Discovering Computers ©2016 (Shelly Cashman Series) (MindTap Course List)
1st Edition
ISBN: 9781305391857
Author: Misty E. Vermaat, Susan L. Sebok, Steven M. Freund, Jennifer T. Campbell, Mark Frydenberg
Publisher: Cengage Learning
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Chapter 9, Problem 27SG
Program Plan Intro
Password:
- A password should be difficult to guess.
- The length of the password should be minimum 14 characters or more in length.
- It is good if it has uppercase letters, lowercase letters, numbers, and special characters.
- It should not be a familiar word or pharse.
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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)
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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()
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stdout.write(self.n+' reading\n')
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Chapter 9 Solutions
Discovering Computers ©2016 (Shelly Cashman Series) (MindTap Course List)
Ch. 9 - Prob. 1SGCh. 9 - Prob. 2SGCh. 9 - Prob. 3SGCh. 9 - Prob. 4SGCh. 9 - Prob. 5SGCh. 9 - Prob. 6SGCh. 9 - Prob. 7SGCh. 9 - Prob. 8SGCh. 9 - Prob. 9SGCh. 9 - Prob. 10SG
Ch. 9 - Prob. 11SGCh. 9 - Prob. 12SGCh. 9 - Prob. 13SGCh. 9 - Prob. 14SGCh. 9 - Prob. 15SGCh. 9 - Prob. 16SGCh. 9 - Prob. 17SGCh. 9 - Prob. 18SGCh. 9 - Prob. 19SGCh. 9 - Prob. 20SGCh. 9 - Prob. 21SGCh. 9 - Prob. 22SGCh. 9 - Prob. 23SGCh. 9 - Prob. 24SGCh. 9 - Prob. 25SGCh. 9 - Prob. 26SGCh. 9 - Prob. 27SGCh. 9 - Prob. 28SGCh. 9 - Prob. 29SGCh. 9 - Prob. 30SGCh. 9 - Prob. 31SGCh. 9 - Prob. 32SGCh. 9 - Prob. 33SGCh. 9 - Prob. 34SGCh. 9 - Prob. 35SGCh. 9 - Prob. 36SGCh. 9 - Prob. 37SGCh. 9 - Prob. 38SGCh. 9 - Prob. 39SGCh. 9 - Prob. 40SGCh. 9 - Prob. 41SGCh. 9 - Prob. 42SGCh. 9 - Prob. 43SGCh. 9 - Prob. 44SGCh. 9 - Prob. 45SGCh. 9 - Prob. 46SGCh. 9 - Prob. 47SGCh. 9 - Prob. 48SGCh. 9 - Prob. 49SGCh. 9 - Prob. 1TFCh. 9 - Prob. 2TFCh. 9 - Prob. 3TFCh. 9 - Most users today work with a command-line...Ch. 9 - Prob. 5TFCh. 9 - Prob. 6TFCh. 9 - Prob. 7TFCh. 9 - Prob. 8TFCh. 9 - Many of the first operating systems were device...Ch. 9 - Prob. 10TFCh. 9 - Prob. 11TFCh. 9 - Prob. 12TFCh. 9 - Prob. 1MCCh. 9 - Prob. 2MCCh. 9 - Prob. 3MCCh. 9 - A _____operating system allows two or more...Ch. 9 - Prob. 5MCCh. 9 - Prob. 6MCCh. 9 - Prob. 7MCCh. 9 - Prob. 8MCCh. 9 - firmware a. operating system problem that occurs...Ch. 9 - Prob. 2MCh. 9 - thrashing a. operating system problem that occurs...Ch. 9 - Prob. 4MCh. 9 - drive a. operating system problem that occurs when...Ch. 9 - Prob. 6MCh. 9 - Prob. 7MCh. 9 - Prob. 8MCh. 9 - icons a. operating system problem that occurs when...Ch. 9 - Prob. 10MCh. 9 - Prob. 2CTCh. 9 - Prob. 3CTCh. 9 - Prob. 4CTCh. 9 - What is a cross-platform application?Ch. 9 - Prob. 6CTCh. 9 - Prob. 7CTCh. 9 - Prob. 8CTCh. 9 - Prob. 9CTCh. 9 - Prob. 10CTCh. 9 - Prob. 11CTCh. 9 - Prob. 12CTCh. 9 - Prob. 13CTCh. 9 - Prob. 14CTCh. 9 - Prob. 15CTCh. 9 - Prob. 16CTCh. 9 - Prob. 17CTCh. 9 - Prob. 18CTCh. 9 - Prob. 19CTCh. 9 - Prob. 20CTCh. 9 - Prob. 21CTCh. 9 - Prob. 22CTCh. 9 - Prob. 23CTCh. 9 - Prob. 24CTCh. 9 - Prob. 25CTCh. 9 - Prob. 26CTCh. 9 - Prob. 27CTCh. 9 - Prob. 28CTCh. 9 - Prob. 29CTCh. 9 - Prob. 1PSCh. 9 - Prob. 2PSCh. 9 - Prob. 3PSCh. 9 - Prob. 4PSCh. 9 - Prob. 5PSCh. 9 - Prob. 6PSCh. 9 - Prob. 7PSCh. 9 - Prob. 8PSCh. 9 - Prob. 9PSCh. 9 - Prob. 10PSCh. 9 - Prob. 11PSCh. 9 - Prob. 1.1ECh. 9 - Prob. 1.2ECh. 9 - Prob. 1.3ECh. 9 - Prob. 2.1ECh. 9 - Prob. 2.2ECh. 9 - Prob. 2.3ECh. 9 - Prob. 3.1ECh. 9 - Prob. 3.2ECh. 9 - Prob. 3.3ECh. 9 - Prob. 4.1ECh. 9 - Prob. 4.2ECh. 9 - Prob. 4.3ECh. 9 - Prob. 5.1ECh. 9 - Prob. 5.2ECh. 9 - Prob. 5.3ECh. 9 - Prob. 1IRCh. 9 - Prob. 2IRCh. 9 - Prob. 3IRCh. 9 - Prob. 4IRCh. 9 - Prob. 5IRCh. 9 - Prob. 1CTQCh. 9 - Prob. 2CTQCh. 9 - Prob. 4CTQ
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