#include "msg/msg.h"
#include "xbt/log.h"
#include "xbt/asserts.h"
+#include "mc/modelchecker.h"
+#include "mc/mc.h"
+#include "xbt/xbt_os_time.h"
+
XBT_LOG_NEW_DEFAULT_CATEGORY(msg_chord,
"Messages specific for this msg example");
-#define NB_BITS 6
-#define NB_KEYS 64
#define COMM_SIZE 10
#define COMP_SIZE 0
+#define MAILBOX_NAME_SIZE 10
+
+static int nb_bits = 24;
+static int nb_keys = 0;
+static int timeout = 50;
+static int max_simulation_time = 1000;
+static int periodic_stabilize_delay = 20;
+static int periodic_fix_fingers_delay = 120;
+static int periodic_check_predecessor_delay = 120;
+static int periodic_lookup_delay = 10;
+
+extern long int smx_total_comms;
/**
* Finger element.
*/
typedef struct finger {
int id;
- char* mailbox;
+ char mailbox[MAILBOX_NAME_SIZE]; // string representation of the id
} s_finger_t, *finger_t;
/**
*/
typedef struct node {
int id; // my id
- char* mailbox; // my usual mailbox name
- s_finger_t fingers[NB_BITS]; // finger table (fingers[0] is my successor)
+ char mailbox[MAILBOX_NAME_SIZE]; // my mailbox name (string representation of the id)
+ s_finger_t *fingers; // finger table, of size nb_bits (fingers[0] is my successor)
int pred_id; // predecessor id
- char* pred_mailbox; // predecessor's mailbox name
+ char pred_mailbox[MAILBOX_NAME_SIZE]; // predecessor's mailbox name
int next_finger_to_fix; // index of the next finger to fix in fix_fingers()
msg_comm_t comm_receive; // current communication to receive
- xbt_dynar_t comms; // current communications being sent
+ double last_change_date; // last time I changed a finger or my predecessor
} s_node_t, *node_t;
/**
int request_id; // id paramater (used by some types of tasks)
int request_finger; // finger parameter (used by some types of tasks)
int answer_id; // answer (used by some types of tasks)
- const char* answer_to; // mailbox to send an answer to
+ char answer_to[MAILBOX_NAME_SIZE]; // mailbox to send an answer to (if any)
const char* issuer_host_name; // used for logging
} s_task_data_t, *task_data_t;
-static int powers2[NB_BITS];
+static int *powers2;
// utility functions
static void chord_initialize(void);
static int normalize(int id);
static int is_in_interval(int id, int start, int end);
-static char* get_mailbox(int host_id);
+static void get_mailbox(int host_id, char* mailbox);
+static void task_free(void* task);
static void print_finger_table(node_t node);
static void set_finger(node_t node, int finger_index, int id);
static void set_predecessor(node_t node, int predecessor_id);
static void remote_notify(node_t node, int notify_to, int predecessor_candidate_id);
static void fix_fingers(node_t node);
static void check_predecessor(node_t node);
+static void random_lookup(node_t);
static void quit_notify(node_t node, int to);
/**
static void chord_initialize(void)
{
// compute the powers of 2 once for all
+ powers2 = xbt_new(int, nb_bits);
int pow = 1;
int i;
- for (i = 0; i < NB_BITS; i++) {
+ for (i = 0; i < nb_bits; i++) {
powers2[i] = pow;
pow = pow << 1;
}
+ nb_keys = pow;
+ XBT_DEBUG("Sets nb_keys to %d", nb_keys);
}
/**
- * \brief Turns an id into an equivalent id in [0, NB_KEYS).
+ * \brief Turns an id into an equivalent id in [0, nb_keys).
* \param id an id
* \return the corresponding normalized id
*/
static int normalize(int id)
{
- // make sure id >= 0
- while (id < 0) {
- id += NB_KEYS;
- }
- // make sure id < NB_KEYS
- id = id % NB_KEYS;
-
- return id;
+ // like id % nb_keys, but works with negatives numbers (and faster)
+ return id & (nb_keys - 1);
}
/**
* \brief Returns whether a id belongs to the interval [start, end].
*
- * The parameters are noramlized to make sure they are between 0 and CHORD_NB_KEYS - 1).
