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   smx_mutex_t request_queue_mutex;
  13   xbt_fifo_t message_queue;
  14   smx_mutex_t message_queue_mutex;
  15
  16   int running_hosts_count;
  17
  18   smpi_mpi_request_t request;
  19   smpi_received_message_t message;
  20
  21   xbt_fifo_item_t request_item;
  22   xbt_fifo_item_t message_item;
  23
  24   self = SIMIX_process_self();
  25
  26   index = smpi_host_index();
  27
  28   request_queue = smpi_global->pending_recv_request_queues[index];
  29   request_queue_mutex =
  30     smpi_global->pending_recv_request_queues_mutexes[index];
  31   message_queue = smpi_global->received_message_queues[index];
  32   message_queue_mutex = smpi_global->received_message_queues_mutexes[index];
  33
  34   smpi_global->receiver_processes[index] = self;
  35
  36   do {
  37
  38     // FIXME: better algorithm, maybe some kind of balanced tree? or a heap?
  39
  40     // FIXME: not the best way to request multiple locks...
  41     SIMIX_mutex_lock(request_queue_mutex);
  42     SIMIX_mutex_lock(message_queue_mutex);
  43     for (request_item = xbt_fifo_get_first_item(request_queue);
  44          NULL != request_item;
  45          request_item = xbt_fifo_get_next_item(request_item)) {
  46       request = xbt_fifo_get_item_content(request_item);
  47       for (message_item = xbt_fifo_get_first_item(message_queue);
  48            NULL != message_item;
  49            message_item = xbt_fifo_get_next_item(message_item)) {
  50         message = xbt_fifo_get_item_content(message_item);
  51         if (request->comm == message->comm &&
  52             (MPI_ANY_SOURCE == request->src || request->src == message->src)
  53             && (MPI_ANY_TAG == request->tag || request->tag == message->tag)) {
  54           xbt_fifo_remove_item(request_queue, request_item);
  55           xbt_fifo_free_item(request_item);
  56           xbt_fifo_remove_item(message_queue, message_item);
  57           xbt_fifo_free_item(message_item);
  58           goto stopsearch;
  59         }
  60       }
  61     }
  62
  63     request = NULL;
  64     message = NULL;
  65
  66   stopsearch:
  67     SIMIX_mutex_unlock(message_queue_mutex);
  68     SIMIX_mutex_unlock(request_queue_mutex);
  69
  70     if (NULL == request || NULL == message) {
  71       SIMIX_process_suspend(self);
  72     } else {
  73
  74       SIMIX_mutex_lock(request->mutex);
  75       memcpy(request->buf, message->buf,
  76              request->datatype->size * request->count);
  77       request->src = message->src;
  78       request->data = message->data;
  79       request->forward = message->forward;
  80
  81       if (0 == request->forward) {
  82         request->completed = 1;
  83         SIMIX_cond_broadcast(request->cond);
  84       } else {
  85         request->src = request->comm->index_to_rank_map[index];
  86         request->dst = (request->src + 1) % request->comm->size;
  87         smpi_mpi_isend(request);
  88       }
  89
  90       SIMIX_mutex_unlock(request->mutex);
  91
  92       xbt_free(message->buf);
  93       xbt_mallocator_release(smpi_global->message_mallocator, message);
  94
  95     }
  96
  97     SIMIX_mutex_lock(smpi_global->running_hosts_count_mutex);
  98     running_hosts_count = smpi_global->running_hosts_count;
  99     SIMIX_mutex_unlock(smpi_global->running_hosts_count_mutex);
 100
 101   } while (0 < running_hosts_count);
 102
 103   return 0;
 104 }