The following diagram shows the process_state and other_resources fields of 4 processes in the PCB array. The RCB array shows the state and the waiting list of 4 resources. The ready list RL contains processes 1 then 0. Consider (1), (2) as independent operations. PCB 0 PCB 1 PCB 2 PCB 3 process state ready other_resources *** waiting list *** *** state allocated RCB 0 2 *** *** *** running *** RCB 1 free (1) Process 1 requests resource 1. After the operation: Process 1 is Select Resource 1 is Select *** (2) Process 1 requests resource 3. After the operation: Process 1 is Select Resource 3 is Select blocked *** *** RCB 2 allocated *** 0-0 3 2 blocked *** RCB 3 allocated *** Resource 1's waiting list Select RL contains the processes Ex: 1,2,3 Resource 3's waiting list Select RL contains the processes Ex: 1,2,3 -3-0 Ⓒ
The following diagram shows the process_state and other_resources fields of 4 processes in the PCB array. The RCB array shows the state and the waiting list of 4 resources. The ready list RL contains processes 1 then 0. Consider (1), (2) as independent operations. PCB 0 PCB 1 PCB 2 PCB 3 process state ready other_resources *** waiting list *** *** state allocated RCB 0 2 *** *** *** running *** RCB 1 free (1) Process 1 requests resource 1. After the operation: Process 1 is Select Resource 1 is Select *** (2) Process 1 requests resource 3. After the operation: Process 1 is Select Resource 3 is Select blocked *** *** RCB 2 allocated *** 0-0 3 2 blocked *** RCB 3 allocated *** Resource 1's waiting list Select RL contains the processes Ex: 1,2,3 Resource 3's waiting list Select RL contains the processes Ex: 1,2,3 -3-0 Ⓒ
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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