+ * The parameters are noramlized to make sure they are between 0 and nb_keys - 1).
* 1 belongs to [62, 3]
* 1 does not belong to [3, 62]
* 63 belongs to [62, 3]
// make sure end >= start and id >= start
if (end < start) {
- end += NB_KEYS;
+ end += nb_keys;
}
if (id < start) {
- id += NB_KEYS;
+ id += nb_keys;
}
return id <= end;
/**
* \brief Gets the mailbox name of a host given its chord id.
* \param node_id id of a node
- * \return the name of its mailbox
+ * \param mailbox pointer to where the mailbox name should be written
+ * (there must be enough space)
+ */
+static void get_mailbox(int node_id, char* mailbox)
+{
+ snprintf(mailbox, MAILBOX_NAME_SIZE - 1, "%d", node_id);
+}
+
+/**
+ * \brief Frees the memory used by a task.
+ * \param task the MSG task to destroy
*/
-static char* get_mailbox(int node_id)
+static void task_free(void* task)
{
- return bprintf("mailbox%d", node_id);
+ // TODO add a parameter data_free_function to MSG_task_create?
+ xbt_free(MSG_task_get_data(task));
+ MSG_task_destroy(task);
}
/**
*/
static void print_finger_table(node_t node)
{
- int i;
- int pow = 1;
- INFO0("My finger table:");
- INFO0("Start | Succ ");
- for (i = 0; i < NB_BITS; i++) {
- INFO2(" %3d | %3d ", (node->id + pow) % NB_KEYS, node->fingers[i].id);
- pow = pow << 1;
+ if (XBT_LOG_ISENABLED(msg_chord, xbt_log_priority_verbose)) {
+ int i;
+ XBT_VERB("My finger table:");
+ XBT_VERB("Start | Succ ");
+ for (i = 0; i < nb_bits; i++) {
+ XBT_VERB(" %3d | %3d ", (node->id + powers2[i]) % nb_keys, node->fingers[i].id);
+ }
+ XBT_VERB("Predecessor: %d", node->pred_id);
}
- INFO1("Predecessor: %d", node->pred_id);
}
/**
* \brief Sets a finger of the current node.
* \param node the current node
- * \param finger_index index of the finger to set (0 to NB_BITS - 1)
+ * \param finger_index index of the finger to set (0 to nb_bits - 1)
* \param id the id to set for this finger
*/
static void set_finger(node_t node, int finger_index, int id)
{
- node->fingers[finger_index].id = id;
- xbt_free(node->fingers[finger_index].mailbox);
- node->fingers[finger_index].mailbox = get_mailbox(id);
- DEBUG2("My new finger #%d is %d", finger_index, id);
+ if (id != node->fingers[finger_index].id) {
+ node->fingers[finger_index].id = id;
+ get_mailbox(id, node->fingers[finger_index].mailbox);
+ node->last_change_date = MSG_get_clock();
+ XBT_DEBUG("My new finger #%d is %d", finger_index, id);
+ }
}
/**
*/
static void set_predecessor(node_t node, int predecessor_id)
{
- node->pred_id = predecessor_id;
- xbt_free(node->pred_mailbox);
+ if (predecessor_id != node->pred_id) {
+ node->pred_id = predecessor_id;
- if (predecessor_id != -1) {
- node->pred_mailbox = get_mailbox(predecessor_id);
- }
+ if (predecessor_id != -1) {
+ get_mailbox(predecessor_id, node->pred_mailbox);
+ }
+ node->last_change_date = MSG_get_clock();
- DEBUG1("My new predecessor is %d", predecessor_id);
+ XBT_DEBUG("My new predecessor is %d", predecessor_id);
+ }
}
/**
*/
int node(int argc, char *argv[])
{
+ /* Reduce the run size for the MC */
+ if(MC_IS_ENABLED){
+ periodic_stabilize_delay = 8;
+ periodic_fix_fingers_delay = 8;
+ periodic_check_predecessor_delay = 8;
+ }
+
double init_time = MSG_get_clock();
- m_task_t task = NULL;
m_task_t task_received = NULL;
- msg_comm_t comm_send = NULL;
int i;
- int index;
int join_success = 0;
double deadline;
- double next_stabilize_date = init_time + 10;
- double next_fix_fingers_date = init_time + 10;
- double next_check_predecessor_date = init_time + 10;
+ double next_stabilize_date = init_time + periodic_stabilize_delay;
+ double next_fix_fingers_date = init_time + periodic_fix_fingers_delay;
