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_process_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,
  31                        smpi_received_message_t) {
  32
  33         if (request->comm == message->comm &&
  34             (MPI_ANY_SOURCE == request->src || request->src == message->src)
  35             && (MPI_ANY_TAG == request->tag || request->tag == message->tag)) {
  36           xbt_fifo_remove_item(request_queue, request_item);
  37           xbt_fifo_free_item(request_item);
  38           xbt_fifo_remove_item(message_queue, message_item);
  39           xbt_fifo_free_item(message_item);
  40           goto stopsearch;
  41         }
  42       }
  43     }
  44
  45     request = NULL;
  46     message = NULL;
  47
  48   stopsearch:
  49     if (NULL != request) {
  50       if (NULL == message)
  51         DIE_IMPOSSIBLE;
  52
  53       SIMIX_mutex_lock(request->mutex);
  54       memcpy(request->buf, message->buf,
  55              request->datatype->size * request->count);
  56       request->src = message->src;
  57       request->data = message->data;
  58       request->forward = message->forward;
  59
  60       if (0 == request->forward) {
  61         request->completed = 1;
  62         SIMIX_cond_broadcast(request->cond);
  63       } else {
  64         request->src = request->comm->index_to_rank_map[index];
  65         request->dst = (request->src + 1) % request->comm->size;
  66         smpi_mpi_isend(request);
  67       }
  68
  69       SIMIX_mutex_unlock(request->mutex);
  70
  71       xbt_free(message->buf);
  72       xbt_mallocator_release(smpi_global->message_mallocator, message);
  73
  74     } else if (mydata->finalize > 0) {  /* main wants me to die and nothing to do */
  75       // FIXME: display the list of remaining requests and messages (user code synchronization faulty?)
  76       mydata->finalize--;
  77       SIMIX_cond_signal(mydata->cond);
  78       return 0;
  79     } else {
  80       SIMIX_process_suspend(self);
  81     }
  82   }
  83
  84   return 0;
  85 }