src/smpi/smpi_receiver.c

   1 #include "private.h"
   2
   3 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_receiver, smpi,
   4                                 "Logging specific to SMPI (receiver)");
   5
   6 int smpi_receiver(int argc, char*argv[])
   7 {
   8         smpi_host_data_t mydata = SIMIX_process_get_data(SIMIX_process_self());
   9   smx_process_t self;
  10   int index = mydata->index;
  11
  12   xbt_fifo_t request_queue;
  13   xbt_fifo_t message_queue;
  14
  15   smpi_mpi_request_t request;
  16   smpi_received_message_t message;
  17
  18   xbt_fifo_item_t request_item;
  19   xbt_fifo_item_t message_item;
  20
  21   self = SIMIX_process_self();
  22
  23   request_queue = mydata->pending_recv_request_queue;
  24   message_queue = mydata->received_message_queue;
  25
  26   while (1) {
  27     // FIXME: better algorithm, maybe some kind of balanced tree? or a heap?
  28
  29         xbt_fifo_foreach(request_queue,request_item,request,smpi_mpi_request_t){
  30           xbt_fifo_foreach(message_queue,message_item,message, smpi_received_message_t) {
  31
  32         if (request->comm == message->comm &&
  33             (MPI_ANY_SOURCE == request->src || request->src == message->src)
  34             && (MPI_ANY_TAG == request->tag || request->tag == message->tag)) {
  35           xbt_fifo_remove_item(request_queue, request_item);
  36           xbt_fifo_free_item(request_item);
  37           xbt_fifo_remove_item(message_queue, message_item);
  38           xbt_fifo_free_item(message_item);
  39           goto stopsearch;
  40         }
  41       }
  42     }
  43
  44     request = NULL;
  45     message = NULL;
  46
  47   stopsearch:
  48   if (NULL != request) {
  49           if (NULL == message)
  50                   DIE_IMPOSSIBLE;
  51
  52           SIMIX_mutex_lock(request->mutex);
  53           memcpy(request->buf, message->buf,
  54                           request->datatype->size * request->count);
  55           request->src = message->src;
  56           request->data = message->data;
  57           request->forward = message->forward;
  58
  59           if (0 == request->forward) {
  60                   request->completed = 1;
  61                   SIMIX_cond_broadcast(request->cond);
  62           } else {
  63                   request->src = request->comm->index_to_rank_map[index];
  64                   request->dst = (request->src + 1) % request->comm->size;
  65                   smpi_mpi_isend(request);
  66           }
  67
  68           SIMIX_mutex_unlock(request->mutex);
  69
  70           xbt_free(message->buf);
  71           xbt_mallocator_release(smpi_global->message_mallocator, message);
  72
  73     } else if (mydata->finalize>0) { /* main wants me to die and nothing to do */
  74         // FIXME: display the list of remaining requests and messages (user code synchronization faulty?)
  75         mydata->finalize--;
  76         SIMIX_cond_signal(mydata->cond);
  77         return 0;
  78     } else {
  79         SIMIX_process_suspend(self);
  80     }
  81   }
  82
  83   return 0;
  84 }