+ double next_check_predecessor_date = init_time + periodic_check_predecessor_delay;
+ double next_lookup_date = init_time + periodic_lookup_delay;
xbt_assert0(argc == 3 || argc == 5, "Wrong number of arguments for this node");
// initialize my node
s_node_t node = {0};
node.id = atoi(argv[1]);
- node.mailbox = get_mailbox(node.id);
+ get_mailbox(node.id, node.mailbox);
node.next_finger_to_fix = 0;
- node.comms = xbt_dynar_new(sizeof(msg_comm_t), NULL);
+ node.fingers = xbt_new0(s_finger_t, nb_bits);
+ node.last_change_date = init_time;
- for (i = 0; i < NB_BITS; i++) {
+ for (i = 0; i < nb_bits; i++) {
+ node.fingers[i].id = -1;
set_finger(&node, i, node.id);
}
}
else {
int known_id = atoi(argv[2]);
- double sleep_time = atof(argv[3]);
+ //double sleep_time = atof(argv[3]);
deadline = atof(argv[4]);
+ /*
// sleep before starting
- DEBUG1("Let's sleep during %f", sleep_time);
+ XBT_DEBUG("Let's sleep during %f", sleep_time);
MSG_process_sleep(sleep_time);
- DEBUG0("Hey! Let's join the system.");
+ */
+ XBT_DEBUG("Hey! Let's join the system.");
join_success = join(&node, known_id);
}
if (join_success) {
- while (MSG_get_clock() < init_time + deadline) {
+ while (MSG_get_clock() < init_time + deadline
+// && MSG_get_clock() < node.last_change_date + 1000
+ && MSG_get_clock() < max_simulation_time) {
if (node.comm_receive == NULL) {
task_received = NULL;
// no task was received: make some periodic calls
if (MSG_get_clock() >= next_stabilize_date) {
stabilize(&node);
- next_stabilize_date = MSG_get_clock() + 10;
+ next_stabilize_date = MSG_get_clock() + periodic_stabilize_delay;
}
else if (MSG_get_clock() >= next_fix_fingers_date) {
fix_fingers(&node);
- next_fix_fingers_date = MSG_get_clock() + 10;
+ next_fix_fingers_date = MSG_get_clock() + periodic_fix_fingers_delay;
}
else if (MSG_get_clock() >= next_check_predecessor_date) {
check_predecessor(&node);
- next_check_predecessor_date = MSG_get_clock() + 10;
+ next_check_predecessor_date = MSG_get_clock() + periodic_check_predecessor_delay;
}
+ else if (MSG_get_clock() >= next_lookup_date) {
+ random_lookup(&node);
+ next_lookup_date = MSG_get_clock() + periodic_lookup_delay;
+ }
else {
// nothing to do: sleep for a while
MSG_process_sleep(5);
// a transfer has occured
MSG_error_t status = MSG_comm_get_status(node.comm_receive);
- MSG_comm_destroy(node.comm_receive);
- node.comm_receive = NULL;
if (status != MSG_OK) {
- DEBUG0("Failed to receive a task. Nevermind.");
+ XBT_DEBUG("Failed to receive a task. Nevermind.");
+ node.comm_receive = NULL;
}
else {
// the task was successfully received
+ MSG_comm_destroy(node.comm_receive);
+ node.comm_receive = NULL;
handle_task(&node, task_received);
}
}
// see if some communications are finished
+ /*
while ((index = MSG_comm_testany(node.comms)) != -1) {
comm_send = xbt_dynar_get_as(node.comms, index, msg_comm_t);
MSG_error_t status = MSG_comm_get_status(comm_send);
xbt_dynar_remove_at(node.comms, index, &comm_send);
- DEBUG3("Communication %p is finished with status %d, dynar size is now %lu",
+ XBT_DEBUG("Communication %p is finished with status %d, dynar size is now %lu",
comm_send, status, xbt_dynar_length(node.comms));
+ m_task_t task = MSG_comm_get_task(comm_send);
MSG_comm_destroy(comm_send);
+ if (status != MSG_OK) {
+ task_data_destroy(MSG_task_get_data(task));
+ MSG_task_destroy(task);
+ }
}
+ */
}
// clean unfinished comms sent
- unsigned int cursor;
+ /* unsigned int cursor;
xbt_dynar_foreach(node.comms, cursor, comm_send) {
- task = MSG_comm_get_task(comm_send);
+ m_task_t task = MSG_comm_get_task(comm_send);
MSG_task_cancel(task);
- xbt_free(MSG_task_get_data(task));
+ task_data_destroy(MSG_task_get_data(task));
MSG_task_destroy(task);
