DEBUG0("Communication request found!");
xbt_fifo_shift(rdv->comm_fifo);
SIMIX_communication_use(comm);
+ comm->rdv = NULL;
return comm;
}
/* no relevant request found. Return NULL */
- DEBUG0("Communication request not found");
+ DEBUG0("Communication request not found. I assume that other side will arrive later on.");
return NULL;
}
+/**
+ * \brief counts the number of communication requests of a given host pending
+ * on a rendez-vous point
+ * \param rdv The rendez-vous point
+ * \param host The host to be counted
+ * \return The number of comm request pending in the rdv
+ */
+int
+SIMIX_rdv_get_count_waiting_comm(smx_rdv_t rdv, smx_host_t host)
+{
+ smx_comm_t comm = NULL;
+ xbt_fifo_item_t item = NULL;
+ int count = 0;
+
+ xbt_fifo_foreach(rdv->comm_fifo, item, comm, smx_comm_t) {
+ if (comm->src_proc->smx_host == host)
+ count++;
+ }
+
+ return count;
+}
+
+/**
+ * \brief returns the communication at the head of the rendez-vous
+ * \param rdv The rendez-vous point
+ * \return The communication or NULL if empty
+ */
+smx_comm_t SIMIX_rdv_get_head(smx_rdv_t rdv)
+{
+ return (smx_comm_t)xbt_fifo_get_item_content(xbt_fifo_get_first_item(rdv->comm_fifo));
+}
+
+/** @brief adds some API-related data to the rendez-vous point */
+void SIMIX_rdv_set_data(smx_rdv_t rdv,void *data) {
+ rdv->data=data;
+}
+/** @brief gets API-related data from the rendez-vous point */
+void *SIMIX_rdv_get_data(smx_rdv_t rdv) {
+ return rdv->data;
+}
+
/******************************************************************************/
/* Communication Requests */
/******************************************************************************/
/* alloc structures */
smx_comm_t comm = xbt_new0(s_smx_comm_t, 1);
comm->type = type;
- comm->cond = SIMIX_cond_init();
+ comm->sem = SIMIX_sem_init(0);
comm->refcount = 1;
return comm;
void SIMIX_communication_destroy(smx_comm_t comm)
{
comm->refcount--;
- if(comm->refcount == 0){
- if(comm->act != NULL)
- SIMIX_action_destroy(comm->act);
+ if(comm->refcount > 0)
+ return;
- xbt_free(comm->cond);
- xbt_free(comm);
+ if(comm->sem){
+ SIMIX_sem_destroy(comm->sem);
+ comm->sem = NULL;
}
+
+ if(comm->act){
+ SIMIX_action_destroy(comm->act);
+ comm->act = NULL;
+ }
+
+ xbt_free(comm);
}
/**
/**
* \brief Start the simulation of a communication request
- * \param comm The communication request
+ * \param comm The comm->rdv = NULL;communication request
*/
static inline void SIMIX_communication_start(smx_comm_t comm)
{
comm->task_size, comm->rate);
/* If any of the process is suspend, create the action but stop its execution,
- it will be restart when the sender process resume */
+ it will be restarted when the sender process resume */
if(SIMIX_process_is_suspended(comm->src_proc) ||
SIMIX_process_is_suspended(comm->dst_proc)) {
SIMIX_action_set_priority(comm->act, 0);
/* Add the communication as user data of the action */
comm->act->data = comm;
-
- SIMIX_register_action_to_condition(comm->act, comm->cond);
- }else{
- DEBUG1("Communication %p cannot be started, peer missing", comm);
+
+ /* The semaphore will only get signaled once, but since the first unlocked guy will
+ * release_forever() the semaphore, that will unlock the second (and any other)
+ * communication partner */
+ SIMIX_register_action_to_semaphore(comm->act, comm->sem);
}
}
if(timeout > 0){
TRY{
- SIMIX_cond_wait_timeout(comm->cond, NULL, timeout);
+ SIMIX_sem_acquire_timeout(comm->sem, timeout);
}
CATCH(e){
- /* If it's a timeout then cancel the communication and signal the other peer */
+ /* If there is a timeout then cancel the communication if it is running or
+ remove it from the rendez-vous otherwise. Then signal the other peer,
+ destroy the communication and retrow the exception. */
if(e.category == timeout_error){
DEBUG1("Communication timeout! %p", comm);
if(comm->act && SIMIX_action_get_state(comm->act) == SURF_ACTION_RUNNING)
- SIMIX_action_cancel(comm->act);
+ SIMIX_communication_cancel(comm);
else
SIMIX_rdv_remove(comm->rdv, comm);
-
- SIMIX_cond_signal(comm->cond);
+
+ /* Make sure that everyone sleeping on that semaphore is awake, and that nobody will ever block on it */
+ SIMIX_sem_release_forever(comm->sem);
SIMIX_communication_destroy(comm);
}
RETHROW;
}
- }else{
- SIMIX_cond_wait(comm->cond, NULL);
+ } else {
+ SIMIX_sem_acquire(comm->sem);
}
DEBUG1("Communication %p complete! Let's check for errors", comm);
+
+ /* Make sure that everyone sleeping on that semaphore is awake, and that nobody will ever block on it */
+ SIMIX_sem_release_forever(comm->sem);
- /* Check for errors */
+ /* Check for errors other than timeouts (they are catched above) */
if(!SIMIX_host_get_state(SIMIX_host_self())){
+ if(comm->rdv)
+ SIMIX_rdv_remove(comm->rdv, comm);
SIMIX_communication_destroy(comm);
