Answer should be true or false

The following solution proposal (programmer's approach) is guaranteed to coordinate exclusive access to the critical solution between two threads.

#include  #include  #include  #include  #include  #define NTHREADS 2 void *go(void *arg); pthread_t threads[NTHREADS]; struct d { int j; int turn; bool flag[2]; }; int main() { struct d *data = (struct d *) malloc (sizeof(struct d)); data -> flag[0] = false; data -> flag[1] = false; int i; for (i = 0; i < NTHREADS; i++){ data -> j = i; pthread_create(&threads[i], NULL, go, data); sleep(1); } for (i = 0; i < NTHREADS; i++) pthread_join(threads[i],NULL); return 0; } void *go(void *arg) { struct d *data = arg; int k = data -> j; data -> flag[k] = true; data -> turn = !k; sleep(10); printf("Thread %d is now attempting .... ", k); while (data -> flag[!k] && data -> turn == !k); printf("Thread %d is running in its Critical Section........ ", k); data -> flag[k] = false; pthread_exit(0); }