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 = smpi_global->pending_recv_request_queues[index];
  26   message_queue = smpi_global->received_message_queues[index];
  27
  28   smpi_global->receiver_processes[index] = self;
  29
  30   do {
  31
  32     // FIXME: better algorithm, maybe some kind of balanced tree? or a heap?
  33
  34         xbt_fifo_foreach(request_queue,request_item,request,smpi_mpi_request_t){
  35           xbt_fifo_foreach(message_queue,message_item,message, smpi_received_message_t) {
  36
  37         if (request->comm == message->comm &&
  38             (MPI_ANY_SOURCE == request->src || request->src == message->src)
  39             && (MPI_ANY_TAG == request->tag || request->tag == message->tag)) {
  40           xbt_fifo_remove_item(request_queue, request_item);
  41           xbt_fifo_free_item(request_item);
  42           xbt_fifo_remove_item(message_queue, message_item);
  43           xbt_fifo_free_item(message_item);
  44           goto stopsearch;
  45         }
  46       }
  47     }
  48
  49     request = NULL;
  50     message = NULL;
  51
  52   stopsearch:
  53     if (NULL == request || NULL == message) {
  54       SIMIX_process_suspend(self);
  55     } else {
  56
  57       SIMIX_mutex_lock(request->mutex);
  58       memcpy(request->buf, message->buf,
  59              request->datatype->size * request->count);
  60       request->src = message->src;
  61       request->data = message->data;
  62       request->forward = message->forward;
  63
  64       if (0 == request->forward) {
  65         request->completed = 1;
  66         SIMIX_cond_broadcast(request->cond);
  67       } else {
  68         request->src = request->comm->index_to_rank_map[index];
  69         request->dst = (request->src + 1) % request->comm->size;
  70         smpi_mpi_isend(request);
  71       }
  72
  73       SIMIX_mutex_unlock(request->mutex);
  74
  75       xbt_free(message->buf);
  76       xbt_mallocator_release(smpi_global->message_mallocator, message);
  77
  78     }
  79
  80     running_hosts_count = smpi_global->running_hosts_count;
  81
  82   } while (0 < running_hosts_count);
  83
  84   return 0;
  85 }