Principles of Information Systems
13th Edition
ISBN: 9781337660556
Author: Ralph Stair; George Reynolds
Publisher: Cengage Learning US
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Chapter 3.1, Problem 2RQ
Program Plan Intro
Components of computer:
Computer has four major components, they are:
- Central processing unit (CPU)
- Memory unit
- Input devices
- Output devices
Central Processing Unit (CPU):
- CPU plays the key role in a computer by carrying out instructions of a computer program.
- It performs all the basic logic, arithmetic, controlling and input/output operations that are specified by the instructions.
- The CPU comprises of two units, Arithmetic logic unit (ALU) and control unit (CU).
Memory unit:
- Once computer program instructions set are transformed into machine code by CPU, the machine code is stored in memory.
- Then the CPU fetches the required data and instructions from memory, perform the required operations and then sends the result and next set of instructions back to memory.
Input devices:
- The devices used by the user to feed information to computer, such as a hard drive, keyboard, or a networking card.
- These devices get the data from outside world into computer in the way that human eyes and ears bring the data to brain.
Output devices:
- Output devices are used by computer to deliver the information to the user, such as a monitor, printer, and speaker.
- The CPU takes the machine code present in memory and converts it into a format that is required by monitor’s hardware.
- Then the monitor’s hardware alters that information into different light intensities such that words or pictures are seen.
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Given a shared data set, we allow multiple readers to read at the same time, and only one single writer can access the shared data at the same time. In the lecture slides, a solution is given. However, the problem is that the write cannot write forever, if there are always at least one reader.
How to ensure that the writer can eventually write? Propose your solution by using semaphores and implemented in Python
from threading import Thread, Semaphore
from time import sleep
from sys import stdout
class Reader(Thread):
def__init__(self, name):
self.n=name; Thread.__init__(self)
defrun(self):
globalnr, nw, dr, dw
whileTrue:
# ⟨await nw == 0 then nr += 1⟩
e.acquire()
ifnw>0:
#if nw > 0 or dw > 0 :
dr+=1; e.release(); r.acquire()
nr+=1
ifdr>0: dr-=1; r.release()
else: e.release()
# read data
stdout.write(self.n+' reading\n')
sleep(1)
# ⟨nr -= 1⟩
e.acquire()
nr-=1
ifnr==0anddw>0:
dw-=1 ; w.release()
else: e.release()
class Writer(Thread):
def__init__(self, name):…
Chapter 3 Solutions
Principles of Information Systems
Ch. 3.1 - Prob. 1RQCh. 3.1 - Prob. 2RQCh. 3.1 - Prob. 1CTQCh. 3.1 - Prob. 2CTQCh. 3.2 - Prob. 1RQCh. 3.2 - Prob. 2RQCh. 3.2 - Prob. 1CTQCh. 3.2 - Prob. 2CTQCh. 3.3 - Prob. 1RQCh. 3.3 - Prob. 2RQ
Ch. 3.3 - Prob. 1CTQCh. 3.3 - Prob. 2CTQCh. 3 - Prob. 1SATCh. 3 - Prob. 2SATCh. 3 - Prob. 3SATCh. 3 - Prob. 4SATCh. 3 - Prob. 5SATCh. 3 - LI is the fastest type of cache memory built into...Ch. 3 - Prob. 7SATCh. 3 - Prob. 8SATCh. 3 - Prob. 9SATCh. 3 - Prob. 10SATCh. 3 - Prob. 11SATCh. 3 - Prob. 12SATCh. 3 - A _________ is a low-cost, centrally managed...Ch. 3 - Prob. 14SATCh. 3 - Prob. 15SATCh. 3 - Prob. 16SATCh. 3 - Prob. 17SATCh. 3 - Identify four fundamental components of every...Ch. 3 - What is the purpose of the computer bus?Ch. 3 - Prob. 3RQCh. 3 - Prob. 4RQCh. 3 - Prob. 5RQCh. 3 - Prob. 6RQCh. 3 - Prob. 7RQCh. 3 - Prob. 8RQCh. 3 - Prob. 9RQCh. 3 - Prob. 10RQCh. 3 - Prob. 11RQCh. 3 - Prob. 12RQCh. 3 - Prob. 13RQCh. 3 - Prob. 14RQCh. 3 - Prob. 15RQCh. 3 - Prob. 16RQCh. 3 - Prob. 17RQCh. 3 - Prob. 18RQCh. 3 - Prob. 1DQCh. 3 - Prob. 2DQCh. 3 - Prob. 3DQCh. 3 - Prob. 4DQCh. 3 - Prob. 5DQCh. 3 - Prob. 6DQCh. 3 - Prob. 7DQCh. 3 - Prob. 8DQCh. 3 - Prob. 9DQCh. 3 - Prob. 10DQCh. 3 - Prob. 11DQCh. 3 - Prob. 12DQCh. 3 - Prob. 13DQCh. 3 - Prob. 3PSECh. 3 - Prob. 1TACh. 3 - Prob. 2TACh. 3 - Prob. 1WECh. 3 - Prob. 2WECh. 3 - Prob. 3WECh. 3 - Prob. 1CECh. 3 - Prob. 2CECh. 3 - Prob. 3CECh. 3 - Prob. 1CTQ1Ch. 3 - Prob. 2CTQ1Ch. 3 - Prob. 3CTQ1Ch. 3 - Prob. 1CTQ2Ch. 3 - Prob. 2CTQ2Ch. 3 - Prob. 3CTQ2
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