OR19 P1 P2 OR20 R3 Q P3 P4 R4 O Figure 1: Resource allocation graph 3.2 Is the system in a deadlock? 3.3 If the two units of R2 are allocated to P2 and P3, which processes will be blocke 3.4 If the two units of R2 are allocated to P1 and P2, which processes will be blocke a process is blocked in part 3.1, it remains blocked in parts 3.3 and 3.4.

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
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Subject: Operating Systems

 

Resource allocation graph
A process is blocked if it is requesting a source that is not currently available. Consider the
resource allocation graph of a snapshot of a system in Figure 1 on the next page.
3.1 Are there blocked processes? If yes, which ones?
Transcribed Image Text:Resource allocation graph A process is blocked if it is requesting a source that is not currently available. Consider the resource allocation graph of a snapshot of a system in Figure 1 on the next page. 3.1 Are there blocked processes? If yes, which ones?
OR19
P1
P2
OR₂0
R3 Q
P3
P4
R4
Figure 1: Resource allocation graph
3.2 Is the system in a deadlock?
3.3 If the two units of R2 are allocated to P2 and P3, which processes will be blocked?
3.4 If the two units of R2 are allocated to P1 and P2, which processes will be blocked?
If a process is blocked in part 3.1, it remains blocked in parts 3.3 and 3.4.
Transcribed Image Text:OR19 P1 P2 OR₂0 R3 Q P3 P4 R4 Figure 1: Resource allocation graph 3.2 Is the system in a deadlock? 3.3 If the two units of R2 are allocated to P2 and P3, which processes will be blocked? 3.4 If the two units of R2 are allocated to P1 and P2, which processes will be blocked? If a process is blocked in part 3.1, it remains blocked in parts 3.3 and 3.4.
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