

An entity isone thing which can be distinctly identified. Example: A specific person A specific company A specific group of persons, A specific place, A specific event It's a concept to...
Process States
Signal in Operating System

Signal has been borrowed from the modeling of process and are used for process communication

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