Just need help on the first question and "write the list of operations across time units"

1 #include 2 #include 3 #include 4 #include 5 #include 6 #include 7 8 #define NUM_THREADS 4 9 10 sem_t semaphorel; 11 12 void *function1(void * arg) { 13 sem_wait(&semaphorel); 14 sleep(1); 15 printf("in function1 tid %lu ", pthread_self()); 16 sem_post(&semaphorel); 17 return NULL; 18 } 19 20 int main() { 21 pthread_t *thread_group = malloc(sizeof (pthread_t) *NUM_THREADS); 22 sem_init(&semaphore1, 0, 1); 23 for(int i = 0; i