Question

p1.c outputs _________ and p2.c outputs__________

p1.c:

int total = 0;

int main( ) {

if (fork( ) == 0) {

total +=4;

exit (0);

}

wait( NULL);

total += 3;

printf( “%d\n”, total);

}

p2.c:

int total = 0;

void *thread_start(void *v) {

total += 4;

}

int main ( ) {

pthread_t tid;

pthread_create(&tis, NULL, thread_start, NULL);

pthread_join(tid, NULL);

total += 3;

printf(“%d\n”, total);

}

Answer 1

If you have any doubts, please give me comment...

p1.c outputs 3

in fork()==0 executes child processes, it will execute separately, so the adding value of 4 to the total will not added. after terminating child process it wil add 3 to total, then prints

p2.c outputs 7

while pthread executes it will add 4, then again it will add 3. so output gives 7