X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/d70128f70514554704db4f73ce52cde5b8380b5e..77b1286ea2fbc5c4dd502da81961599504f01000:/src/smpi/smpi_pmpi.cpp

diff --git a/src/smpi/smpi_pmpi.cpp b/src/smpi/smpi_pmpi.cpp
index 57075dfe69..5b41eb6c8d 100644
--- a/src/smpi/smpi_pmpi.cpp
+++ b/src/smpi/smpi_pmpi.cpp
@@ -4,10 +4,8 @@
  * under the terms of the license (GNU LGPL) which comes with this package. */
 
 #include <simgrid/s4u/host.hpp>
-#include <xbt/ex.hpp>
 
 #include "private.h"
-#include "smpi_mpi_dt_private.h"
 
 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_pmpi, smpi, "Logging specific to SMPI (pmpi)");
 
@@ -30,9 +28,9 @@ int PMPI_Init(int *argc, char ***argv)
   int already_init;
   MPI_Initialized(&already_init);
   if(already_init == 0){
-    smpi_process_init(argc, argv);
-    smpi_process_mark_as_initialized();
-    int rank = smpi_process_index();
+    simgrid::smpi::Process::init(argc, argv);
+    smpi_process()->mark_as_initialized();
+    int rank = smpi_process()->index();
     TRACE_smpi_init(rank);
     TRACE_smpi_computing_init(rank);
     instr_extra_data extra = xbt_new0(s_instr_extra_data_t,1);
@@ -50,22 +48,22 @@ int PMPI_Init(int *argc, char ***argv)
 int PMPI_Finalize()
 {
   smpi_bench_end();
-  int rank = smpi_process_index();
+  int rank = smpi_process()->index();
   instr_extra_data extra = xbt_new0(s_instr_extra_data_t,1);
   extra->type = TRACING_FINALIZE;
   TRACE_smpi_collective_in(rank, -1, __FUNCTION__, extra);
 
-  smpi_process_finalize();
+  smpi_process()->finalize();
 
   TRACE_smpi_collective_out(rank, -1, __FUNCTION__);
-  TRACE_smpi_finalize(smpi_process_index());
-  smpi_process_destroy();
+  TRACE_smpi_finalize(smpi_process()->index());
+  smpi_process()->destroy();
   return MPI_SUCCESS;
 }
 
 int PMPI_Finalized(int* flag)
 {
-  *flag=smpi_process_finalized();
+  *flag=smpi_process()!=nullptr ? smpi_process()->finalized() : 0;
   return MPI_SUCCESS;
 }
 
@@ -107,7 +105,7 @@ int PMPI_Is_thread_main(int *flag)
   if (flag == nullptr) {
     return MPI_ERR_ARG;
   } else {
-    *flag = smpi_process_index() == 0;
+    *flag = smpi_process()->index() == 0;
     return MPI_SUCCESS;
   }
 }
@@ -115,7 +113,7 @@ int PMPI_Is_thread_main(int *flag)
 int PMPI_Abort(MPI_Comm comm, int errorcode)
 {
   smpi_bench_end();
-  smpi_process_destroy();
+  smpi_process()->destroy();
   // FIXME: should kill all processes in comm instead
   simcall_process_kill(SIMIX_process_self());
   return MPI_SUCCESS;
@@ -153,7 +151,7 @@ int PMPI_Type_free(MPI_Datatype * datatype)
   if (*datatype == MPI_DATATYPE_NULL) {
     return MPI_ERR_ARG;
   } else {
-    smpi_datatype_unuse(*datatype);
+    simgrid::smpi::Datatype::unref(*datatype);
     return MPI_SUCCESS;
   }
 }
@@ -165,7 +163,7 @@ int PMPI_Type_size(MPI_Datatype datatype, int *size)
   } else if (size == nullptr) {
     return MPI_ERR_ARG;
   } else {
-    *size = static_cast<int>(smpi_datatype_size(datatype));
+    *size = static_cast<int>(datatype->size());
     return MPI_SUCCESS;
   }
 }
@@ -177,7 +175,7 @@ int PMPI_Type_size_x(MPI_Datatype datatype, MPI_Count *size)
   } else if (size == nullptr) {
     return MPI_ERR_ARG;
   } else {
-    *size = static_cast<MPI_Count>(smpi_datatype_size(datatype));
+    *size = static_cast<MPI_Count>(datatype->size());
     return MPI_SUCCESS;
   }
 }
@@ -189,7 +187,7 @@ int PMPI_Type_get_extent(MPI_Datatype datatype, MPI_Aint * lb, MPI_Aint * extent
   } else if (lb == nullptr || extent == nullptr) {
     return MPI_ERR_ARG;
   } else {
-    return smpi_datatype_extent(datatype, lb, extent);
+    return datatype->extent(lb, extent);
   }
 }
 
