
EBK COMPUTER SYSTEMS
3rd Edition
ISBN: 8220101459107
Author: O'HALLARON
Publisher: YUZU
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Question
Chapter 8, Problem 8.9HW
Program Plan Intro
Given:
Process | Start time | End Time |
A | 5 | 7 |
B | 2 | 4 |
C | 3 | 6 |
D | 1 | 8 |
Expert Solution & Answer

Explanation of Solution
Determine whether the pair of processes run concurrently or not:
Diagram for processes AB:
Explanation:
- In the above timing diagram, process “A” starts with “5” and end with “7”.
- Process “B” starts with “2” and end with “4”.
- Process “A” and “B” are not concurrent with respect to each other because their corresponding executions do not overlap, that is, process “A” completes before process “B” starts.
Therefore, the processes “AB” are do not run concurrently.
Diagram for processes AC:
Explanation:
- In the above timing diagram, process “A” starts with “5” and end with “7”.
- Process “C” starts with “3” and end with “6”.
- Process “A” and “C” are concurrent with respect to each other because their corresponding executions overlap, that is, process “C” starts before the process “A” completes.
Therefore, the processes “AC” are run concurrently.
Diagram for processes AD:
Explanation:
- In the above timing diagram, process “A” starts with “5” and end with “7”.
- Process “D” starts with “1” and end with “8”.
- Process “A” and “D” are concurrent with respect to each other because their corresponding executions overlap, that is, process “D” starts before the process “A” completes.
Therefore, the processes “AD” are run concurrently.
Diagram for processes BC:
Explanation:
- In the above timing diagram, process “B” starts with “2” and end with “4”.
- Process “C” starts with “3” and end with “6”.
- Process “B” and “C” are concurrent with respect to each other because their corresponding executions overlap, that is, process “C” starts before the process “B” completes.
Therefore, the processes “BC” are run concurrently.
Diagram for processes BD:
Explanation:
- In the above timing diagram, process “B” starts with “2” and end with “4”.
- Process “D” starts with “1” and end with “8”.
- Process “B” and “D” are concurrent with respect to each other because their corresponding executions overlap, that is, process “D” starts before the process “B” completes.
Therefore, the processes “BD” are run concurrently.
Diagram for processes CD:
Explanation:
- In the above timing diagram, process “C” starts with “3” and end with “6”.
- Process “D” starts with “1” and end with “8”.
- Process “C” and “D” are concurrent with respect to each other because their corresponding executions overlap, that is, process “D” starts before the process “C” completes.
Therefore, the processes “CD” are run concurrently.
Completed table:
Process pair | Concurrent? |
AB | No |
AC | Yes |
AD | Yes |
BC | Yes |
BD | Yes |
CD | Yes |
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Chapter 8 Solutions
EBK COMPUTER SYSTEMS
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