1. Орen 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. Орen F 7. Write N to F (overwriting the current value in F) 8. Close F.
1. Орen 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. Орen F 7. Write N to F (overwriting the current value in F) 8. Close F.
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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PLEASE HELP ME WITH THIS ALL. I WILL GIVE YOU THUMBS IF YOU GIVE ME ALL ANSWER WITH CORRECT ANSWER. PLEASE ANSWER THIS ON YOU OWN WORD ANSWER.
Transcribed Image Text:3. 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. Оpen F
2. Read the integer N from the file
3. Close F
4. Output Nand the process' PID (either on screen or test file)
5. Increment N by 1
6. Оpen 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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