@@ -205,7 +203,7 @@ int PMPI_Type_extent(MPI_Datatype datatype, MPI_Aint * extent)
   } else if (extent == nullptr) {
     return MPI_ERR_ARG;
   } else {
-    *extent = smpi_datatype_get_extent(datatype);
+    *extent = datatype->get_extent();
     return MPI_SUCCESS;
   }
 }
@@ -217,7 +215,7 @@ int PMPI_Type_lb(MPI_Datatype datatype, MPI_Aint * disp)
   } else if (disp == nullptr) {
     return MPI_ERR_ARG;
   } else {
-    *disp = smpi_datatype_lb(datatype);
+    *disp = datatype->lb();
     return MPI_SUCCESS;
   }
 }
@@ -229,17 +227,24 @@ int PMPI_Type_ub(MPI_Datatype datatype, MPI_Aint * disp)
   } else if (disp == nullptr) {
     return MPI_ERR_ARG;
   } else {
-    *disp = smpi_datatype_ub(datatype);
+    *disp = datatype->ub();
     return MPI_SUCCESS;
   }
 }
 
 int PMPI_Type_dup(MPI_Datatype datatype, MPI_Datatype *newtype){
+  int retval = MPI_SUCCESS;
   if (datatype == MPI_DATATYPE_NULL) {
-    return MPI_ERR_TYPE;
+    retval=MPI_ERR_TYPE;
   } else {
-    return smpi_datatype_dup(datatype, newtype);
+    *newtype = new simgrid::smpi::Datatype(datatype, &retval);
+    //error when duplicating, free the new datatype
+    if(retval!=MPI_SUCCESS){
+      simgrid::smpi::Datatype::unref(*newtype);
+      *newtype = MPI_DATATYPE_NULL;
+    }
   }
+  return retval;
 }
 