MSG_comm_destroy(comm_send);
// FIXME: the task is actually not destroyed because MSG thinks that the other side (whose process is dead) is still using it
- }
+ }*/
// leave the ring
leave(&node);
}
// stop the simulation
- 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);
- }
+ xbt_free(node.fingers);
+ XBT_INFO("Messages created: %lu", smx_total_comms);
return 0;
}
*/
static void handle_task(node_t node, m_task_t task) {
- DEBUG1("Handling task %p", task);
- msg_comm_t comm = NULL;
- char* mailbox = NULL;
+ XBT_DEBUG("Handling task %p", task);
+ char mailbox[MAILBOX_NAME_SIZE];
task_data_t task_data = (task_data_t) MSG_task_get_data(task);
e_task_type_t type = task_data->type;
switch (type) {
case TASK_FIND_SUCCESSOR:
- DEBUG2("Receiving a 'Find Successor' request from %s for id %d",
+ XBT_DEBUG("Receiving a 'Find Successor' request from %s for id %d",
task_data->issuer_host_name, task_data->request_id);
// is my successor the successor?
if (is_in_interval(task_data->request_id, node->id + 1, node->fingers[0].id)) {
task_data->type = TASK_FIND_SUCCESSOR_ANSWER;
task_data->answer_id = node->fingers[0].id;
- comm = MSG_task_isend(task, task_data->answer_to);
- xbt_dynar_push(node->comms, &comm);
- DEBUG3("Sending back a 'Find Successor Answer' to %s: the successor of %d is %d",
+ XBT_DEBUG("Sending back a 'Find Successor Answer' to %s (mailbox %s): the successor of %d is %d",
task_data->issuer_host_name,
+ task_data->answer_to,
task_data->request_id, task_data->answer_id);
+ MSG_task_dsend(task, task_data->answer_to, task_free);
}
else {
// otherwise, forward the request to the closest preceding finger in my table
int closest = closest_preceding_node(node, task_data->request_id);
- DEBUG2("Forwarding the 'Find Successor' request for id %d to my closest preceding finger %d",
+ XBT_DEBUG("Forwarding the 'Find Successor' request for id %d to my closest preceding finger %d",
task_data->request_id, closest);
- mailbox = get_mailbox(closest);
- comm = MSG_task_isend(task, mailbox);
- xbt_dynar_push(node->comms, &comm);
- xbt_free(mailbox);
+ get_mailbox(closest, mailbox);
+ MSG_task_dsend(task, mailbox, task_free);
}
break;
case TASK_GET_PREDECESSOR:
- DEBUG1("Receiving a 'Get Predecessor' request from %s", task_data->issuer_host_name);
+ XBT_DEBUG("Receiving a 'Get Predecessor' request from %s", task_data->issuer_host_name);
task_data->type = TASK_GET_PREDECESSOR_ANSWER;
task_data->answer_id = node->pred_id;
- comm = MSG_task_isend(task, task_data->answer_to);
- xbt_dynar_push(node->comms, &comm);
- DEBUG3("Sending back a 'Get Predecessor Answer' to %s via mailbox '%s': my predecessor is %d",
+ XBT_DEBUG("Sending back a 'Get Predecessor Answer' to %s via mailbox '%s': my predecessor is %d",
task_data->issuer_host_name,
task_data->answer_to, task_data->answer_id);
+ MSG_task_dsend(task, task_data->answer_to, task_free);
break;
case TASK_NOTIFY:
// someone is telling me that he may be my new predecessor
- DEBUG1("Receiving a 'Notify' request from %s", task_data->issuer_host_name);
+ XBT_DEBUG("Receiving a 'Notify' request from %s", task_data->issuer_host_name);
notify(node, task_data->request_id);
- xbt_free(task_data);
- MSG_task_destroy(task);
+ task_free(task);
break;
case TASK_PREDECESSOR_LEAVING:
// my predecessor is about to quit
- DEBUG1("Receiving a 'Predecessor Leaving' message from %s", task_data->issuer_host_name);
+ XBT_DEBUG("Receiving a 'Predecessor Leaving' message from %s", task_data->issuer_host_name);
// modify my predecessor
set_predecessor(node, task_data->request_id);
- xbt_free(task_data);
- MSG_task_destroy(task);
+ task_free(task);
/*TODO :
>> notify my new predecessor
>> send a notify_predecessors !!
