EBK STARTING OUT WITH PROGRAMMING LOGIC
5th Edition
ISBN: 8220106960493
Author: GADDIS
Publisher: PEARSON
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Chapter 3.5, Problem 3.20CP
Give one good reason that you should not use global variables in a
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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):
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Chapter 3 Solutions
EBK STARTING OUT WITH PROGRAMMING LOGIC
Ch. 3.1 - What is a module?Ch. 3.1 - Prob. 3.2CPCh. 3.1 - Prob. 3.3CPCh. 3.1 - Prob. 3.4CPCh. 3.1 - Prob. 3.5CPCh. 3.2 - In most languages, a module definition has what...Ch. 3.2 - Prob. 3.7CPCh. 3.2 - Prob. 3.8CPCh. 3.2 - Prob. 3.9CPCh. 3.3 - What is a local variable? How is access to a local...
Ch. 3.3 - What is a variables scope?Ch. 3.3 - Prob. 3.12CPCh. 3.3 - Prob. 3.13CPCh. 3.4 - Prob. 3.14CPCh. 3.4 - What are the variables that receive pieces of data...Ch. 3.4 - Prob. 3.16CPCh. 3.4 - Prob. 3.17CPCh. 3.4 - Prob. 3.18CPCh. 3.5 - What is the scope of a global variable?Ch. 3.5 - Give one good reason that you should not use...Ch. 3.5 - Prob. 3.21CPCh. 3 - A group of statements that exist within a program...Ch. 3 - Prob. 2MCCh. 3 - The first line of a module definition is known as...Ch. 3 - Prob. 4MCCh. 3 - Prob. 5MCCh. 3 - A design technique that programmers use to break...Ch. 3 - Prob. 7MCCh. 3 - A _____ is a variable that is declared inside a...Ch. 3 - A(n) ____ is the part of a program in which a...Ch. 3 - A(n) ____ is a piece of data that is sent into a...Ch. 3 - A(n) ____ is a special variable that receives a...Ch. 3 - When _____, only a copy of the argument's value is...Ch. 3 - When ____, the module can modify the argument in...Ch. 3 - A variable that is visible to every module in the...Ch. 3 - When possible, you should avoid using _____...Ch. 3 - The phrase divide and conquer means that all of...Ch. 3 - Prob. 2TFCh. 3 - Module names should be as short as possible.Ch. 3 - Prob. 4TFCh. 3 - A flowchart shows the hierarchical relationships...Ch. 3 - Prob. 6TFCh. 3 - A statement in one module can access a local...Ch. 3 - In most programming languages, you cannot have two...Ch. 3 - Programming languages typically require that...Ch. 3 - Most languages do not allow you to write modules...Ch. 3 - When an argument is passed by reference, the...Ch. 3 - Prob. 12TFCh. 3 - Prob. 1SACh. 3 - Prob. 2SACh. 3 - Prob. 3SACh. 3 - What is a local variable? What statements are able...Ch. 3 - In most languages, where does a local variables...Ch. 3 - What is the difference between passing an argument...Ch. 3 - Prob. 7SACh. 3 - Design a module named timesTen. The module should...Ch. 3 - Examine the following pseudocode module header,...Ch. 3 - Look at the following pseudocode module header:...Ch. 3 - Assume that a pseudocode program contains the...Ch. 3 - Design a module named getNumber, which uses a...Ch. 3 - What will the following pseudocode program...Ch. 3 - What will the following pseudocode program...Ch. 3 - Find the error in the following pseudocode. Module...Ch. 3 - Find the error in the following pseudocode. Module...Ch. 3 - Find the potential error in the following...Ch. 3 - Prob. 4DECh. 3 - Kilometer Converter Design a modular program that...Ch. 3 - Prob. 2PECh. 3 - How Much Insurance? Many financial experts advise...Ch. 3 - Prob. 4PECh. 3 - Prob. 5PECh. 3 - Prob. 6PECh. 3 - Calories from Fat and Carbohydrates A nutritionist...Ch. 3 - Prob. 8PECh. 3 - Prob. 9PECh. 3 - Monthly Sales Tax A retail company must file a...Ch. 3 - Prob. 11PE
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