, where only 3 forks are available and each philosopher needs two forks. The outputs after running the program
, where only 3 forks are available and each philosopher needs two forks. The outputs after running the program
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Figure 4 shows a
only includes 3 philosophers who want to eat, where only 3 forks are available and each
philosopher needs two forks. The outputs after running the program are given .
In the outputs, it seems that the program never finishes executing;
thus, (a) which lines of the code are considered critical section?
(b) which lines of the code is (or should be) implemented as atomic operations
![1 #include<stdio.h>
2 #include<pthread.h>
3 #include<semaphore.h>
4 #include<unistd.h>
5 sem_t fork [3];
6
7 void eat (int phil) {
8
9
10}
11 void
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18
19
20}
21 int main() {
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223 M M
Nt06
32}
printf("Philosopher %d is eating\n", phil);
sleep (2); //time eating
philosopher (void * num) {
int phil=*(int *)num;
printf("Philosopher %d wants to eat\n",phil);
sem_wait (&fork[phil]);
sem_wait (&fork [(phil+1)]);
eat (phil);
printf("Philosopher %d has finished eating\n", phil);
sem_post(&fork[(phil+1)]);
sem_post(&fork[phil]);
int i, a[3];
pthread_t tid [3];
for(i=0; i<3; i++)
sem_init(&fork[i],0,1);
for(i=0; i<3; i++) {
a[i]=i;
pthread_create(&tid[i], NULL, philosopher, (void *)&a[i]);
}
for(i=0; i<3; i++)
pthread_join(tid[i],NULL);](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fed42fcd9-b096-4a17-a382-621e716f219f%2F834b356a-3b4b-413e-9784-89ed6e96727b%2Fq3f84pk_processed.png&w=3840&q=75)
Transcribed Image Text:1 #include<stdio.h>
2 #include<pthread.h>
3 #include<semaphore.h>
4 #include<unistd.h>
5 sem_t fork [3];
6
7 void eat (int phil) {
8
9
10}
11 void
12
13
14
15
16
17
18
19
20}
21 int main() {
22
23
24
25
26
27
28
29
30
31
223 M M
Nt06
32}
printf("Philosopher %d is eating\n", phil);
sleep (2); //time eating
philosopher (void * num) {
int phil=*(int *)num;
printf("Philosopher %d wants to eat\n",phil);
sem_wait (&fork[phil]);
sem_wait (&fork [(phil+1)]);
eat (phil);
printf("Philosopher %d has finished eating\n", phil);
sem_post(&fork[(phil+1)]);
sem_post(&fork[phil]);
int i, a[3];
pthread_t tid [3];
for(i=0; i<3; i++)
sem_init(&fork[i],0,1);
for(i=0; i<3; i++) {
a[i]=i;
pthread_create(&tid[i], NULL, philosopher, (void *)&a[i]);
}
for(i=0; i<3; i++)
pthread_join(tid[i],NULL);
Transcribed Image Text:Philosopher
Philosopher
Philosopher
2 wants to eat
1 wants to eat
wants to eat
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