 int PMPI_Op_create(MPI_User_function * function, int commute, MPI_Op * op)
@@ -247,7 +252,7 @@ int PMPI_Op_create(MPI_User_function * function, int commute, MPI_Op * op)
   if (function == nullptr || op == nullptr) {
     return MPI_ERR_ARG;
   } else {
-    *op = smpi_op_new(function, (commute!=0));
+    *op = new simgrid::smpi::Op(function, (commute!=0));
     return MPI_SUCCESS;
   }
 }
@@ -259,7 +264,7 @@ int PMPI_Op_free(MPI_Op * op)
   } else if (*op == MPI_OP_NULL) {
     return MPI_ERR_OP;
   } else {
-    smpi_op_destroy(*op);
+    delete (*op);
     *op = MPI_OP_NULL;
     return MPI_SUCCESS;
   }
@@ -270,7 +275,8 @@ int PMPI_Group_free(MPI_Group * group)
   if (group == nullptr) {
     return MPI_ERR_ARG;
   } else {
-    (*group)->destroy();
+    if(*group != MPI_COMM_WORLD->group() && *group != MPI_GROUP_EMPTY)
+      simgrid::smpi::Group::unref(*group);
     *group = MPI_GROUP_NULL;
     return MPI_SUCCESS;
   }
@@ -295,7 +301,7 @@ int PMPI_Group_rank(MPI_Group group, int *rank)
   } else if (rank == nullptr) {
     return MPI_ERR_ARG;
   } else {
-    *rank = group->rank(smpi_process_index());
+    *rank = group->rank(smpi_process()->index());
     return MPI_SUCCESS;
   }
 }
@@ -386,7 +392,7 @@ int PMPI_Group_excl(MPI_Group group, int n, int *ranks, MPI_Group * newgroup)
       *newgroup = group;
       if (group != MPI_COMM_WORLD->group()
                 && group != MPI_COMM_SELF->group() && group != MPI_GROUP_EMPTY)
-      group->use();
+      group->ref();
       return MPI_SUCCESS;
     } else if (n == group->size()) {
       *newgroup = MPI_GROUP_EMPTY;
@@ -424,7 +430,7 @@ int PMPI_Group_range_excl(MPI_Group group, int n, int ranges[][3], MPI_Group * n
       *newgroup = group;
       if (group != MPI_COMM_WORLD->group() && group != MPI_COMM_SELF->group() &&
           group != MPI_GROUP_EMPTY)
-        group->use();
+        group->ref();
       return MPI_SUCCESS;
     } else {
       return group->range_excl(n,ranges,newgroup);
@@ -477,7 +483,7 @@ int PMPI_Comm_group(MPI_Comm comm, MPI_Group * group)
   } else {
     *group = comm->group();
     if (*group != MPI_COMM_WORLD->group() && *group != MPI_GROUP_NULL && *group != MPI_GROUP_EMPTY)
-      (*group)->use();
+      (*group)->ref();
     return MPI_SUCCESS;
   }
 }
@@ -520,12 +526,12 @@ int PMPI_Comm_create(MPI_Comm comm, MPI_Group group, MPI_Comm * newcomm)
     return MPI_ERR_GROUP;
   } else if (newcomm == nullptr) {
     return MPI_ERR_ARG;
-  } else if(group->rank(smpi_process_index())==MPI_UNDEFINED){
+  } else if(group->rank(smpi_process()->index())==MPI_UNDEFINED){
     *newcomm= MPI_COMM_NULL;
     return MPI_SUCCESS;
   }else{
-    group->use();
-    *newcomm = new simgrid::SMPI::Comm(group, nullptr);
+    group->ref();
+    *newcomm = new simgrid::smpi::Comm(group, nullptr);
     return MPI_SUCCESS;
   }
 }
@@ -537,7 +543,7 @@ int PMPI_Comm_free(MPI_Comm * comm)
   } else if (*comm == MPI_COMM_NULL) {
     return MPI_ERR_COMM;
   } else {
-    (*comm)->destroy();
+    simgrid::smpi::Comm::destroy(*comm);
     *comm = MPI_COMM_NULL;
     return MPI_SUCCESS;
   }
@@ -551,7 +557,7 @@ int PMPI_Comm_disconnect(MPI_Comm * comm)
   } else if (*comm == MPI_COMM_NULL) {
