Question

Does the fact that semaphore manipulation is atomic mean that execution of critical sections is physically atomic?

How about conceptually atomic? Explain in a few sentences.

I need clarification on what physically atomic means. I know that semaphore manipulation is atomic involves controlling processes that as enters a critical section either blocking or allow access to a shared resource.

What does conceptually atomic mean?

Answer 1

semaphore manipulation is atomic mean...

• ​​​​​​​The semaphore operation are implemented as operating system services and so wait and signal are atomic in nature i.e. once started, execution of these operations cannot be interrupted.Thus semaphore is a simple yet powerful mechanism to ensure mutual exclusion among concurrent processes.

A conceptual model is a representation of a system, made of the composition of concepts which are used to help people know, understand, or simulate a subject the model represents. Some models are physical objects; for example, a toy model which may be assembled, and may be made to work like the object it represents.

The main characteristics or goals of a conceptual model are as follows:

• It improves a person's understanding of the subject being modeled.
• It communicates details between people who need to know them.
• It gives a point of reference for people like designers to come up with specific plans.
• It provides a document that can be referred to in the future and used when people work together.