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   int running_hosts_count;
  16
  17   smpi_mpi_request_t request;
  18   smpi_received_message_t message;
  19
  20   xbt_fifo_item_t request_item;
  21   xbt_fifo_item_t message_item;
  22
  23   self = SIMIX_process_self();
  24
  25   request_queue = mydata->pending_recv_request_queue;
  26   message_queue = smpi_global->received_message_queues[index];
  27
  28   do {
  29
  30     // FIXME: better algorithm, maybe some kind of balanced tree? or a heap?
  31
  32         xbt_fifo_foreach(request_queue,request_item,request,smpi_mpi_request_t){
  33           xbt_fifo_foreach(message_queue,message_item,message, smpi_received_message_t) {
  34
  35         if (request->comm == message->comm &&
  36             (MPI_ANY_SOURCE == request->src || request->src == message->src)
  37             && (MPI_ANY_TAG == request->tag || request->tag == message->tag)) {
  38           xbt_fifo_remove_item(request_queue, request_item);
  39           xbt_fifo_free_item(request_item);
  40           xbt_fifo_remove_item(message_queue, message_item);
  41           xbt_fifo_free_item(message_item);
  42           goto stopsearch;
  43         }
  44       }
  45     }
  46
  47     request = NULL;
  48     message = NULL;
  49
  50   stopsearch:
  51     if (NULL == request || NULL == message) {
  52       SIMIX_process_suspend(self);
  53     } else {
  54
  55       SIMIX_mutex_lock(request->mutex);
  56       memcpy(request->buf, message->buf,
  57              request->datatype->size * request->count);
  58       request->src = message->src;
  59       request->data = message->data;
  60       request->forward = message->forward;
  61
  62       if (0 == request->forward) {
  63         request->completed = 1;
  64         SIMIX_cond_broadcast(request->cond);
  65       } else {
  66         request->src = request->comm->index_to_rank_map[index];
  67         request->dst = (request->src + 1) % request->comm->size;
  68         smpi_mpi_isend(request);
  69       }
  70
  71       SIMIX_mutex_unlock(request->mutex);
  72
  73       xbt_free(message->buf);
  74       xbt_mallocator_release(smpi_global->message_mallocator, message);
  75
  76     }
  77
  78     running_hosts_count = smpi_global->running_hosts_count;
  79
  80   } while (0 < running_hosts_count);
  81
  82   return 0;
  83 }