Problem Solving with C++ plus MyProgrammingLab with Pearson eText-- Access Card Package (9th Edition)
9th Edition
ISBN: 9780133862218
Author: Walter Savitch
Publisher: PEARSON
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Chapter 5, Problem 2P
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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 5 Solutions
Problem Solving with C++ plus MyProgrammingLab with Pearson eText-- Access Card Package (9th Edition)
Ch. 5.1 - What is the output of the following program?...Ch. 5.1 - Are you required to have a return statement in a...Ch. 5.1 - Suppose you omitted the return statement in the...Ch. 5.1 - Prob. 4STECh. 5.1 - Prob. 5STECh. 5.1 - Is a call to a void function used as a statement...Ch. 5.2 - What is the output of the following program?...Ch. 5.2 - What would be the output of the program in Display...Ch. 5.2 - What would be the output of the program in Display...Ch. 5.2 - Prob. 10STE
Ch. 5.2 - Write a void function definition for a function...Ch. 5.2 - Prob. 12STECh. 5.3 - Prob. 13STECh. 5.3 - Prob. 14STECh. 5.3 - Rewrite the function declaration comment for the...Ch. 5.3 - Prob. 16STECh. 5.4 - Prob. 17STECh. 5.4 - Prob. 18STECh. 5.4 - Prob. 19STECh. 5.4 - Prob. 20STECh. 5.4 - Prob. 21STECh. 5.4 - Write a stub for the function whose function...Ch. 5.5 - Prob. 23STECh. 5.5 - Prob. 24STECh. 5.5 - Prob. 25STECh. 5 - Write a function that computes the average and...Ch. 5 - Write a program that reads in a length in feet and...Ch. 5 - Write a program like that of the previous exercise...Ch. 5 - (You should do the previous two Practice Programs...Ch. 5 - Write a program that reads in a weight in pounds...Ch. 5 - Write a program like that of the previous exercise...Ch. 5 - (You should do the previous two Practice Programs...Ch. 5 - (You need to do Practice Programs 4 and 7 before...Ch. 5 - The area of an arbitrary triangle can be computed...Ch. 5 - Write a program that converts from 24-hour...Ch. 5 - Write a program that requests the current time and...Ch. 5 - Modify your program for Programming Project 2 so...Ch. 5 - Write a program that tells what coins to give out...Ch. 5 - In cold weather, meteorologists report an index...Ch. 5 - Prob. 6PPCh. 5 - Write a program that inputs a date (for example,...Ch. 5 - Complete the previous Programming Project and...
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