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Computer Science Engineering Software Engineering Difficulty: Medium

What are the main components of the expert systems? Which of the following is essential for success, when formal methods are used for the first time? What is the output of this program? #include<stdio.h> #include<pthread.h> #include<semaphore.h> void *fun_t(void *arg); void *fun_t(void *arg) { sem_post(&st); pthread_exit("Bye"); } int main() { pthread_t pt; sem_t st; void *res_t; if(pthread_create(&pt,NULL,fun_t,NULL) == -1) perror("pthread_create"); if(sem_init(&st,0,0) != 0) perror("sem_init"); if(sem_wait(&st) != 0) perror("sem_wait"); printf("Example\n"); if(pthread_join(pt,&res_t) == -1) perror("pthread_join"); if(sem_destroy(&st) != 0) perror("sem_destroy"); return 0; } What is the purpose of a DMA (Direct Memory Access) controller in a computer system? Which cache mapping technique uses a direct mapping of main memory blocks to specific cache locations?