src/smpi/smpi_sender.c

   1 #include "private.h"
   2
   3 int smpi_sender(int argc, char **argv)
   4 {
   5         smx_process_t self;
   6         smx_host_t shost;
   7         int rank;
   8
   9         xbt_fifo_t request_queue;
  10         smx_mutex_t request_queue_mutex;
  11         int size;
  12
  13         int running_hosts_count;
  14
  15         smpi_mpi_request_t *request;
  16
  17         smx_host_t dhost;
  18
  19         smx_action_t action;
  20
  21         smpi_received_message_t *message;
  22
  23         int drank;
  24
  25         smx_process_t receiver_process;
  26
  27         self  = SIMIX_process_self();
  28         shost = SIMIX_host_self();
  29         rank  = smpi_mpi_comm_rank(smpi_mpi_global->mpi_comm_world, shost);
  30
  31         // make sure root is done before own initialization
  32         SIMIX_mutex_lock(smpi_global->start_stop_mutex);
  33         if (!smpi_global->root_ready) {
  34                 SIMIX_cond_wait(smpi_global->start_stop_cond, smpi_global->start_stop_mutex);
  35         }
  36         SIMIX_mutex_unlock(smpi_global->start_stop_mutex);
  37
  38         request_queue       = smpi_global->pending_send_request_queues[rank];
  39         request_queue_mutex = smpi_global->pending_send_request_queues_mutexes[rank];
  40         size                = smpi_mpi_comm_size(smpi_mpi_global->mpi_comm_world);
  41
  42         smpi_global->sender_processes[rank] = self;
  43
  44         // wait for all nodes to signal initializatin complete
  45         SIMIX_mutex_lock(smpi_global->start_stop_mutex);
  46         smpi_global->ready_process_count++;
  47         if (smpi_global->ready_process_count < 3 * size) {
  48                 SIMIX_cond_wait(smpi_global->start_stop_cond, smpi_global->start_stop_mutex);
  49         } else {
  50                 SIMIX_cond_broadcast(smpi_global->start_stop_cond);
  51         }
  52         SIMIX_mutex_unlock(smpi_global->start_stop_mutex);
  53
  54         do {
  55
  56                 SIMIX_mutex_lock(request_queue_mutex);
  57                 request = xbt_fifo_shift(request_queue);
  58                 SIMIX_mutex_unlock(request_queue_mutex);
  59
  60                 if (NULL == request) {
  61                         SIMIX_process_suspend(self);
  62                 } else {
  63
  64                         message       = xbt_mallocator_get(smpi_global->message_mallocator);
  65
  66                         SIMIX_mutex_lock(request->simdata->mutex);
  67
  68                         message->comm = request->comm;
  69                         message->src  = request->src;
  70                         message->dst  = request->dst;
  71                         message->tag  = request->tag;
  72                         message->buf  = xbt_malloc(request->datatype->size * request->count);
  73                         memcpy(message->buf, request->buf, request->datatype->size * request->count);
  74
  75                         dhost = request->comm->simdata->hosts[request->dst];
  76                         drank = smpi_mpi_comm_rank(smpi_mpi_global->mpi_comm_world, dhost);
  77
  78                         SIMIX_mutex_lock(smpi_global->received_message_queues_mutexes[drank]);
  79                         xbt_fifo_push(smpi_global->received_message_queues[drank], message);
  80                         SIMIX_mutex_unlock(smpi_global->received_message_queues_mutexes[drank]);
  81
  82                         request->completed = 1;
  83
  84                         action = SIMIX_action_communicate(shost, dhost, "communicate", request->datatype->size * request->count * 1.0, -1.0);
  85
  86                         SIMIX_register_action_to_condition(action, request->simdata->cond);
  87                         SIMIX_cond_wait(request->simdata->cond, request->simdata->mutex);
  88                         SIMIX_unregister_action_to_condition(action, request->simdata->cond);
  89
  90                         SIMIX_mutex_unlock(request->simdata->mutex);
  91
  92                         // wake up receiver if necessary
  93                         receiver_process = smpi_global->receiver_processes[drank];
  94                         if (SIMIX_process_is_suspended(receiver_process)) {
  95                                 SIMIX_process_resume(receiver_process);
  96                         }
  97
  98                 }
  99
 100                 SIMIX_mutex_lock(smpi_global->running_hosts_count_mutex);
 101                 running_hosts_count = smpi_global->running_hosts_count;
 102                 SIMIX_mutex_unlock(smpi_global->running_hosts_count_mutex);
 103
 104         } while (0 < running_hosts_count);
 105
 106         SIMIX_mutex_lock(smpi_global->start_stop_mutex);
 107         smpi_global->ready_process_count--;
 108         if (smpi_global->ready_process_count == 0) {
 109                 SIMIX_cond_broadcast(smpi_global->start_stop_cond);
 110         } else if (smpi_global->ready_process_count < 0) {
 111                 // FIXME: can't happen! abort!
 112         }
 113         SIMIX_mutex_unlock(smpi_global->start_stop_mutex);
 114
 115         return 0;
 116 }
 117