     return MPI_ERR_COMM;
   } else {
-    (*comm)->destroy();
+    simgrid::smpi::Comm::destroy(*comm);
     *comm = MPI_COMM_NULL;
     return MPI_SUCCESS;
   }
@@ -601,12 +607,12 @@ int PMPI_Send_init(void *buf, int count, MPI_Datatype datatype, int dst, int tag
       retval = MPI_ERR_ARG;
   } else if (comm == MPI_COMM_NULL) {
       retval = MPI_ERR_COMM;
-  } else if (!is_datatype_valid(datatype)) {
+  } else if (!datatype->is_valid()) {
       retval = MPI_ERR_TYPE;
   } else if (dst == MPI_PROC_NULL) {
       retval = MPI_SUCCESS;
   } else {
-      *request = smpi_mpi_send_init(buf, count, datatype, dst, tag, comm);
+      *request = simgrid::smpi::Request::send_init(buf, count, datatype, dst, tag, comm);
       retval = MPI_SUCCESS;
   }
   smpi_bench_begin();
@@ -624,12 +630,12 @@ int PMPI_Recv_init(void *buf, int count, MPI_Datatype datatype, int src, int tag
     retval = MPI_ERR_ARG;
   } else if (comm == MPI_COMM_NULL) {
     retval = MPI_ERR_COMM;
-  } else if (!is_datatype_valid(datatype)) {
+  } else if (!datatype->is_valid()) {
       retval = MPI_ERR_TYPE;
   } else if (src == MPI_PROC_NULL) {
     retval = MPI_SUCCESS;
   } else {
-    *request = smpi_mpi_recv_init(buf, count, datatype, src, tag, comm);
+    *request = simgrid::smpi::Request::recv_init(buf, count, datatype, src, tag, comm);
     retval = MPI_SUCCESS;
   }
   smpi_bench_begin();
@@ -647,12 +653,12 @@ int PMPI_Ssend_init(void* buf, int count, MPI_Datatype datatype, int dst, int ta
     retval = MPI_ERR_ARG;
   } else if (comm == MPI_COMM_NULL) {
     retval = MPI_ERR_COMM;
-  } else if (!is_datatype_valid(datatype)) {
+  } else if (!datatype->is_valid()) {
       retval = MPI_ERR_TYPE;
   } else if (dst == MPI_PROC_NULL) {
     retval = MPI_SUCCESS;
   } else {
-    *request = smpi_mpi_ssend_init(buf, count, datatype, dst, tag, comm);
+    *request = simgrid::smpi::Request::ssend_init(buf, count, datatype, dst, tag, comm);
     retval = MPI_SUCCESS;
   }
   smpi_bench_begin();
@@ -669,7 +675,7 @@ int PMPI_Start(MPI_Request * request)
   if (request == nullptr || *request == MPI_REQUEST_NULL) {
     retval = MPI_ERR_REQUEST;
   } else {
-    smpi_mpi_start(*request);
+    (*request)->start();
     retval = MPI_SUCCESS;
   }
   smpi_bench_begin();
@@ -690,7 +696,7 @@ int PMPI_Startall(int count, MPI_Request * requests)
       }
     }
     if(retval != MPI_ERR_REQUEST) {
-      smpi_mpi_startall(count, requests);
+      simgrid::smpi::Request::startall(count, requests);
     }
   }
   smpi_bench_begin();
@@ -705,7 +711,7 @@ int PMPI_Request_free(MPI_Request * request)
   if (*request == MPI_REQUEST_NULL) {
     retval = MPI_ERR_ARG;
   } else {
-    smpi_mpi_request_free(request);
+    simgrid::smpi::Request::unref(request);
     retval = MPI_SUCCESS;
   }
   smpi_bench_begin();
@@ -729,13 +735,13 @@ int PMPI_Irecv(void *buf, int count, MPI_Datatype datatype, int src, int tag, MP
     retval = MPI_ERR_RANK;
   } else if ((count < 0) || (buf==nullptr && count > 0)) {
     retval = MPI_ERR_COUNT;
-  } else if (!is_datatype_valid(datatype)) {
+  } else if (!datatype->is_valid()) {
       retval = MPI_ERR_TYPE;
   } else if(tag<0 && tag !=  MPI_ANY_TAG){
     retval = MPI_ERR_TAG;
   } else {
 
