Operating Systems

Question 1

Middleware

Answer 1

Software that acts as a bridge between an operating system or database and applications , especially on a network

Question 2

Operating System

Answer 2

it’s basically the piece of system software that manages computer hardware and the rest of the software

Question 3

Stack

Answer 3

a stack,which stores local variables
A stack frame is created/pushed whenever a function is called
A stack frame is deleted/popped whenever a function returns .

Question 4

Heap

Answer 4

A heap , for dynamically allocated memory(typically handled by libc)
one can request memory for an object(contiguous chunk of bytes )

one should declare when an object is not in use anymore ,so memory can be reclaimed

Question 5

Threads

Answer 5

“Threads are independent units of computation (sequences of instructions, plus some small context) that can be scheduled for execution on a CPU.
The scheduler is part of the operating system.
Threads are created within a process, and share the same process address space (i.e. two threads could modify the same variable in a process).”

Question 6

Why are threads needed?

Answer 6

-to enhance parralel processing
-to increase response to the user
-to utilise the idle time of the cpu