case TASK_SUCCESSOR_LEAVING:
// my successor is about to quit
- DEBUG1("Receiving a 'Successor Leaving' message from %s", task_data->issuer_host_name);
+ XBT_DEBUG("Receiving a 'Successor Leaving' message from %s", task_data->issuer_host_name);
// modify my successor FIXME : this should be implicit ?
set_finger(node, 0, task_data->request_id);
- xbt_free(task_data);
- MSG_task_destroy(task);
+ task_free(task);
/* TODO
>> notify my new successor
>> update my table & predecessors table */
break;
- default:
- CRITICAL1("Received an unexpected task: %d", type);
- //xbt_abort();
+ case TASK_FIND_SUCCESSOR_ANSWER:
+ case TASK_GET_PREDECESSOR_ANSWER:
+ XBT_DEBUG("Ignoring unexpected task of type %d (%p)", type, task);
+ task_free(task);
+ break;
}
}
*/
static void create(node_t node)
{
- DEBUG0("Create a new Chord ring...");
+ XBT_DEBUG("Create a new Chord ring...");
set_predecessor(node, -1); // -1 means that I have no predecessor
print_finger_table(node);
}
*/
static int join(node_t node, int known_id)
{
- INFO2("Joining the ring with id %d, knowing node %d", node->id, known_id);
+ XBT_INFO("Joining the ring with id %d, knowing node %d", node->id, known_id);
set_predecessor(node, -1); // no predecessor (yet)
+ /*
+ int i;
+ for (i = 0; i < nb_bits; i++) {
+ set_finger(node, i, known_id);
+ }
+ */
+
int successor_id = remote_find_successor(node, known_id, node->id);
if (successor_id == -1) {
- DEBUG0("Cannot join the ring.");
+ XBT_INFO("Cannot join the ring.");
}
else {
set_finger(node, 0, successor_id);
*/
static void leave(node_t node)
{
- DEBUG0("Well Guys! I Think it's time for me to quit ;)");
+ XBT_DEBUG("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 ...
