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   smx_process_t self;
   9   int index;
  10
  11   xbt_fifo_t request_queue;
  12   xbt_fifo_t message_queue;
  13
  14   int running_hosts_count;
  15
  16   smpi_mpi_request_t request;
  17   smpi_received_message_t message;
  18
  19   xbt_fifo_item_t request_item;
  20   xbt_fifo_item_t message_item;
  21
  22   self = SIMIX_process_self();
  23
  24   index = smpi_host_index();
  25
  26   request_queue = smpi_global->pending_recv_request_queues[index];
  27   message_queue = smpi_global->received_message_queues[index];
  28
  29   smpi_global->receiver_processes[index] = self;
  30
  31   do {
  32
  33     // FIXME: better algorithm, maybe some kind of balanced tree? or a heap?
  34
  35         xbt_fifo_foreach(request_queue,request_item,request,smpi_mpi_request_t){
  36           xbt_fifo_foreach(message_queue,message_item,message, smpi_received_message_t) {
  37
  38         if (request->comm == message->comm &&
  39             (MPI_ANY_SOURCE == request->src || request->src == message->src)
  40             && (MPI_ANY_TAG == request->tag || request->tag == message->tag)) {
  41           xbt_fifo_remove_item(request_queue, request_item);
  42           xbt_fifo_free_item(request_item);
  43           xbt_fifo_remove_item(message_queue, message_item);
  44           xbt_fifo_free_item(message_item);
  45           goto stopsearch;
  46         }
  47       }
  48     }
  49
  50     request = NULL;
  51     message = NULL;
  52
  53   stopsearch:
  54     if (NULL == request || NULL == message) {
  55       SIMIX_process_suspend(self);
  56     } else {
  57
  58       SIMIX_mutex_lock(request->mutex);
  59       memcpy(request->buf, message->buf,
  60              request->datatype->size * request->count);
  61       request->src = message->src;
  62       request->data = message->data;
  63       request->forward = message->forward;
  64
  65       if (0 == request->forward) {
  66         request->completed = 1;
  67         SIMIX_cond_broadcast(request->cond);
  68       } else {
  69         request->src = request->comm->index_to_rank_map[index];
  70         request->dst = (request->src + 1) % request->comm->size;
  71         smpi_mpi_isend(request);
  72       }
  73
  74       SIMIX_mutex_unlock(request->mutex);
  75
  76       xbt_free(message->buf);
  77       xbt_mallocator_release(smpi_global->message_mallocator, message);
  78
  79     }
  80
  81     running_hosts_count = smpi_global->running_hosts_count;
  82
  83   } while (0 < running_hosts_count);
  84
  85   return 0;
  86 }