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We want to use semaphores to implement a shared critical section (CS) among three threads T1, T2, and T3. We want to enforce the execution in the CS in this order: First T2 must execute in the CS. When it finishes, T1 will then be allowed to enter the CS; and when it finishes T3 will then be allowed to enter the CS; when T3 finishes then T2 will be allowed to enter the CS, and so on, (T2, T1, T3, T2, T1, T3, ...) 7.1. What is the minimal number of semaphores we need in order to implement this ordering and mutual exclusion; and what are their initial values. 7.2. Insert the appropriate instructions and the P() and V() operations in the appropriate places in the pseudo-code below to fulfil this ordered execution. While(TRUE) } TI CS; 12 While(TRUE){ 7 While(TRUE) } T3 CS;

We want to use semaphores to implement a shared critical section (CS) among three threads T1, T2, and T3. We want to enforce the execution in the CS in this order: First T2 must execute in the CS. When it finishes, T1 will then be allowed to enter the CS; and when it finishes T3 will then be allowed to enter the CS; when T3 finishes then T2 will be allowed to enter the CS, and so on, (T2, T1, T3, T2, T1, T3, ...) 7.1. What is the minimal number of semaphores we need in order to implement this ordering and mutual exclusion; and what are their initial values. 7.2. Insert the appropriate instructions and the P() and V() operations in the appropriate places in the pseudo-code below to fulfil this ordered execution. While(TRUE) } TI CS; 12 While(TRUE){ 7 While(TRUE) } T3 CS;

Database System Concepts
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
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7. We want to use semaphores to implement a shared critical section (CS) among three threads T1, T2, and T3. We want to enforce the execution in the CS in this order: First T2 must execute in the CS. When it finishes, T1 will then be allowed to enter the CS; and when it finishes T3 will then be allowed to enter the CS; when T3 finishes then T2 will be allowed to enter the CS, and so on, (T2, T1, T3, T2, T1, T3, ...) 7.1. What is the minimal number of semaphores we need in order to implement this ordering and mutual exclusion; and what are their initial values. 7.2. Insert the appropriate instructions and the P() and V() operations in the appropriate places in the pseudo-code below to fulfil this ordered execution. While(TRUE) } TI CS; While(TRUE){ 7 12 cs; T3 While(TRUE){ 7
Transcribed Image Text:7. We want to use semaphores to implement a shared critical section (CS) among three threads T1, T2, and T3. We want to enforce the execution in the CS in this order: First T2 must execute in the CS. When it finishes, T1 will then be allowed to enter the CS; and when it finishes T3 will then be allowed to enter the CS; when T3 finishes then T2 will be allowed to enter the CS, and so on, (T2, T1, T3, T2, T1, T3, ...) 7.1. What is the minimal number of semaphores we need in order to implement this ordering and mutual exclusion; and what are their initial values. 7.2. Insert the appropriate instructions and the P() and V() operations in the appropriate places in the pseudo-code below to fulfil this ordered execution. While(TRUE) } TI CS; While(TRUE){ 7 12 cs; T3 While(TRUE){ 7
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