Week 5 Processes and scheduling

22問 • 11ヶ月前

問題一覧

Which of the following statements best describes a process?

An active entity representing a program in execution.

The ______ section of a process's memory layout contains global and static variables.

Data

The ___ section of a process’s memory layout contains temporary data storage for function calls (parameters, return addresses, local variables).

Stack

All of the followings are typically stored in a Provess Control Block (PCB) except:

CPU manufacturer’s name

A process that is currently waiting for an I/O operation to complete is in the ______ state.

Waiting (Blocked)

What is the primary purpose of multitasking (or time-sharing) in an operating system?

To give the illusion that multiple processes are running concurrently on a single CPU.

The process of saving the state of the current running process and restoring the state of another process is called:

Context switching

Which OS component is responsible for selecting which process from the Ready queue should be allocated the CPU?

Scheduler

Why are system calls necessary for user programs?

To request services from the operating system kernel that require privileged access.

When the CPU is executing user applications and has restricted access to hardware and memory, it is operating in:

User mode

A ______ is a signal that causes the CPU to suspend its current execution and transfer control to a special handler routine.

Interrupt

A "trap" or "exception" (e.g., division by zero) is a type of:

Software-generated interrupt

The ______ is a table of pointers that the CPU uses to find the correct handler routine when an interrupt occurs.

Interrupt Vector (or Interrupt table)

In a time-sharing operating system, when the time slot given to a process is completed, the process goes from the running state to the ________

Ready state

Suppose that a process is in “Blocked” state waiting for some I/O service. When the service is completed, it goes to the __________

Ready state

Which one of the following is not a condition for process state transition from running state to wait state?

If a lower priority process arrived

Consider the following statements about process state transitions for a system using preemptive scheduling. I. A running process can move to ready state. Il. A ready process can move to running state. IlI. A blocked process can move to running state. IV. A blocked process can move to ready state. Which of the above statements are TRUE?

I, II, and IV only

Suppose that a process is in 'BLOCKED' state waiting for some I/0 service. When the service is completed, it goes to the ____ state.

ready

Process is in a ready state ____

when process is scheduled to run after some execution

The maximum number of processes that can be in running state with 1 CPU and n process in a ready state for a computer system is

look at the image to ans the qns

2, 3 and 5

As process enter the system, they are put into ____ which consists of all the processes in the system.

job queue

1.1: Software life cycle

ユーザ名非公開 · 17問 · 2年前

1.1: Software life cycle