*/
typedef struct finger {
int id;
- const char* mailbox;
+ char* mailbox;
} s_finger_t, *finger_t;
/**
*/
typedef struct node {
int id; // my id
- const char* mailbox;
+ char* mailbox;
s_finger_t fingers[NB_BITS]; // finger table (fingers[0] is my successor)
int pred_id; // predecessor id
- const char* pred_mailbox;
+ char* pred_mailbox;
xbt_dynar_t comms; // current communications to finish
} s_node_t, *node_t;
int answer_id;
const char* answer_to;
const char* issuer_host_name; // used for logging
+ int successor_id; // used when quitting
+ int pred_id; // used when quitting
} s_task_data_t, *task_data_t;
// utility functions
static void initialize_first_node(node_t node);
static void initialize_finger_table(node_t data, int known_id);
static void join(node_t node, int known_id);
+static void leave(node_t node);
// Chord core
static int find_successor(node_t node, int id);
static void notify(node_t node, int predecessor_candidate_id);
static void remote_notify(node_t node, int notify_to, int predecessor_candidate_id);
static void stabilize(node_t node);
+static void quit_notify(node_t node, int to);
/**
* \brief Turns an id into an equivalent id in [0, NB_KEYS[
while (id < 0) {
id += NB_KEYS;
}
-
// make sure id < NB_KEYS
id = id % NB_KEYS;
INFO0("My finger table:");
INFO0("Start | Succ ");
for (i = 0; i < NB_BITS; i++) {
- INFO2(" %4d | %4d ", (node->id + pow) % NB_KEYS, node->fingers[i].id);
+ INFO2(" %3d | %3d ", (node->id + pow) % NB_KEYS, node->fingers[i].id);
pow = pow << 1;
}
INFO1("Predecessor: %d", node->pred_id);
*/
int node(int argc, char *argv[])
{
+ double init_time = MSG_get_clock();
msg_comm_t comm = NULL;
+ int i;
+ char* mailbox;
+ double deadline;
- xbt_assert0(argc == 2 || argc == 4, "Wrong number of arguments for this node");
+ xbt_assert0(argc == 3 || argc == 5, "Wrong number of arguments for this node");
// initialize my node
s_node_t node = {0};
node.mailbox = get_mailbox(node.id);
node.comms = xbt_dynar_new(sizeof(msg_comm_t), NULL);
- if (argc == 2) { // first ring
+
+ if (argc == 3) { // first ring
initialize_first_node(&node);
+ deadline = atof(argv[2]);
}
else {
int known_id = atoi(argv[2]);
double sleep_time = atof(argv[3]);
+ deadline = atof(argv[4]);
// sleep before starting
INFO1("Let's sleep >>%f", sleep_time);
join(&node, known_id);
}
- while (1) {
+ while ((MSG_get_clock( )- init_time) < deadline) {
unsigned int cursor;
comm = NULL;
xbt_dynar_foreach(node.comms, cursor, comm) {
if (MSG_comm_test(comm)) { // FIXME: try with MSG_comm_testany instead
xbt_dynar_cursor_rm(node.comms, &cursor);
+ MSG_comm_destroy(comm);
}
}
m_task_t task = NULL;
- MSG_error_t res = MSG_task_receive(&task, node.mailbox);
+ MSG_error_t res = MSG_task_receive_with_timeout(&task, node.mailbox,45); // FIXME >> find the right timeout !!
- xbt_assert0(res == MSG_OK, "MSG_task_receive failed");
+ if(res == MSG_OK) // else check deadline condition and keep waiting for a task
+ {
// get data
const char* task_name = MSG_task_get_name(task);
// otherwise, forward the request to the closest preceding finger in my table
int closest = closest_preceding_finger(&node, task_data->request_id);
INFO2("Forwarding 'Find Successor' request for id %d to my closest preceding finger %d", task_data->request_id, closest);
- comm = MSG_task_isend(task, get_mailbox(closest));
+ mailbox = get_mailbox(closest);
+ comm = MSG_task_isend(task, mailbox);
xbt_dynar_push(node.comms, &comm);
+ xbt_free(mailbox);
}
}
- /*
- else if (!strcmp(task_name, "Find Successor Answer")) {
- }
- */
else if (!strcmp(task_name, "Find Predecessor")) {
INFO2("Receiving a 'Find Predecessor' Request from %s for id %d", task_data->issuer_host_name, task_data->request_id);
// am I the predecessor?