-    int rank = comm != MPI_COMM_NULL ? smpi_process_index() : -1;
+    int rank = comm != MPI_COMM_NULL ? smpi_process()->index() : -1;
     int src_traced = comm->group()->index(src);
 
     instr_extra_data extra = xbt_new0(s_instr_extra_data_t,1);
@@ -746,15 +752,14 @@ int PMPI_Irecv(void *buf, int count, MPI_Datatype datatype, int src, int tag, MP
     extra->datatype1 = encode_datatype(datatype, &known);
     int dt_size_send = 1;
     if(known==0)
-      dt_size_send = smpi_datatype_size(datatype);
+      dt_size_send = datatype->size();
     extra->send_size = count*dt_size_send;
     TRACE_smpi_ptp_in(rank, src_traced, rank, __FUNCTION__, extra);
 
-    *request = smpi_mpi_irecv(buf, count, datatype, src, tag, comm);
+    *request = simgrid::smpi::Request::irecv(buf, count, datatype, src, tag, comm);
     retval = MPI_SUCCESS;
 
     TRACE_smpi_ptp_out(rank, src_traced, rank, __FUNCTION__);
-    (*request)->recv = 1;
   }
 
   smpi_bench_begin();
@@ -780,12 +785,12 @@ int PMPI_Isend(void *buf, int count, MPI_Datatype datatype, int dst, int tag, MP
     retval = MPI_ERR_RANK;
   } else if ((count < 0) || (buf==nullptr && count > 0)) {
     retval = MPI_ERR_COUNT;
-  } else if (!is_datatype_valid(datatype)) {
+  } else if (!datatype->is_valid()) {
       retval = MPI_ERR_TYPE;
   } else if(tag<0 && tag !=  MPI_ANY_TAG){
     retval = MPI_ERR_TAG;
   } else {
-    int rank = comm != MPI_COMM_NULL ? smpi_process_index() : -1;
+    int rank = comm != MPI_COMM_NULL ? smpi_process()->index() : -1;
     int dst_traced = comm->group()->index(dst);
     instr_extra_data extra = xbt_new0(s_instr_extra_data_t,1);
     extra->type = TRACING_ISEND;
@@ -795,16 +800,15 @@ int PMPI_Isend(void *buf, int count, MPI_Datatype datatype, int dst, int tag, MP
     extra->datatype1 = encode_datatype(datatype, &known);
     int dt_size_send = 1;
     if(known==0)
-      dt_size_send = smpi_datatype_size(datatype);
+      dt_size_send = datatype->size();
     extra->send_size = count*dt_size_send;
     TRACE_smpi_ptp_in(rank, rank, dst_traced, __FUNCTION__, extra);
-    TRACE_smpi_send(rank, rank, dst_traced, tag, count*smpi_datatype_size(datatype));
+    TRACE_smpi_send(rank, rank, dst_traced, tag, count*datatype->size());
 
-    *request = smpi_mpi_isend(buf, count, datatype, dst, tag, comm);
+    *request = simgrid::smpi::Request::isend(buf, count, datatype, dst, tag, comm);
     retval = MPI_SUCCESS;
 
     TRACE_smpi_ptp_out(rank, rank, dst_traced, __FUNCTION__);
-    (*request)->send = 1;
   }
 
   smpi_bench_begin();
@@ -829,12 +833,12 @@ int PMPI_Issend(void* buf, int count, MPI_Datatype datatype, int dst, int tag, M
     retval = MPI_ERR_RANK;
   } else if ((count < 0)|| (buf==nullptr && count > 0)) {
     retval = MPI_ERR_COUNT;
-  } else if (!is_datatype_valid(datatype)) {
+  } else if (!datatype->is_valid()) {
       retval = MPI_ERR_TYPE;
   } else if(tag<0 && tag !=  MPI_ANY_TAG){
     retval = MPI_ERR_TAG;
   } else {
-    int rank = comm != MPI_COMM_NULL ? smpi_process_index() : -1;
+    int rank = comm != MPI_COMM_NULL ? smpi_process()->index() : -1;
     int dst_traced = comm->group()->index(dst);
     instr_extra_data extra = xbt_new0(s_instr_extra_data_t,1);
     extra->type = TRACING_ISSEND;
@@ -844,16 +848,15 @@ int PMPI_Issend(void* buf, int count, MPI_Datatype datatype, int dst, int tag, M
     extra->datatype1 = encode_datatype(datatype, &known);
     int dt_size_send = 1;
     if(known==0)
-      dt_size_send = smpi_datatype_size(datatype);
+      dt_size_send = datatype->size();
     extra->send_size = count*dt_size_send;
     TRACE_smpi_ptp_in(rank, rank, dst_traced, __FUNCTION__, extra);
-    TRACE_smpi_send(rank, rank, dst_traced, tag, count*smpi_datatype_size(datatype));
+    TRACE_smpi_send(rank, rank, dst_traced, tag, count*datatype->size());
 
