+/* Copyright (c) 2004-2014. The SimGrid Team.
+ * All rights reserved. */
+
+/* This program is free software; you can redistribute it and/or modify it
+ * under the terms of the license (GNU LGPL) which comes with this package. */
+
+#include "private.h"
+#include "xbt/sysdep.h"
+#include "xbt/log.h"
+#include "xbt/dict.h"
+
+static xbt_dict_t smpi_instances = NULL;
+extern int process_count;
+extern int* index_to_process_data;
+
+typedef struct s_smpi_mpi_instance{
+ const char* name;
+ int size;
+ int present_processes;
+ int index;
+ MPI_Comm comm_world;
+} s_smpi_mpi_instance_t;
+
+
+/** \ingroup smpi_simulation
+ * \brief Registers a running instance of a MPI program.
+ *
+ * FIXME : remove MSG from the loop at some point.
+ * \param name the reference name of the function.
+ * \param code the main mpi function (must have the same prototype than the main function of any C program: int ..(int argc, char *argv[]))
+ * \param num_processes the size of the instance we want to deploy
+ */
+void SMPI_app_instance_register(const char *name, xbt_main_func_t code, int num_processes)
+{
+ SIMIX_function_register(name, code);
+
+ s_smpi_mpi_instance_t* instance =
+ (s_smpi_mpi_instance_t*)xbt_malloc(sizeof(s_smpi_mpi_instance_t));
+
+ instance->name = name;
+ instance->size = num_processes;
+ instance->present_processes = 0;
+ instance->index = process_count;
+ instance->comm_world = MPI_COMM_NULL;
+ process_count+=num_processes;
+
+ if(!smpi_instances){
+ smpi_instances=xbt_dict_new_homogeneous(xbt_free);
+ }
+
+ xbt_dict_set(smpi_instances, name, (void*)instance, NULL);
+ return;
+}
+
+
+//get the index of the process in the process_data array
+MPI_Comm* smpi_deployment_register_process(const char* instance_id, int rank, int index){
+
+ if(!smpi_instances){//no instance registered, we probably used smpirun.
+ index_to_process_data[index]=index;
+ return NULL;
+ }
+
+ s_smpi_mpi_instance_t* instance = xbt_dict_get_or_null(smpi_instances, instance_id);
+ if (!instance)
+ xbt_die("Error, unknown instance %s", instance_id);
+
+ if(instance->comm_world == MPI_COMM_NULL){
+ MPI_Group group = smpi_group_new(instance->size);
+ instance->comm_world = smpi_comm_new(group, NULL);
+ }
+ instance->present_processes++;
+ index_to_process_data[index]=instance->index+rank;
+ smpi_group_set_mapping(smpi_comm_group(instance->comm_world), index, rank);
+ return & instance->comm_world;
+}