// otherwise, forward the request to the closest preceding finger in my table
int closest = closest_preceding_finger(&node, task_data->request_id);
INFO2("Forwarding 'Find Predecessor' request for id %d to my closest preceding finger %d", task_data->request_id, closest);
- comm = MSG_task_isend(task, get_mailbox(closest));
+ mailbox = get_mailbox(closest);
+ comm = MSG_task_isend(task, mailbox);
xbt_dynar_push(node.comms, &comm);
+ xbt_free(mailbox);
}
}
- /*
- else if (!strcmp(task_name, "Find Predecessor Answer")) {
- }
- */
else if (!strcmp(task_name, "Update Finger")) {
// someone is telling me that he may be my new finger
- INFO1("Receving an 'Update Finger' from %s", task_data->issuer_host_name);
+ INFO1("Receiving an 'Update Finger' request from %s", task_data->issuer_host_name);
update_finger_table(&node, task_data->request_id, task_data->request_finger);
}
else if (!strcmp(task_name, "Notify")) {
// someone is telling me that he may be my new predecessor
- INFO1("Receving an 'Notify' from %s", task_data->issuer_host_name);
+ INFO1("Receiving a 'Notify' request from %s", task_data->issuer_host_name);
notify(&node, task_data->request_id);
}
- /*
- else if (!strcmp(task_name, "Fix Fingers"))
- {
- int i;
- for (i = KEY_BITS - 1 ; i >= 0; i--)
- {
- data->fingers[i] = find_finger_elem(data,(data->id)+pow(2,i-1));
- }
+ else if (!strcmp(task_name, "Predecessor Leaving")) {
+ // my predecessor is about quitting
+ INFO1("Receiving a 'quite notify' from %s", task_data->issuer_host_name);
+ // modify my predecessor
+ node.pred_id = task_data->pred_id;
+ node.pred_mailbox = get_mailbox(node.id);
+ /*TODO :
+ >> notify my new predecessor
+ >> send a notify_predecessors !!
+ */
+
+ }
+ else if (!strcmp(task_name, "Successor Leaving")) {
+ // my successor is about quitting
+ INFO1("Receiving a 'quite notify' from %s", task_data->issuer_host_name);
+ // modify my successor FIXME : this should be implicit ?
+ node.fingers[0].id = task_data->successor_id;
+ node.fingers[0].mailbox = get_mailbox(node.fingers[0].id);
+ /* TODO
+ >> notify my new successor
+ >> update my table & predecessors table */
+ }
}
- */
}
-
+ // leave the ring and quit simulation
+ leave(&node);
xbt_dynar_free(&node.comms);
+ xbt_free(node.mailbox);
+ xbt_free(node.pred_mailbox);
+ for (i = 0; i < NB_BITS - 1; i++) {
+ xbt_free(node.fingers[i].mailbox);
+ }
}
/**
int i;
for (i = 0; i < NB_BITS; i++) {
node->fingers[i].id = node->id;
- node->fingers[i].mailbox = node->mailbox;
+ node->fingers[i].mailbox = xbt_strdup(node->mailbox);
}
node->pred_id = node->id;
node->pred_mailbox = node->mailbox;
initialize_finger_table(node, known_id); // determine my fingers, asking to known_id
remote_notify(node, node->fingers[0].id, node->id); // tell my successor that I'm his new predecessor
notify_predecessors(node); // tell others that I may have became their finger
- remote_move_keys(node, node->fingers[0].id); // take some key-value pairs from my sucessor
+ remote_move_keys(node, node->fingers[0].id); // take some key-value pairs from my successor
+}
+
+/**
+ * \brief Makes the current node quit the system
+ * \param node the current node
+ */
+static void leave(node_t node)
+{
+ INFO0("Well Guys! I Think it's time for me to quit ;)");
+ quit_notify(node,1); // notify to my successor ( >>> 1 );
+ quit_notify(node,-1); // notify my predecessor ( >>> -1);
+ // TODO ...
