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2. Consider the following program, which attempts to use semaphores for mutual exclusion. (P = sem_wait, V = sem_signal) Initially: a = 1, b = 1, c = 1. Thread 1: a. b. C. Thread 3: P(c); P(c); P(b); V(c); V(b); . P(b); V(c); P(a); P(a); V (a); V(a); V(b); For each thread, list the pairs of mutexes that it holds simultaneously. Can this program deadlock? If a < b

2. Consider the following program, which attempts to use semaphores for mutual exclusion. (P = sem_wait, V = sem_signal) Initially: a = 1, b = 1, c = 1. Thread 1: a. b. C. Thread 3: P(c); P(c); P(b); V(c); V(b); . P(b); V(c); P(a); P(a); V (a); V(a); V(b); For each thread, list the pairs of mutexes that it holds simultaneously. Can this program deadlock? If a < b

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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2. Consider the following program, which attempts to use semaphores for mutual exclusion. (P = sem_wait, V = sem_signal) Initially: a = 1, b = 1, c = 1. Thread 1: Thread 3: P(c); P(c); P(b); V(c); V(b); P(b); V(c); P(a); P(a); V (a); V(a); V(b); a. For each thread, list the pairs of mutexes that it holds simultaneously. b. Can this program deadlock? C. If a <b<c, which threads violate the mutex lock ordering rule? P(a); P (b); V (b); P(c); V(c); V (a); Thread 2:
Transcribed Image Text:2. Consider the following program, which attempts to use semaphores for mutual exclusion. (P = sem_wait, V = sem_signal) Initially: a = 1, b = 1, c = 1. Thread 1: Thread 3: P(c); P(c); P(b); V(c); V(b); P(b); V(c); P(a); P(a); V (a); V(a); V(b); a. For each thread, list the pairs of mutexes that it holds simultaneously. b. Can this program deadlock? C. If a <b<c, which threads violate the mutex lock ordering rule? P(a); P (b); V (b); P(c); V(c); V (a); Thread 2:
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