THROW0(host_error, 0, "Host failed");
} else if (SIMIX_action_get_state(comm->act) == SURF_ACTION_FAILED){
SIMIX_communication_destroy(comm);
THROW0(network_error, 0, "Link failure");
}
+}
- SIMIX_unregister_action_to_condition(comm->act, comm->cond);
+/**
+ * \brief Cancels a communication
+ * \brief comm The communication to cancel
+ */
+void SIMIX_communication_cancel(smx_comm_t comm)
+{
+ SIMIX_action_cancel(comm->act);
}
+/**
+ * \brief get the amount remaining from the communication
+ * \param comm The communication
+ */
+double SIMIX_communication_get_remains(smx_comm_t comm)
+{
+ return SIMIX_action_get_remains(comm->act);
+}
+
/**
* \brief Copy the communication data from the sender's buffer to the receiver's one
* \param comm The communication
size_t src_buff_size = comm->src_buff_size;
size_t dst_buff_size = *comm->dst_buff_size;
- /* Copy at most dst_buff_size bytes of the message to receiver's buffer */
- dst_buff_size = MIN(dst_buff_size, src_buff_size);
+ xbt_assert(src_buff_size == dst_buff_size);
- /* Update the receiver's buffer size to the copied amount */
- *comm->dst_buff_size = dst_buff_size;
+ /* If there is no data to copy then return */
+ if(!comm->src_buff || !comm->dst_buff || dst_buff_size == 0)
+ return;
memcpy(comm->dst_buff, comm->src_buff, dst_buff_size);
- DEBUG4("Copying comm %p data from %s -> %s (%zu bytes)",
+ DEBUG6("Copying comm %p data from %s -> %s (%zu bytes %p->%p)",
comm, comm->src_proc->smx_host->name, comm->dst_proc->smx_host->name,
- dst_buff_size);
+ dst_buff_size,comm->src_buff,comm->dst_buff);
+}
+
+/**
+ * \brief Return the user data associated to the communication
+ *
+ * In MSG and GRAS, that data is the exchanged task/msg itself, since
+ * (i) In MSG, the receiver still wants to read the task although the communication didn't complete.
+ * (ii) In GRAS, we need to retrieve that gras_msg_t during the select
+ * \param comm The communication
+ * \return the user data
+ */
+void *SIMIX_communication_get_sentdata(smx_comm_t comm)
+{
+ return comm->data;
}
/******************************************************************************/
/* Synchronous Communication */
/******************************************************************************/
-/* Throws:
+/**
+ * \brief Put a send communication request in a rendez-vous point and waits for
+ * its completion (blocking)
+ * \param rdv The rendez-vous point
+ * \param task_size The size of the communication action (for surf simulation)
+ * \param rate The rate of the communication action (for surf)
+ * \param timeout The timeout used for the waiting the completion
+ * \param src_buff The source buffer containing the message to be sent
+ * \param src_buff_size The size of the source buffer
+ * \param comm_ref The communication object used for the send (useful if someone else wants to cancel this communication afterward)
+ * \param data User data associated to the communication object
+ * Throws:
* - host_error if peer failed
* - timeout_error if communication reached the timeout specified
* - network_error if network failed or peer issued a timeout
*/
void SIMIX_network_send(smx_rdv_t rdv, double task_size, double rate,
- double timeout, void *data, size_t data_size)
+ double timeout, void *src_buff, size_t src_buff_size,
+ smx_comm_t *comm_ref, void *data)
+{
+ *comm_ref = SIMIX_network_isend(rdv,task_size,rate,src_buff,src_buff_size,data);
+ SIMIX_network_wait(*comm_ref,timeout);
+}
+
+/**
+ * \brief Put a receive communication request in a rendez-vous point and waits
+ * for its completion (blocking)
+ * \param rdv The rendez-vous point
+ * \param timeout The timeout used for the waiting the completion
+ * \param dst_buff The destination buffer to copy the received message
+ * \param src_buff_size The size of the destination buffer
+ * \param comm_ref The communication object used for the send (useful if someone else wants to cancel this communication afterward)
+ * Throws:
+ * - host_error if peer failed
+ * - timeout_error if communication reached the timeout specified
+ * - network_error if network failed or peer issued a timeout
+ */
+void SIMIX_network_recv(smx_rdv_t rdv, double timeout, void *dst_buff,
+ size_t *dst_buff_size, smx_comm_t *comm_ref)
+{
+ *comm_ref = SIMIX_network_irecv(rdv,dst_buff,dst_buff_size);
+ SIMIX_network_wait(*comm_ref,timeout);
+}
+
+/******************************************************************************/
+/* Asynchronous Communication */
+/******************************************************************************/
+smx_comm_t SIMIX_network_isend(smx_rdv_t rdv, double task_size, double rate,
+ void *src_buff, size_t src_buff_size, void *data)
{
smx_comm_t comm;
-
- /* Look for communication request matching our needs.