+}
+/*
+ * \brief Notify msg to tell my successor||predecessor about my departure
+ * \param node the current node
+ */
+static void quit_notify(node_t node, int to)
+{
+ task_data_t req_data = xbt_new0(s_task_data_t, 1);
+ req_data->request_id = node->id;
+ req_data->successor_id = node->fingers[0].id;
+ req_data->pred_id = node->pred_id;
+ req_data->issuer_host_name = MSG_host_get_name(MSG_host_self());
+ const char *task_name = NULL;
+ const char* to_mailbox;
+ if( to == 1) // notify my successor
+ {
+ to_mailbox = node->fingers[0].mailbox;
+ INFO1("Telling my Successor about my departure via mailbox %s", to_mailbox);
+ task_name = "Predecessor Leaving";
+
+ }
+ else if(to == -1) // notify my predecessor
+ {
+ to_mailbox = node->pred_mailbox;
+ INFO1("Telling my Predecessor about my departure via mailbox %s",to_mailbox);
+ task_name = "Predecessor Leaving";
+ }
+ m_task_t task = MSG_task_create(task_name, 1000, 5000, req_data);
+ //char* mailbox = get_mailbox(to_mailbox);
+ msg_comm_t comm = MSG_task_isend(task, to_mailbox);
+ xbt_dynar_push(node->comms, &comm);
}
/*
if (is_in_interval(candidate_id, node->id, node->fingers[finger_index].id - 1)) {
// INFO3("Candidate %d is between %d and %d!", candidate_id, node->id + pow, node->fingers[finger_index].id - 1);
// candidate_id is my new finger
+ xbt_free(node->fingers[finger_index].mailbox);
node->fingers[finger_index].id = candidate_id;
node->fingers[finger_index].mailbox = get_mailbox(candidate_id);
INFO2("My new finger #%d is %d", finger_index, candidate_id);
// send a "Update Finger" request to ask_to_id
INFO3("Sending an 'Update Finger' request to %d: his finger #%d may be %d now", ask_to_id, finger_index, candidate_id);
m_task_t task = MSG_task_create("Update Finger", 1000, 5000, req_data);
- msg_comm_t comm = MSG_task_isend(task, get_mailbox(ask_to_id));
+ char* mailbox = get_mailbox(ask_to_id);
+ msg_comm_t comm = MSG_task_isend(task, mailbox);
xbt_dynar_push(node->comms, &comm);
+ xbt_free(mailbox);
}
/**
static int remote_find_successor(node_t node, int ask_to, int id)
{
s_task_data_t req_data;
- char *mailbox = bprintf("%s Find Successor", node->mailbox);
+ char* mailbox = bprintf("%s Find Successor", node->mailbox);
req_data.request_id = id;
req_data.answer_to = mailbox;
req_data.issuer_host_name = MSG_host_get_name(MSG_host_self());
return successor;
}
+
/**
* \brief Makes the current node find the predecessor node of an id.
* \param node the current node
static int remote_find_predecessor(node_t node, int ask_to, int id)
{
s_task_data_t req_data;
- char *mailbox = bprintf("%s Find Predecessor", node->mailbox);
+ char* mailbox = bprintf("%s Find Predecessor", node->mailbox);
req_data.request_id = id;
req_data.answer_to = mailbox;
req_data.issuer_host_name = MSG_host_get_name(MSG_host_self());
int x = find_predecessor(node, node->fingers[0].id);
if (is_in_interval(x, node->id + 1, node->fingers[0].id)) {
+ xbt_free(node->fingers[0].mailbox);
node->fingers[0].id = x;
node->fingers[0].mailbox = get_mailbox(x);
}
// send a "Notify" request to notify_id
INFO1("Sending a 'Notify' request to %d", notify_id);
m_task_t task = MSG_task_create("Notify", 1000, 5000, req_data);
- msg_comm_t comm = MSG_task_isend(task, get_mailbox(notify_id));
+ char* mailbox = get_mailbox(notify_id);
+ msg_comm_t comm = MSG_task_isend(task, mailbox);
xbt_dynar_push(node->comms, &comm);
+ xbt_free(mailbox);
}
/**