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());
+ req_data->answer_to = NULL;
const char* task_name = NULL;
const char* to_mailbox = NULL;
if (to == 1) { // notify my successor
to_mailbox = node->fingers[0].mailbox;
- INFO2("Telling my Successor %d about my departure via mailbox %s",
+ XBT_INFO("Telling my Successor %d about my departure via mailbox %s",
node->fingers[0].id, to_mailbox);
req_data->type = TASK_PREDECESSOR_LEAVING;
}
}
to_mailbox = node->pred_mailbox;
- INFO2("Telling my Predecessor %d about my departure via mailbox %s",
+ XBT_INFO("Telling my Predecessor %d about my departure via mailbox %s",
node->pred_id, to_mailbox);
req_data->type = TASK_SUCCESSOR_LEAVING;
}
{
int successor = -1;
int stop = 0;
- char* mailbox = get_mailbox(ask_to);
+ char mailbox[MAILBOX_NAME_SIZE];
+ get_mailbox(ask_to, mailbox);
task_data_t req_data = xbt_new0(s_task_data_t, 1);
req_data->type = TASK_FIND_SUCCESSOR;
req_data->request_id = id;
- req_data->answer_to = node->mailbox;
+ get_mailbox(node->id, req_data->answer_to);
req_data->issuer_host_name = MSG_host_get_name(MSG_host_self());
// send a "Find Successor" request to ask_to_id
- m_task_t task = MSG_task_create(NULL, COMP_SIZE, COMM_SIZE, req_data);
- DEBUG3("Sending a 'Find Successor' request (task %p) to %d for id %d", task, ask_to, id);
- MSG_error_t res = MSG_task_send_with_timeout(task, mailbox, 50);
+ m_task_t task_sent = MSG_task_create(NULL, COMP_SIZE, COMM_SIZE, req_data);
+ XBT_DEBUG("Sending a 'Find Successor' request (task %p) to %d for id %d", task_sent, ask_to, id);
+ MSG_error_t res = MSG_task_send_with_timeout(task_sent, mailbox, timeout);
if (res != MSG_OK) {
- DEBUG2("Failed to send the 'Find Successor' request to %d for id %d", ask_to, id);
- MSG_task_destroy(task);
- xbt_free(req_data);
+ XBT_DEBUG("Failed to send the 'Find Successor' request (task %p) to %d for id %d",
+ task_sent, ask_to, id);
+ task_free(task_sent);
}
else {
// receive the answer
- DEBUG3("Sent a 'Find Successor' request (task %p) to %d for key %d, waiting for the answer",
- task, ask_to, id);
+ XBT_DEBUG("Sent a 'Find Successor' request (task %p) to %d for key %d, waiting for the answer",
+ task_sent, ask_to, id);
do {
if (node->comm_receive == NULL) {
- task = NULL;
- node->comm_receive = MSG_task_irecv(&task, node->mailbox);
+ m_task_t task_received = NULL;
+ node->comm_receive = MSG_task_irecv(&task_received, node->mailbox);
}
- res = MSG_comm_wait(node->comm_receive, 50);
+ res = MSG_comm_wait(node->comm_receive, timeout);
if (res != MSG_OK) {
- DEBUG2("Failed to receive the answer to my 'Find Successor' request (task %p): %d", task, res);
+ XBT_DEBUG("Failed to receive the answer to my 'Find Successor' request (task %p): %d",
+ task_sent, res);
stop = 1;
-// MSG_comm_destroy(node->comm_receive);
+ MSG_comm_destroy(node->comm_receive);
+ node->comm_receive = NULL;
}
else {
- task = MSG_comm_get_task(node->comm_receive);
- task_data_t ans_data = MSG_task_get_data(task);
-
- if (ans_data->type != TASK_FIND_SUCCESSOR_ANSWER) {
- handle_task(node, task);
+ m_task_t task_received = MSG_comm_get_task(node->comm_receive);
+ XBT_DEBUG("Received a task (%p)", task_received);
+ task_data_t ans_data = MSG_task_get_data(task_received);
+
+ if (MC_IS_ENABLED) {
+ MC_assert(task_received == task_sent);
+ }
+
+ if (task_received != task_sent) {
+ // this is not the expected answer
+ MSG_comm_destroy(node->comm_receive);
+ node->comm_receive = NULL;
+ handle_task(node, task_received);
}
else {
- DEBUG3("Received the answer to my 'Find Successor' request (task %p): the successor of key %d is %d",
- task, id, successor);
+ // this is our answer
