static void check_deadlocks() {
int key1, key2;
char *sk1, *sk2;
if (lock_waiting_list == NULL)
return;
GList *trans_waiting = g_hash_table_get_keys(wait_table);
for (int i = 0; i < g_list_length(trans_waiting); i++) {
sk1 = g_list_nth_data(trans_waiting, i);
if (sk1 == NULL)
continue;
for (int j = 0; j < g_list_length(trans_waiting); j++) {
sk2 = g_list_nth_data(trans_waiting, j);
if (sk2 == NULL)
continue;
key1 = atoi(sk1);
key2 = atoi(sk2);
if (key1 == key2)
continue;
if (is_locking(key1, key2) && is_locking(key2, key1)) {
printf("* DEADLOCK DETECTED *\n");
// Selecionando pela operação mais velha
sk1 = g_strdup_printf("%d", key1);
GSList *op_list = g_hash_table_lookup(wait_table, sk1);
g_free(sk1);
if (g_slist_length(op_list) == 0)
continue;
struct operation *op = g_slist_nth_data(op_list, 0);
if (op == NULL)
continue;
abort_transaction(op);
return;
}
}
}
}
/* Add clients file descriptors to fds. */
static void add_clients_fds (fd_set *read, fd_set *write)
{
int i;
for (i = 0; i < CLIENTS_MAX; i++)
if (clients[i].socket != -1) {
if (locking_client() == -1 || is_locking(&clients[i]))
FD_SET (clients[i].socket, read);
LOCK (clients[i].events_mtx);
if (!event_queue_empty(&clients[i].events))
FD_SET (clients[i].socket, write);
UNLOCK (clients[i].events_mtx);
}
}
/* Handle clients whose fds are ready to read. */
static void handle_clients (fd_set *fds)
{
int i;
for (i = 0; i < CLIENTS_MAX; i++)
if (clients[i].socket != -1
&& FD_ISSET(clients[i].socket, fds)) {
if (locking_client() == -1
|| is_locking(&clients[i]))
handle_command (i);
else
debug ("Not getting a command from client with"
" fd %d because of lock",
clients[i].socket);
}
}
