Starting Out with Programming Logic and Design (4th Edition)
4th Edition
ISBN: 9780133985078
Author: Tony Gaddis
Publisher: PEARSON
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Chapter 10.4, Problem 10.20CP
Explanation of Solution
Record:
Record is a combination of fields. It contains a complete set of data which tells about an item.
Field:
Field is a single piece of record...
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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 10 Solutions
Starting Out with Programming Logic and Design (4th Edition)
Ch. 10.1 - Where are files normally stored?Ch. 10.1 - What is an output file?Ch. 10.1 - What is an input file?Ch. 10.1 - What three steps must be taken by a program when...Ch. 10.1 - Prob. 10.5CPCh. 10.1 - Prob. 10.6CPCh. 10.1 - When writing a program that performs an operation...Ch. 10.1 - In most programming languages, if a file already...Ch. 10.1 - What is the purpose of opening a file?Ch. 10.1 - What is the purpose of closing a file?
Ch. 10.1 - Prob. 10.11CPCh. 10.1 - Prob. 10.12CPCh. 10.1 - What is a files read position? Initially, where is...Ch. 10.1 - In what mode do you open a file if you want to...Ch. 10.2 - Prob. 10.15CPCh. 10.2 - What is the purpose of the eof function?Ch. 10.2 - Is it acceptable for a program to attempt to read...Ch. 10.2 - Prob. 10.18CPCh. 10.2 - Which of the following loops would you use to read...Ch. 10.4 - Prob. 10.20CPCh. 10.4 - Prob. 10.21CPCh. 10.4 - Prob. 10.22CPCh. 10 - A file that data is written to is known as a(n) a....Ch. 10 - A file that data is read from is known as a(n) a....Ch. 10 - Before a file can be used by a program, it must be...Ch. 10 - When a program is finished using a file, it should...Ch. 10 - The contents of this type of file can be viewed in...Ch. 10 - This type of file contains data that has not been...Ch. 10 - When working with this type of file, you access...Ch. 10 - When working with this type of file, you can jump...Ch. 10 - This is a small holding section in memory that...Ch. 10 - Prob. 10MCCh. 10 - This is a character or set of characters that...Ch. 10 - This marks the location of the next item that will...Ch. 10 - When a file is opened in this mode, data will be...Ch. 10 - The expression NOT eof (myFi1e) is equivalent to...Ch. 10 - This is a single piece of data within a record. a....Ch. 10 - When working with a sequential access file, you...Ch. 10 - In most languages, when you open an output file...Ch. 10 - The process of opening a file is only necessary...Ch. 10 - Prob. 4TFCh. 10 - Prob. 5TFCh. 10 - When a file that already exists is opened in...Ch. 10 - In control break logic, the program performs some...Ch. 10 - Describe the three steps that must be taken when a...Ch. 10 - Why should a program close a file when its...Ch. 10 - What is a files read position? Where is the read...Ch. 10 - If an existing file is opened in append mode, what...Ch. 10 - In most languages, if a file does not exist and a...Ch. 10 - What is the purpose of the eof function that was...Ch. 10 - What is control break logic?Ch. 10 - Design a program that opens an output file with...Ch. 10 - Design a program that opens the my_name.dat file...Ch. 10 - Prob. 3AWCh. 10 - Design an algorithm that does the following: opens...Ch. 10 - Modify the algorithm that you designed in question...Ch. 10 - Write pseudocode that opens an output file with...Ch. 10 - Prob. 7AWCh. 10 - A file exists on the disk named students.dat. The...Ch. 10 - Why doesn't the following pseudocode module work...Ch. 10 - File Display Assume that a file containing a...Ch. 10 - Item Counter Assume that a file containing a...Ch. 10 - Sum of Numbers Assume that a file containing a...Ch. 10 - Average of Numbers Assume that a file containing a...Ch. 10 - Largest Number Assume that a file containing a...Ch. 10 - Golf Scores The Springfork Amateur Golf Club has a...Ch. 10 - Sales Report Brewster's Used Cars, Inc. employs...
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