+ XBT_DEBUG("Received the answer to my 'Find Successor' request for id %d (task %p): the successor of key %d is %d",
+ ans_data->request_id, task_received, id, ans_data->answer_id);
successor = ans_data->answer_id;
stop = 1;
- MSG_task_destroy(task);
- xbt_free(req_data);
+ MSG_comm_destroy(node->comm_receive);
+ node->comm_receive = NULL;
+ task_free(task_received);
}
}
- node->comm_receive = NULL;
} while (!stop);
}
- xbt_free(mailbox);
return successor;
}
{
int predecessor_id = -1;
int stop = 0;
- char* mailbox = get_mailbox(ask_to);
+ char mailbox[MAILBOX_NAME_SIZE];
+ get_mailbox(ask_to, mailbox);
task_data_t req_data = xbt_new0(s_task_data_t, 1);
req_data->type = TASK_GET_PREDECESSOR;
- req_data->answer_to = node->mailbox;
+ get_mailbox(node->id, req_data->answer_to);
req_data->issuer_host_name = MSG_host_get_name(MSG_host_self());
// send a "Get Predecessor" request to ask_to_id
- DEBUG1("Sending a 'Get Predecessor' request to %d", ask_to);
- m_task_t task = MSG_task_create(NULL, COMP_SIZE, COMM_SIZE, req_data);
- MSG_error_t res = MSG_task_send_with_timeout(task, mailbox, 50);
+ XBT_DEBUG("Sending a 'Get Predecessor' request to %d", ask_to);
+ m_task_t task_sent = MSG_task_create(NULL, COMP_SIZE, COMM_SIZE, req_data);
+ MSG_error_t res = MSG_task_send_with_timeout(task_sent, mailbox, timeout);
if (res != MSG_OK) {
- DEBUG1("Failed to send the 'Get Predecessor' request to %d", ask_to);
- MSG_task_destroy(task);
- xbt_free(req_data);
+ XBT_DEBUG("Failed to send the 'Get Predecessor' request (task %p) to %d",
+ task_sent, ask_to);
+ task_free(task_sent);
}
else {
// receive the answer
- DEBUG2("Sent 'Get Predecessor' request to %d, waiting for the answer on my mailbox '%s'", ask_to, req_data->answer_to);
+ XBT_DEBUG("Sent 'Get Predecessor' request (task %p) to %d, waiting for the answer on my mailbox '%s'",
+ task_sent, ask_to, req_data->answer_to);
do {
if (node->comm_receive == NULL) { // FIXME simplify this
- task = NULL;
- node->comm_receive = MSG_task_irecv(&task, node->mailbox);
+ m_task_t task_received = NULL;
+ node->comm_receive = MSG_task_irecv(&task_received, node->mailbox);
}
- res = MSG_comm_wait(node->comm_receive, 50);
+ res = MSG_comm_wait(node->comm_receive, timeout);
if (res != MSG_OK) {
- DEBUG1("Failed to receive the answer to my 'Get Predecessor' request: %d", res);
+ XBT_DEBUG("Failed to receive the answer to my 'Get Predecessor' request (task %p): %d",
+ task_sent, res);
stop = 1;
-// MSG_comm_destroy(node->comm_receive);
+ MSG_comm_destroy(node->comm_receive);
+ node->comm_receive = NULL;
}
else {
- task = MSG_comm_get_task(node->comm_receive);
- task_data_t ans_data = MSG_task_get_data(task);
+ m_task_t task_received = MSG_comm_get_task(node->comm_receive);
+ task_data_t ans_data = MSG_task_get_data(task_received);
+
+ if (MC_IS_ENABLED) {
+ MC_assert(task_received == task_sent);
+ }
- if (ans_data->type != TASK_GET_PREDECESSOR_ANSWER) {
- handle_task(node, task);
+ if (task_received != task_sent) {
+ MSG_comm_destroy(node->comm_receive);
+ node->comm_receive = NULL;
+ handle_task(node, task_received);
}
else {
- DEBUG2("Received the answer to my 'Get Predecessor' request: the predecessor of node %d is %d", ask_to, predecessor_id);
+ XBT_DEBUG("Received the answer to my 'Get Predecessor' request (task %p): the predecessor of node %d is %d",
+ task_received, ask_to, ans_data->answer_id);
predecessor_id = ans_data->answer_id;
stop = 1;
- MSG_task_destroy(task);
- xbt_free(req_data);
+ MSG_comm_destroy(node->comm_receive);
+ node->comm_receive = NULL;
+ task_free(task_received);
}
}
- node->comm_receive = NULL;
} while (!stop);
}