-    *request = smpi_mpi_issend(buf, count, datatype, dst, tag, comm);
+    *request = simgrid::smpi::Request::issend(buf, count, datatype, dst, tag, comm);
     retval = MPI_SUCCESS;
 
     TRACE_smpi_ptp_out(rank, rank, dst_traced, __FUNCTION__);
-    (*request)->send = 1;
   }
 
   smpi_bench_begin();
@@ -870,19 +873,19 @@ int PMPI_Recv(void *buf, int count, MPI_Datatype datatype, int src, int tag, MPI
   if (comm == MPI_COMM_NULL) {
     retval = MPI_ERR_COMM;
   } else if (src == MPI_PROC_NULL) {
-    smpi_empty_status(status);
+    simgrid::smpi::Status::empty(status);
     status->MPI_SOURCE = MPI_PROC_NULL;
     retval = MPI_SUCCESS;
   } else if (src!=MPI_ANY_SOURCE && (src >= comm->group()->size() || src <0)){
     retval = MPI_ERR_RANK;
   } else if ((count < 0) || (buf==nullptr && count > 0)) {
     retval = MPI_ERR_COUNT;
-  } else if (!is_datatype_valid(datatype)) {
+  } else if (!datatype->is_valid()) {
       retval = MPI_ERR_TYPE;
   } else if(tag<0 && tag !=  MPI_ANY_TAG){
     retval = MPI_ERR_TAG;
   } else {
-    int rank               = comm != MPI_COMM_NULL ? smpi_process_index() : -1;
+    int rank               = comm != MPI_COMM_NULL ? smpi_process()->index() : -1;
     int src_traced         = comm->group()->index(src);
     instr_extra_data extra = xbt_new0(s_instr_extra_data_t, 1);
     extra->type            = TRACING_RECV;
@@ -892,11 +895,11 @@ int PMPI_Recv(void *buf, int count, MPI_Datatype datatype, int src, int tag, MPI
     extra->datatype1       = encode_datatype(datatype, &known);
     int dt_size_send       = 1;
     if (known == 0)
-      dt_size_send   = smpi_datatype_size(datatype);
+      dt_size_send   = datatype->size();
     extra->send_size = count * dt_size_send;
     TRACE_smpi_ptp_in(rank, src_traced, rank, __FUNCTION__, extra);
 
-    smpi_mpi_recv(buf, count, datatype, src, tag, comm, status);
+    simgrid::smpi::Request::recv(buf, count, datatype, src, tag, comm, status);
     retval = MPI_SUCCESS;
 
     // the src may not have been known at the beginning of the recv (MPI_ANY_SOURCE)
@@ -927,12 +930,12 @@ int PMPI_Send(void *buf, int count, MPI_Datatype datatype, int dst, int tag, MPI
     retval = MPI_ERR_RANK;
   } else if ((count < 0) || (buf == nullptr && count > 0)) {
     retval = MPI_ERR_COUNT;
-  } else if (!is_datatype_valid(datatype)) {
+  } else if (!datatype->is_valid()) {
     retval = MPI_ERR_TYPE;
   } else if(tag < 0 && tag !=  MPI_ANY_TAG){
     retval = MPI_ERR_TAG;
   } else {
-    int rank               = comm != MPI_COMM_NULL ? smpi_process_index() : -1;
+    int rank               = comm != MPI_COMM_NULL ? smpi_process()->index() : -1;
     int dst_traced         = comm->group()->index(dst);
     instr_extra_data extra = xbt_new0(s_instr_extra_data_t,1);
     extra->type            = TRACING_SEND;
@@ -942,15 +945,15 @@ int PMPI_Send(void *buf, int count, MPI_Datatype datatype, int dst, int tag, MPI
     extra->datatype1       = encode_datatype(datatype, &known);
     int dt_size_send       = 1;
     if (known == 0) {
-      dt_size_send = smpi_datatype_size(datatype);
+      dt_size_send = datatype->size();
     }
     extra->send_size = count*dt_size_send;
     TRACE_smpi_ptp_in(rank, rank, dst_traced, __FUNCTION__, extra);
     if (!TRACE_smpi_view_internals()) {
-      TRACE_smpi_send(rank, rank, dst_traced, tag,count*smpi_datatype_size(datatype));
+      TRACE_smpi_send(rank, rank, dst_traced, tag,count*datatype->size());
     }
 
