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_process_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   smpi_mpi_request_t request;
  16   smpi_received_message_t message;
  17
  18   xbt_fifo_item_t request_item;
  19   xbt_fifo_item_t message_item;
  20
  21   self = SIMIX_process_self();
  22
  23   request_queue = mydata->pending_recv_request_queue;
  24   message_queue = mydata->received_message_queue;
  25
  26
  27
  28   while (1) {
  29     // FIXME: better algorithm, maybe some kind of balanced tree? or a heap?
  30
  31     xbt_fifo_foreach(request_queue, request_item, request, smpi_mpi_request_t) {
  32       xbt_fifo_foreach(message_queue, message_item, message,
  33                        smpi_received_message_t) {
  34
  35 //#define DEBUG_MATCH
  36 #ifdef DEBUG_MATCH
  37         printf("[%s] try match (req_src=%d,msg_src=%d)x(req_tag=%d,msg_tag=%d)\n",
  38                         __FILE__,request->src,message->src,request->tag, message->tag);
  39 #endif
  40         if (request->comm == message->comm &&
  41             (MPI_ANY_SOURCE == request->src || request->src == message->src)
  42             && (MPI_ANY_TAG == request->tag || request->tag == message->tag)) {
  43           xbt_fifo_remove_item(request_queue, request_item);
  44           xbt_fifo_free_item(request_item);
  45           xbt_fifo_remove_item(message_queue, message_item);
  46           xbt_fifo_free_item(message_item);
  47 #ifdef DEBUG_MATCH
  48         printf("[%s] found match: req_src=%d,msg_src=%d)x(req_tag=%d,msg_tag=%d)\n",
  49                         __FILE__,request->src,message->src,request->tag, message->tag);
  50 #endif
  51           goto stopsearch;
  52         }
  53       }
  54     }
  55
  56     request = NULL;
  57     message = NULL;
  58
  59   stopsearch:
  60     if (NULL != request) {
  61       if (NULL == message)
  62         DIE_IMPOSSIBLE;
  63
  64       SIMIX_mutex_lock(request->mutex);
  65       memcpy(request->buf, message->buf,
  66              request->datatype->size * request->count);
  67       request->src = message->src;
  68       request->data = message->data;
  69       request->forward = message->forward;
  70
  71       if (0 == request->forward) {
  72         request->completed = 1;
  73         SIMIX_cond_broadcast(request->cond);
  74       } else {
  75         request->src = request->comm->index_to_rank_map[index];
  76         request->dst = (request->src + 1) % request->comm->size;
  77         smpi_mpi_isend(request);
  78       }
  79
  80       SIMIX_mutex_unlock(request->mutex);
  81
  82       xbt_free(message->buf);
  83       xbt_mallocator_release(smpi_global->message_mallocator, message);
  84
  85     } else if (mydata->finalize > 0) {  /* main wants me to die and nothing to do */
  86       // FIXME: display the list of remaining requests and messages (user code synchronization faulty?)
  87       mydata->finalize--;
  88       SIMIX_cond_signal(mydata->cond);
  89       return 0;
  90     } else {
  91       SIMIX_process_suspend(self);
  92     }
  93   }
  94
  95   return 0;
  96 }