- xbt_free(mailbox);
return predecessor_id;
}
int closest_preceding_node(node_t node, int id)
{
int i;
- for (i = NB_BITS - 1; i >= 0; i--) {
+ for (i = nb_bits - 1; i >= 0; i--) {
if (is_in_interval(node->fingers[i].id, node->id + 1, id - 1)) {
return node->fingers[i].id;
}
*/
static void stabilize(node_t node)
{
- DEBUG0("Stabilizing node");
+ XBT_DEBUG("Stabilizing node");
// get the predecessor of my immediate successor
int candidate_id;
print_finger_table(node);
}
else {
- DEBUG1("I don't have to change my predecessor to %d", predecessor_candidate_id);
+ XBT_DEBUG("I don't have to change my predecessor to %d", predecessor_candidate_id);
}
}
req_data->issuer_host_name = MSG_host_get_name(MSG_host_self());
// send a "Notify" request to notify_id
- DEBUG1("Sending a 'Notify' request to %d", notify_id);
m_task_t task = MSG_task_create(NULL, COMP_SIZE, COMM_SIZE, req_data);
- char* mailbox = get_mailbox(notify_id);
- msg_comm_t comm = MSG_task_isend(task, mailbox);
- xbt_dynar_push(node->comms, &comm);
- xbt_free(mailbox);
+ XBT_DEBUG("Sending a 'Notify' request (task %p) to %d", task, notify_id);
+ char mailbox[MAILBOX_NAME_SIZE];
+ get_mailbox(notify_id, mailbox);
+ MSG_task_dsend(task, mailbox, task_free);
}
/**
*/
static void fix_fingers(node_t node) {
- DEBUG0("Fixing fingers");
+ XBT_DEBUG("Fixing fingers");
int i = node->next_finger_to_fix;
int id = find_successor(node, node->id + powers2[i]);
if (id != -1) {
set_finger(node, i, id);
print_finger_table(node);
}
- node->next_finger_to_fix = (i + 1) % NB_BITS;
+ node->next_finger_to_fix = (i + 1) % nb_bits;
}
}
*/
static void check_predecessor(node_t node)
{
- DEBUG0("Checking whether my predecessor is alive");
+ XBT_DEBUG("Checking whether my predecessor is alive");
// TODO
}
+/**
+ * \brief Performs a find successor request to a random id.
+ * \param node the current node
+ */
+static void random_lookup(node_t node)
+{
+ int id = 1337; // TODO pick a pseudorandom id
+ XBT_DEBUG("Making a lookup request for id %d", id);
+ find_successor(node, id);
+}
+
/**
* \brief Main function.
*/
int main(int argc, char *argv[])
{
+ xbt_os_timer_t timer = xbt_os_timer_new();
+
if (argc < 3) {
- printf("Usage: %s platform_file deployment_file\n", argv[0]);
+ printf("Usage: %s [-nb_bits=n] [-timeout=t] platform_file deployment_file\n", argv[0]);
printf("example: %s ../msg_platform.xml chord.xml\n", argv[0]);
exit(1);
}
- const char* platform_file = argv[1];
- const char* application_file = argv[2];
+ MSG_global_init(&argc, argv);
+
+ char **options = &argv[1];
+ while (!strncmp(options[0], "-", 1)) {
+
+ int length = strlen("-nb_bits=");
+ if (!strncmp(options[0], "-nb_bits=", length) && strlen(options[0]) > length) {
+ nb_bits = atoi(options[0] + length);
+ XBT_DEBUG("Set nb_bits to %d", nb_bits);
+ }
+ else {
+
+ length = strlen("-timeout=");
+ if (!strncmp(options[0], "-timeout=", length) && strlen(options[0]) > length) {
+ timeout = atoi(options[0] + length);
+ XBT_DEBUG("Set timeout to %d", timeout);
+ }
+ else {
+ xbt_die("Invalid chord option '%s'", options[0]);
+ }
+ }
+ options++;
+ }
+
+ const char* platform_file = options[0];
+ const char* application_file = options[1];
chord_initialize();
- MSG_global_init(&argc, argv);
MSG_set_channel_number(0);
MSG_create_environment(platform_file);
MSG_function_register("node", node);
MSG_launch_application(application_file);
+ xbt_os_timer_start(timer);
MSG_error_t res = MSG_main();
- INFO1("Simulation time: %g", MSG_get_clock());
+ xbt_os_timer_stop(timer);
+ XBT_CRITICAL("Simulation time %lf", xbt_os_timer_elapsed(timer));
+ XBT_INFO("Simulated time: %g", MSG_get_clock());
MSG_clean();