-    smpi_mpi_send(buf, count, datatype, dst, tag, comm);
+    simgrid::smpi::Request::send(buf, count, datatype, dst, tag, comm);
     retval = MPI_SUCCESS;
 
     TRACE_smpi_ptp_out(rank, rank, dst_traced, __FUNCTION__);
@@ -973,12 +976,12 @@ int PMPI_Ssend(void* buf, int count, MPI_Datatype datatype, int dst, int tag, MP
     retval = MPI_ERR_RANK;
   } else if ((count < 0) || (buf==nullptr && count > 0)) {
     retval = MPI_ERR_COUNT;
-  } else if (!is_datatype_valid(datatype)){
+  } else if (!datatype->is_valid()){
     retval = MPI_ERR_TYPE;
   } else if(tag<0 && tag !=  MPI_ANY_TAG){
     retval = MPI_ERR_TAG;
   } else {
-    int rank               = comm != MPI_COMM_NULL ? smpi_process_index() : -1;
+    int rank               = comm != MPI_COMM_NULL ? smpi_process()->index() : -1;
     int dst_traced         = comm->group()->index(dst);
     instr_extra_data extra = xbt_new0(s_instr_extra_data_t,1);
     extra->type            = TRACING_SSEND;
@@ -988,13 +991,13 @@ int PMPI_Ssend(void* buf, int count, MPI_Datatype datatype, int dst, int tag, MP
     extra->datatype1       = encode_datatype(datatype, &known);
     int dt_size_send       = 1;
     if(known == 0) {
-      dt_size_send = smpi_datatype_size(datatype);
+      dt_size_send = datatype->size();
     }
     extra->send_size = count*dt_size_send;
     TRACE_smpi_ptp_in(rank, rank, dst_traced, __FUNCTION__, extra);
-    TRACE_smpi_send(rank, rank, dst_traced, tag,count*smpi_datatype_size(datatype));
+    TRACE_smpi_send(rank, rank, dst_traced, tag,count*datatype->size());
   
-    smpi_mpi_ssend(buf, count, datatype, dst, tag, comm);
+    simgrid::smpi::Request::ssend(buf, count, datatype, dst, tag, comm);
     retval = MPI_SUCCESS;
   
     TRACE_smpi_ptp_out(rank, rank, dst_traced, __FUNCTION__);
@@ -1013,10 +1016,10 @@ int PMPI_Sendrecv(void *sendbuf, int sendcount, MPI_Datatype sendtype, int dst,
 
   if (comm == MPI_COMM_NULL) {
     retval = MPI_ERR_COMM;
-  } else if (!is_datatype_valid(sendtype) || !is_datatype_valid(recvtype)) {
+  } else if (!sendtype->is_valid() || !recvtype->is_valid()) {
     retval = MPI_ERR_TYPE;
   } else if (src == MPI_PROC_NULL || dst == MPI_PROC_NULL) {
-    smpi_empty_status(status);
+    simgrid::smpi::Status::empty(status);
     status->MPI_SOURCE = MPI_PROC_NULL;
     retval             = MPI_SUCCESS;
   }else if (dst >= comm->group()->size() || dst <0 ||
@@ -1029,7 +1032,7 @@ int PMPI_Sendrecv(void *sendbuf, int sendcount, MPI_Datatype sendtype, int dst,
     retval = MPI_ERR_TAG;
   } else {
 
