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     for (request_item = xbt_fifo_get_first_item(request_queue);
  36          NULL != request_item;
  37          request_item = xbt_fifo_get_next_item(request_item)) {
  38       request = xbt_fifo_get_item_content(request_item);
  39       for (message_item = xbt_fifo_get_first_item(message_queue);
  40            NULL != message_item;
  41            message_item = xbt_fifo_get_next_item(message_item)) {
  42         message = xbt_fifo_get_item_content(message_item);
  43         if (request->comm == message->comm &&
  44             (MPI_ANY_SOURCE == request->src || request->src == message->src)
  45             && (MPI_ANY_TAG == request->tag || request->tag == message->tag)) {
  46           xbt_fifo_remove_item(request_queue, request_item);
  47           xbt_fifo_free_item(request_item);
  48           xbt_fifo_remove_item(message_queue, message_item);
  49           xbt_fifo_free_item(message_item);
  50           goto stopsearch;
  51         }
  52       }
  53     }
  54
  55     request = NULL;
  56     message = NULL;
  57
  58   stopsearch:
  59     if (NULL == request || NULL == message) {
  60       SIMIX_process_suspend(self);
  61     } else {
  62
  63       SIMIX_mutex_lock(request->mutex);
  64       memcpy(request->buf, message->buf,
  65              request->datatype->size * request->count);
  66       request->src = message->src;
  67       request->data = message->data;
  68       request->forward = message->forward;
  69
  70       if (0 == request->forward) {
  71         request->completed = 1;
  72         SIMIX_cond_broadcast(request->cond);
  73       } else {
  74         request->src = request->comm->index_to_rank_map[index];
  75         request->dst = (request->src + 1) % request->comm->size;
  76         smpi_mpi_isend(request);
  77       }
  78
  79       SIMIX_mutex_unlock(request->mutex);
  80
  81       xbt_free(message->buf);
  82       xbt_mallocator_release(smpi_global->message_mallocator, message);
  83
  84     }
  85
  86     SIMIX_mutex_lock(smpi_global->running_hosts_count_mutex);
  87     running_hosts_count = smpi_global->running_hosts_count;
  88     SIMIX_mutex_unlock(smpi_global->running_hosts_count_mutex);
  89
  90   } while (0 < running_hosts_count);
  91
  92   return 0;
  93 }