int main(int argc, char *argv[]) {
int num_threads = 1;
int num_libs = 1;
if (argc >= 2)
num_threads = atoi(argv[1]);
if (argc >= 3)
num_libs = atoi(argv[2]);
assert(num_libs <= MAX_N_FUNCTIONS);
int lib;
for (lib = 0; lib < num_libs; lib++) {
char buf[4096];
snprintf(buf, sizeof(buf), "%s-f%d.so", argv[0], lib);
void *handle = dlopen(buf, RTLD_LAZY);
if (!handle) {
fprintf(stderr, "%s\n", dlerror());
exit(1);
}
snprintf(buf, sizeof(buf), "f%d", lib);
Functions[lib] = (f_t)dlsym(handle, buf);
if (!Functions[lib]) {
fprintf(stderr, "%s\n", dlerror());
exit(1);
}
fprintf(stderr, "LIB[%03d] %s: %p\n", lib, buf, Functions[lib]);
PrintStuff(0);
int i;
for (i = 0; i < num_threads; i++) {
pthread_t t;
fprintf(stderr, "Creating thread %d\n", i);
pthread_create(&t, 0, PrintStuff, 0);
pthread_join(t, 0);
}
}
return 0;
}
/* ---------------------------- USERINTERACTION --------------------------- */
void UserInteraction (Student *hash_table, int *access_table, int *elements) {
int selection;
char user_input[KILOBYTE];
do {
PrintStuff (hash_table, access_table);
/* print the two tables every single time */
printf ("\n------- MENU -------\n");
printf ("1. Insert a new entry.\n");
printf ("2. Search with an ID number.\n");
printf ("3. Search with a name\n");
printf ("4. Exit\n");
printf ("Enter you selection: ");
fgets (user_input, KILOBYTE, stdin);
selection = atoi (user_input);
/* get the user input from the keyboard and convert it integer */
if (selection == INSERT) {
char one_line[KILOBYTE];
int student_ID = 0;
char *token;
int hash_index;
printf ("Please enter data (student_ID, first_name last_name): ");
fgets (one_line, KILOBYTE, stdin);
/* prompt user for data and read from keyboard */
/* ### START of cut and paste from ReadFile() */
strtok (one_line, " ");
student_ID = atoi (one_line);
hash_index = Hash (hash_table, student_ID);
hash_table[hash_index].student_ID = student_ID;
token = (char *) strtok (NULL, " ");
hash_table[hash_index].first_name =
(char *) malloc (strlen (token) + 1);
strcpy (hash_table[hash_index].first_name, token);
token = (char *) strtok (NULL, " \n");
hash_table[hash_index].last_name =
(char *) malloc (strlen (token) + 1);
strcpy (hash_table[hash_index].last_name, token);
hash_table[hash_index].name = (char *) malloc
(strlen (hash_table[hash_index].last_name)
+ strlen (hash_table[hash_index].first_name) + 1);
strcpy (hash_table[hash_index].name,
hash_table[hash_index].last_name);
strcat (hash_table[hash_index].name,
hash_table[hash_index].first_name);
/* ### END of cut and paste from ReadFile() */
/* MAKE SURE elements and the access table get updated */
*elements = QuickSort (hash_table, access_table);
}
else if (selection == SEARCH_ID) {
int hash_index;
int probe_number = 0;
char user_search[KILOBYTE];
int student_ID = 0;
printf ("Please enter the student ID: ");
fgets (user_search, KILOBYTE, stdin);
student_ID = atoi (user_search);
/* prompt user for student ID, get it, and conver to integer */
hash_index = student_ID % HASH_SIZE;
/* do the hash function !!! */
/* if studentID does not match, then keep probing */
while (hash_table[hash_index].student_ID != student_ID
&& probe_number < ( (HASH_SIZE + 1) / 2) ) {
probe_number++;
hash_index = hash_index + (2 * probe_number - 1);
hash_index = hash_index % HASH_SIZE;
}
/* if probe_number == HASH_SIZE / 2 then NOT FOUND */
if (probe_number == (HASH_SIZE + 1) / 2) {
hash_index = -1;
/* -- printf ("--> Unable to find \"%d\".\n", student_ID); -- */
}
/* ... otherwise print out what has been found */
/* else { */
printf ("--> \"%d\" found at location %d.\n", student_ID,
hash_index);
/* } */
}
else if (selection == SEARCH_NAME) {
char user_search[KILOBYTE];
char *search_for;
char first[KILOBYTE];
int i = 0;
printf ("Please enter the name (first_name last_name): ");
fgets (user_search, KILOBYTE, stdin);
/* prompt for names, get them, and REVERSE..... */
/* ### REVERSE PROCESS */
search_for = (char *) malloc (strlen (user_search) + 1);
user_search[strlen (user_search) - 1] = '\0';
while (user_search[i] != ' ') {
first[i] = user_search[i];
i++;
}
first[i] = '\0';
i++;
strcpy (search_for, &user_search[i]);
strcat (search_for, first);
/* ### END OF REVERSE PROCESS */
printf ("(Comparing: "); /* ?Gay */
i = BinarySearch (hash_table, access_table, search_for, *elements);
/* perform the binary search here */
printf (")"); /* ?Gay */
printf ("--> \"%s\" found at location %d.\n", user_search, i);
/* print out what was found */
}
} while (selection != SELECT_EXIT);
/* keep loopint until the user enters '4' */
}
