Principles of Information Systems
13th Edition
ISBN: 9781337660556
Author: Ralph Stair; George Reynolds
Publisher: Cengage Learning US
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Chapter 2.4, Problem 1RQ
Program Plan Intro
Shadow IT:
- Shadow IT refers to the information technology projects that are built and deployed without the knowledge of the IT department.
- Shadow IT helps to make businesses more competitive and employers more productive.
- Even though IT is not responsible for the physical structure or managing the application, it is still responsible for ensuring security and compliance for the employees.
- Popular shadow technologies include tablets, personal smartphones, and USB thumb drives and popular shadow applications include instant messaging services, Google Docs, and Skype.
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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
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class Writer(Thread):
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Chapter 2 Solutions
Principles of Information Systems
Ch. 2.1 - Prob. 1RQCh. 2.1 - Prob. 2RQCh. 2.1 - Prob. 1CTQCh. 2.1 - Prob. 2CTQCh. 2.2 - Prob. 1RQCh. 2.2 - Prob. 2RQCh. 2.2 - What questions about this assignment would you...Ch. 2.2 - What actions would you recommend to minimize...Ch. 2.3 - Prob. 1RQCh. 2.3 - Prob. 2RQ
Ch. 2.3 - You have been asked by the human resources...Ch. 2.3 - Prob. 2CTQCh. 2.4 - Prob. 1RQCh. 2.4 - Prob. 2RQCh. 2.4 - Prob. 1CTQCh. 2.4 - Prob. 2CTQCh. 2 - Prob. 1SATCh. 2 - Prob. 2SATCh. 2 - Prob. 3SATCh. 2 - Which of the following is not a true statement...Ch. 2 - Prob. 5SATCh. 2 - Prob. 6SATCh. 2 - of large information system projects fail, at...Ch. 2 - The three stages of Lewins change model include...Ch. 2 - The ____________ change model is helpful in...Ch. 2 - The Bureau of Labor Statistics forecasts an...Ch. 2 - Prob. 11SATCh. 2 - _______________ is a process for testing skills...Ch. 2 - Prob. 1RQCh. 2 - Prob. 2RQCh. 2 - Prob. 3RQCh. 2 - Prob. 4RQCh. 2 - Prob. 5RQCh. 2 - Prob. 6RQCh. 2 - Prob. 7RQCh. 2 - Prob. 8RQCh. 2 - Prob. 9RQCh. 2 - Prob. 10RQCh. 2 - Prob. 11RQCh. 2 - Prob. 12RQCh. 2 - Prob. 13RQCh. 2 - Prob. 1DQCh. 2 - Prob. 2DQCh. 2 - Prob. 3DQCh. 2 - Prob. 4DQCh. 2 - Prob. 5DQCh. 2 - Your manager has asked for your input on ideas for...Ch. 2 - Prob. 7DQCh. 2 - Prob. 8DQCh. 2 - Prob. 9DQCh. 2 - Prob. 10DQCh. 2 - Use graphics software to develop a force field...Ch. 2 - Do research to learn more about GEs Change...Ch. 2 - Prob. 1TACh. 2 - Prob. 2TACh. 2 - Prob. 3TACh. 2 - Prob. 1WECh. 2 - Prob. 2WECh. 2 - Prob. 3WECh. 2 - Prob. 1CECh. 2 - Prob. 2CECh. 2 - Prob. 3CECh. 2 - Prob. 1CTQ1Ch. 2 - Prob. 2CTQ1Ch. 2 - Prob. 3CTQ1Ch. 2 - Prob. 1CTQ2Ch. 2 - Prob. 2CTQ2Ch. 2 - Prob. 3CTQ2
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