+
+ /* Look for communication request matching our needs.
If it is not found then create it and push it into the rendez-vous point */
comm = SIMIX_rdv_get_request(rdv, comm_recv);
comm->src_proc = SIMIX_process_self();
comm->task_size = task_size;
comm->rate = rate;
- comm->src_buff = data;
- comm->src_buff_size = data_size;
+ comm->src_buff = src_buff;
+ comm->src_buff_size = src_buff_size;
+ comm->data = data;
SIMIX_communication_start(comm);
-
- /* Wait for communication completion */
- SIMIX_communication_wait_for_completion(comm, timeout);
-
- SIMIX_communication_destroy(comm);
+ return comm;
}
-/* Throws:
- * - host_error if peer failed
- * - timeout_error if communication reached the timeout specified
- * - network_error if network failed or peer issued a timeout
- */
-void SIMIX_network_recv(smx_rdv_t rdv, double timeout, void *data, size_t *data_size)
-{
+smx_comm_t SIMIX_network_irecv(smx_rdv_t rdv, void *dst_buff, size_t *dst_buff_size) {
smx_comm_t comm;
- /* Look for communication request matching our needs.
+ /* Look for communication request matching our needs.
If it is not found then create it and push it into the rendez-vous point */
comm = SIMIX_rdv_get_request(rdv, comm_send);
/* Setup communication request */
comm->dst_proc = SIMIX_process_self();
- comm->dst_buff = data;
- comm->dst_buff_size = data_size;
+ comm->dst_buff = dst_buff;
+ comm->dst_buff_size = dst_buff_size;
+ DEBUG2("Receive data for %p into %p",comm,comm->dst_buff);
SIMIX_communication_start(comm);
+ return comm;
+}
+/** @brief blocks until the communication terminates or the timeout occurs */
+void SIMIX_network_wait(smx_comm_t comm, double timeout) {
/* Wait for communication completion */
SIMIX_communication_wait_for_completion(comm, timeout);
SIMIX_communication_destroy(comm);
}
-/******************************************************************************/
-/* Asynchronous Communication */
-/******************************************************************************/
-
-/*
-void SIMIX_network_wait(smx_action_t comm, double timeout)
-{
- TO BE IMPLEMENTED
+/** @Returns whether the (asynchronous) communication is done yet or not */
+int SIMIX_network_test(smx_comm_t comm) {
+ return comm->sem?SIMIX_sem_would_block(comm->sem):0;
}
-XBT_PUBLIC(int) SIMIX_network_test(smx_action_t comm)
-{
- TO BE IMPLEMENTED
-}*/
+/** @brief wait for the completion of any communication of a set
+ *
+ * @Returns the rank in the dynar of communication which finished; destroy it after identifying which one it is
+ */
+unsigned int SIMIX_network_waitany(xbt_dynar_t comms) {
+ xbt_dynar_t sems = xbt_dynar_new(sizeof(smx_sem_t),NULL);
+ unsigned int cursor, found_comm=-1;
+ smx_comm_t comm,comm_finished=NULL;
+ xbt_dynar_foreach(comms,cursor,comm){
+ xbt_dynar_push(sems,&(comm->sem));
+ }
+ DEBUG1("Waiting for the completion of communication set %p", comms);
+ found_comm = SIMIX_sem_acquire_any(sems);
+ xbt_assert0(found_comm!=-1,"Cannot find which communication finished");
+ xbt_dynar_get_cpy(comms,found_comm,&comm_finished);
+ DEBUG1("Communication %p complete! Let's check for errors", comm_finished);
+ /* Make sure that everyone sleeping on that semaphore is awake,
+ * and that nobody will ever block on it */
+ SIMIX_sem_release_forever(comm_finished->sem);
+ /* Check for errors */
+ if(!SIMIX_host_get_state(SIMIX_host_self())){
+ if(comm_finished->rdv)
+ SIMIX_rdv_remove(comm_finished->rdv, comm_finished);
+ SIMIX_communication_destroy(comm_finished);
+ THROW0(host_error, 0, "Host failed");
+ } else if (SIMIX_action_get_state(comm_finished->act) == SURF_ACTION_FAILED){
+ SIMIX_communication_destroy(comm_finished);
+ THROW0(network_error, 0, "Link failure");
+ }
+ return found_comm;
+}
