// monitor takes a function pointer (function w/ int as parameter)
// and an int to run with the function pointer
void enter_monitor(int proc_num, int shm_id, void (*enter_cs)(int)) {
time_t tcurrent;
struct tm *timeinfo;
cond_t *cond;
cond = shmat(shm_id,0,0);
wait_sem(cond->sem_id,0); // mutex.wait() - wait for free critical section
wait_cond(cond);
time(&tcurrent);
timeinfo = localtime(&tcurrent);
fprintf(stderr, "Process %d entering critical section at %d:%02d:%02d\n",
proc_num,timeinfo->tm_hour, timeinfo->tm_min, timeinfo->tm_sec);
// execute the function sent to the monitor
(*enter_cs)(proc_num);
time(&tcurrent);
timeinfo = localtime(&tcurrent);
fprintf(stderr, "Process %d exiting critical section at %d:%02d:%02d\n",
proc_num,timeinfo->tm_hour, timeinfo->tm_min, timeinfo->tm_sec);
if (cond->next_count > 0) {
signal_sem(cond->sem_id,1); // next.signal();
signal_cond(cond);
} else {
signal_cond(cond);
}
signal_sem(cond->sem_id,0); // done with critical section
shmdt(cond);
}
PUBLIC void
V(semaphore_t *s)
{
s->count++;
signal_cond(s->non_empty);
}
