Processes (Part III)

Question 1

It controls all the events within a computer. It schedules and dispatches processes for execution by the processor, allocates resources to different processes, and responds to requests by user processes for basic services

Answer 1

Operating System (OS)

Question 2

What are the four (4) different types of tables maintained by an operating system?

Answer 2

• Memory tables
• I/0 tables
• File tables
• Process tables

Question 3

These are used to keep track of both the main and secondary memory. A part of the main memory is reserved for OS utilization, while the remaining parts are available for the processes’ utilization

Answer 3

Memory table

Question 4

These are used by the OS to manage the input and output devices and channels of a computer system at any given point of time

Answer 4

I/O tables

Question 5

These tables hold information regarding the existence of files and its corresponding attributes through a file management system

Answer 5

File tables

Question 6

These tables are maintained by the OS to manage processes

Answer 6

Process tables

Question 7

At a minimum, a process must include a program to be executed. Associated to this program is a set of data locations for local and global variables and any defined constants

Answer 7

Process location

Question 8

A multiprogramming system requires a great deal of information about each process that resides in a process control block. There are different types of information that might be of use to an OS without considering any details as to how that information is organized

Answer 8

Process Attributes

Question 9

The information in a process control block can be grouped into three (3) categories:

Answer 9

• Process identification
• Process state information
• Process control information

Question 10

This involves unique numeric identifies that are assigned to specific processes, which can simply be an index into a primary process table, or identifies for cross-referencing process tables

Answer 10

Process identification

Question 11

This consists of processor registers’ information. During process execution, information is are the registers

Answer 11

Process state information

Question 12

This contains the additional information needed by the OS to control and coordinate various active processes, such as the data structure, resource ownership and utilization information, and process privileges

Answer 12

Process control information

Question 13

This is referred to as the less-privileged mode, since user programs execute in this mode

Answer 13

User mode

Question 13

Specific processes require certain privileges in order to protect the hardware and the OS from impending malfunction

Answer 13

Modes of Execution

Question 14

This is referred to as the more-privileged mode, where the software has complete control of the processor and its instructions, registers, and memory

Answer 14

Kernel mode

Question 15

When a new process is to be added to those currently being managed, the operating system builds the data structure that will manage the process and allocates address space in the main memory for the process

Answer 15

Process creation

Question 16

When the operating system controls the currently running processes, a process switch may occur at any time. Thus, the OS needs to provide a regaining control feature if a process is blocked, suspended, or paused

Answer 16

Process Switching

Question 17

These are external events that are independent of the currently running process

Answer 17

Interrupts

Question 18

Is related to errors or exception conditions generated within the currently running process

Answer 18

Traps

Question 19

Due to an explicit request can still occur to interrupt a process execution

Answer 19

Supervisor call