Implement a system of three processes which read and write sequence numbers to a file. Each of the three processes P1, P2, and P3 must obtain 200 integers from the file. The file only holds one integer at any given time. Given a file, F, containing a single integer, each process must perform the following steps: 1. Open F 2. Read the integer N from the file 3. Close F 4. Output N and the process' PID (either on screen or test file) 5. Increment N by 1 6. Open F 7. Write N to F (overwriting the current value in F) 8. Close F. Will the numbers that are read by the processes P1, P2, and P3 be always unique, or do you observe duplicates of numbers being obtained by different processes (i.e., does a particular integer x appear in the output of more than on process)? Rewrite your implementation of these 3 processes to guarantee that no duplicate numbers are ever obtained by the processes. In other words, each time the file is read by any process, that process reads a distinct integer. Briefly describe why the code sequence above can lead to duplication of integer values and discuss how your solution will avoid these duplicates.
Implement a system of three processes which read and write sequence numbers to a file. Each of the three processes P1, P2, and P3 must obtain 200 integers from the file. The file only holds one integer at any given time. Given a file, F, containing a single integer, each process must perform the following steps: 1. Open F 2. Read the integer N from the file 3. Close F 4. Output N and the process' PID (either on screen or test file) 5. Increment N by 1 6. Open F 7. Write N to F (overwriting the current value in F) 8. Close F. Will the numbers that are read by the processes P1, P2, and P3 be always unique, or do you observe duplicates of numbers being obtained by different processes (i.e., does a particular integer x appear in the output of more than on process)? Rewrite your implementation of these 3 processes to guarantee that no duplicate numbers are ever obtained by the processes. In other words, each time the file is read by any process, that process reads a distinct integer. Briefly describe why the code sequence above can lead to duplication of integer values and discuss how your solution will avoid these duplicates.
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
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Transcribed Image Text:Implement a system of three processes which read and write sequence numbers to a file. Each of
the three processes P1, P2, and P3 must obtain 200 integers from the file. The file only holds one
integer at any given time. Given a file, F, containing a single integer, each process must perform the
following steps:
1. Open F
2. Read the integer N from the file
3. Close F
4. Output N and the process' PID (either on screen or test file)
5. Increment N by 1
6. Open F
7. Write N to F (overwriting the current value in F)
8. Close F.
Will the numbers that are read by the processes P1, P2, and P3 be always unique, or do you observe
duplicates of numbers being obtained by different processes (i.e., does a particular integer x appear
in the output of more than on process)?
Rewrite your implementation of these 3 processes to guarantee that no duplicate numbers are ever
obtained by the processes. In other words, each time the file is read by any process, that process
reads a distinct integer.
Briefly describe why the code sequence above can lead to duplication of integer values and discuss
how your solution will avoid these duplicates.
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