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Alchen [17]
3 years ago
14

If we can lock a file, we can solve the race condition problem by locking a file during the check-and-use window, because no oth

er process can use the file during the time window. Why don’t we use this approach to solve the race condition problems discussed in this chapter?
Computers and Technology
1 answer:
yKpoI14uk [10]3 years ago
5 0

Answer:

A file can only be locked out to other users or processes only if it's already open, meaning it's in use as a resource during the time window and therefore it's impossible solving the race condition problem by locking the file during the check-and-use window.

Hence, during the check-and-use process, it's impossible to lock a file.

In conclusion, any lock created can be ignored by the malicious process.

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3 years ago
Copy the countdown function from Section 5.8 of your textbook. def countdown(n): if n <= 0: print('Blastoff!') else: print(n)
Lapatulllka [165]

Answer:

def countdown(n):

   if n <= 0:

       print('Blastoff!')

   else:

       print(n)

       countdown(n-1)

       

def countup(n):

   if n >= 0:

       print('Blastoff!')

   else:

       print(n)

       countup(n+1)

number = int(input("Enter a number: "))

if number >= 0:

   countdown(number)

elif number < 0:

   countup(number)

<u>Outputs:</u>

Enter a number: 3                                                                                                              

3                                                                                                                              

2                                                                                                                              

1                                                                                                                              

Blastoff!

Enter a number: -3                                                                                                              

-3                                                                                                                              

-2                                                                                                                              

-1                                                                                                                              

Blastoff!

Enter a number: 0

Blastoff!

For the input of zero, the countdown function is called.

Explanation:

Copy the countdown function

Create a function called countup that takes one parameter, n. The function counts up from n to 0. It will print the numbers from n to -1 and when it reaches 0, it will print "Blastoff!".

Ask the user to enter a number

Check if the number is greater than or equal to 0. If it is, call the countdown function. Otherwise, call the countup function.

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