Problem Solving with C++ (9th Edition)
9th Edition
ISBN: 9780133591743
Author: Walter Savitch
Publisher: PEARSON
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Textbook Question
Chapter 7.1, Problem 4STE
What is the output of the following code?
char symbol [3] = {‘a’, ‘b’, ‘c’};
for (int index = 0; index < 3; index++)
cout << symbol[index];
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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 7 Solutions
Problem Solving with C++ (9th Edition)
Ch. 7.1 - Prob. 1STECh. 7.1 - In the array declaration double score(5); state...Ch. 7.1 - Identity any errors in the following array...Ch. 7.1 - What is the output of the following code? char...Ch. 7.1 - What is the output of the following code? double a...Ch. 7.1 - What is the output of the following code? int i,...Ch. 7.1 - Prob. 7STECh. 7.1 - Suppose we expect the elements of the array a to...Ch. 7.1 - Prob. 9STECh. 7.1 - Suppose you have the following array declaration...
Ch. 7.2 - Consider the following function definition: void...Ch. 7.2 - Prob. 12STECh. 7.2 - Write a function definition for a function called...Ch. 7.2 - Consider the following function definition: void...Ch. 7.2 - Insert const before any of the following array...Ch. 7.2 - Write a function named outOfOrder that takes as...Ch. 7.3 - Write a program that will read up to ten...Ch. 7.3 - Write a program that will read up to ten letters...Ch. 7.3 - Following is the declaration for an alternative...Ch. 7.4 - Prob. 20STECh. 7.4 - Write code that will fill the array a (declared...Ch. 7.4 - Prob. 22STECh. 7 - Write a function named firstLast2 that takes as...Ch. 7 - Write a function named countNum2s that takes as...Ch. 7 - Write a function named swapFrontBack that takes as...Ch. 7 - The following code creates a small phone book. An...Ch. 7 - There are three versions of this project. Version...Ch. 7 - Hexadecimal numerals are integers written in base...Ch. 7 - Solution to Programming Project 7.3 Write a...Ch. 7 - Prob. 4PPCh. 7 - Write a program that reads in a list of integers...Ch. 7 - Prob. 6PPCh. 7 - An array can be used to store large integers one...Ch. 7 - Write a program that will read a line of text and...Ch. 7 - Write a program to score five-card poker hands...Ch. 7 - Write a program that will allow two users to play...Ch. 7 - Write a program to assign passengers seats in an...Ch. 7 - Prob. 12PPCh. 7 - The mathematician John Horton Conway invented the...Ch. 7 - Redo (or do for the first time) Programming...Ch. 7 - Redo (or do for the first time) Programming...Ch. 7 - A common memory matching game played by young...Ch. 7 - Your swim school has two swimming instructors,...Ch. 7 - Your swim school has two swimming instructors,...Ch. 7 - Prob. 19PPCh. 7 - The Social Security Administration maintains an...
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