+MSG_error_t MSG_task_get_ext(m_task_t * task,
+ m_channel_t channel,
+ double max_duration,
+ m_host_t host)
+{
+
+ m_process_t process = MSG_process_self();
+ m_task_t t = NULL;
+ m_host_t h = NULL;
+ simdata_task_t t_simdata = NULL;
+ simdata_host_t h_simdata = NULL;
+ int first_time = 1;
+ xbt_fifo_item_t item = NULL;
+
+ smx_cond_t cond = NULL; //conditional wait if the task isn't on the channel yet
+
+ CHECK_HOST();
+ xbt_assert1((channel >= 0)
+ && (channel < msg_global->max_channel), "Invalid channel %d",
+ channel);
+ /* Sanity check */
+ xbt_assert0(task, "Null pointer for the task storage");
+
+ if (*task)
+ CRITICAL0
+ ("MSG_task_get() was asked to write in a non empty task struct.");
+
+ /* Get the task */
+ h = MSG_host_self();
+ h_simdata = h->simdata;
+
+ DEBUG2("Waiting for a task on channel %d (%s)", channel, h->name);
+
+ SIMIX_mutex_lock(h->simdata->mutex);
+ while (1) {
+ if (xbt_fifo_size(h_simdata->mbox[channel]) > 0) {
+ if (!host) {
+ t = xbt_fifo_shift(h_simdata->mbox[channel]);
+ break;
+ } else {
+ xbt_fifo_foreach(h->simdata->mbox[channel], item, t, m_task_t) {
+ if (t->simdata->source == host)
+ break;
+ }
+ if (item) {
+ xbt_fifo_remove_item(h->simdata->mbox[channel], item);
+ break;
+ }
+ }
+ }
+
+ if (max_duration > 0) {
+ if (!first_time) {
+ SIMIX_mutex_unlock(h->simdata->mutex);
+ h_simdata->sleeping[channel] = NULL;
+ SIMIX_cond_destroy(cond);
+ MSG_RETURN(MSG_TRANSFER_FAILURE);
+ }
+ }
+ xbt_assert1(!(h_simdata->sleeping[channel]),
+ "A process is already blocked on channel %d", channel);
+
+ cond = SIMIX_cond_init();
+ h_simdata->sleeping[channel] = cond;
+ if (max_duration > 0)
+ SIMIX_cond_wait_timeout(cond, h->simdata->mutex, max_duration);
+ else
+ SIMIX_cond_wait(h_simdata->sleeping[channel], h->simdata->mutex);
+
+ if (SIMIX_host_get_state(h_simdata->smx_host) == 0)
+ MSG_RETURN(MSG_HOST_FAILURE);
+
+ first_time = 0;
+ }
+ SIMIX_mutex_unlock(h->simdata->mutex);
+
+ DEBUG1("OK, got a task (%s)", t->name);
+ /* clean conditional */
+ if (cond) {
+ SIMIX_cond_destroy(cond);
+ h_simdata->sleeping[channel] = NULL;
+ }
+
+ t_simdata = t->simdata;
+ t_simdata->receiver = process;
+ *task = t;
+
+ SIMIX_mutex_lock(t_simdata->mutex);
+
+ /* Transfer */
+ /* create SIMIX action to the communication */
+ t_simdata->comm =
+ SIMIX_action_communicate(t_simdata->sender->simdata->m_host->
+ simdata->smx_host,
+ process->simdata->m_host->simdata->smx_host,
+ t->name, t_simdata->message_size,
+ t_simdata->rate);
+ /* if the process is suspend, create the action but stop its execution, it will be restart when the sender process resume */
+ if (MSG_process_is_suspended(t_simdata->sender)) {
+ DEBUG1("Process sender (%s) suspended", t_simdata->sender->name);
+ SIMIX_action_set_priority(t_simdata->comm, 0);
+ }
+ process->simdata->waiting_task = t;
+ SIMIX_register_action_to_condition(t_simdata->comm, t_simdata->cond);
+ while (1) {
+ SIMIX_cond_wait(t_simdata->cond, t_simdata->mutex);
+ if (SIMIX_action_get_state(t_simdata->comm) != SURF_ACTION_RUNNING)
+ break;
+ }
+ SIMIX_unregister_action_to_condition(t_simdata->comm, t_simdata->cond);
+ process->simdata->waiting_task = NULL;
+
+ /* the task has already finished and the pointer must be null */
+ if (t->simdata->sender) {
+ t->simdata->sender->simdata->waiting_task = NULL;
+ /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */
+ //t->simdata->comm = NULL;
+ //t->simdata->compute = NULL;
+ }
+ /* for this process, don't need to change in get function */
+ t->simdata->receiver = NULL;
+ SIMIX_mutex_unlock(t_simdata->mutex);
+
+
+ if (SIMIX_action_get_state(t_simdata->comm) == SURF_ACTION_DONE) {
+ //t_simdata->comm = NULL;
+ SIMIX_action_destroy(t_simdata->comm);
+ t_simdata->comm = NULL;
+ t_simdata->using--;
+ MSG_RETURN(MSG_OK);
+ } else if (SIMIX_host_get_state(h_simdata->smx_host) == 0) {
+ //t_simdata->comm = NULL;
+ SIMIX_action_destroy(t_simdata->comm);
+ t_simdata->comm = NULL;
+ t_simdata->using--;
+ MSG_RETURN(MSG_HOST_FAILURE);
+ } else {
+ //t_simdata->comm = NULL;
+ SIMIX_action_destroy(t_simdata->comm);
+ t_simdata->comm = NULL;
+ t_simdata->using--;
+ MSG_RETURN(MSG_TRANSFER_FAILURE);
+ }
+
+}
+