-  int rank = comm != MPI_COMM_NULL ? smpi_process_index() : -1;
+  int rank = comm != MPI_COMM_NULL ? smpi_process()->index() : -1;
   int dst_traced = comm->group()->index(dst);
   int src_traced = comm->group()->index(src);
   instr_extra_data extra = xbt_new0(s_instr_extra_data_t,1);
@@ -1040,18 +1043,18 @@ int PMPI_Sendrecv(void *sendbuf, int sendcount, MPI_Datatype sendtype, int dst,
   extra->datatype1 = encode_datatype(sendtype, &known);
   int dt_size_send = 1;
   if(known==0)
-    dt_size_send = smpi_datatype_size(sendtype);
+    dt_size_send = sendtype->size();
   extra->send_size = sendcount*dt_size_send;
   extra->datatype2 = encode_datatype(recvtype, &known);
   int dt_size_recv = 1;
   if(known==0)
-    dt_size_recv = smpi_datatype_size(recvtype);
+    dt_size_recv = recvtype->size();
   extra->recv_size = recvcount*dt_size_recv;
 
   TRACE_smpi_ptp_in(rank, src_traced, dst_traced, __FUNCTION__, extra);
-  TRACE_smpi_send(rank, rank, dst_traced, sendtag,sendcount*smpi_datatype_size(sendtype));
+  TRACE_smpi_send(rank, rank, dst_traced, sendtag,sendcount*sendtype->size());
 
-  smpi_mpi_sendrecv(sendbuf, sendcount, sendtype, dst, sendtag, recvbuf, recvcount, recvtype, src, recvtag, comm,
+  simgrid::smpi::Request::sendrecv(sendbuf, sendcount, sendtype, dst, sendtag, recvbuf, recvcount, recvtype, src, recvtag, comm,
                     status);
   retval = MPI_SUCCESS;
 
@@ -1067,16 +1070,16 @@ int PMPI_Sendrecv_replace(void* buf, int count, MPI_Datatype datatype, int dst,
                           MPI_Comm comm, MPI_Status* status)
 {
   int retval = 0;
-  if (!is_datatype_valid(datatype)) {
+  if (!datatype->is_valid()) {
     return MPI_ERR_TYPE;
   } else if (count < 0) {
     return MPI_ERR_COUNT;
   } else {
-    int size = smpi_datatype_get_extent(datatype) * count;
+    int size = datatype->get_extent() * count;
     void* recvbuf = xbt_new0(char, size);
     retval = MPI_Sendrecv(buf, count, datatype, dst, sendtag, recvbuf, count, datatype, src, recvtag, comm, status);
     if(retval==MPI_SUCCESS){
-        smpi_datatype_copy(recvbuf, count, datatype, buf, count, datatype);
+        simgrid::smpi::Datatype::copy(recvbuf, count, datatype, buf, count, datatype);
     }
     xbt_free(recvbuf);
 
@@ -1092,16 +1095,16 @@ int PMPI_Test(MPI_Request * request, int *flag, MPI_Status * status)
     retval = MPI_ERR_ARG;
   } else if (*request == MPI_REQUEST_NULL) {
     *flag= true;
-    smpi_empty_status(status);
+    simgrid::smpi::Status::empty(status);
     retval = MPI_SUCCESS;
   } else {
-    int rank = ((*request)->comm != MPI_COMM_NULL) ? smpi_process_index() : -1;
+    int rank = ((*request)->comm() != MPI_COMM_NULL) ? smpi_process()->index() : -1;
 
     instr_extra_data extra = xbt_new0(s_instr_extra_data_t,1);
     extra->type = TRACING_TEST;
     TRACE_smpi_testing_in(rank, extra);
 
-    *flag = smpi_mpi_test(request, status);
+    *flag = simgrid::smpi::Request::test(request,status);
 
     TRACE_smpi_testing_out(rank);
     retval = MPI_SUCCESS;
@@ -1118,7 +1121,7 @@ int PMPI_Testany(int count, MPI_Request requests[], int *index, int *flag, MPI_S
   if (index == nullptr || flag == nullptr) {
     retval = MPI_ERR_ARG;
   } else {
-    *flag = smpi_mpi_testany(count, requests, index, status);
+    *flag = simgrid::smpi::Request::testany(count, requests, index, status);
     retval = MPI_SUCCESS;
   }
   smpi_bench_begin();
@@ -1133,7 +1136,7 @@ int PMPI_Testall(int count, MPI_Request* requests, int* flag, MPI_Status* status
   if (flag == nullptr) {
     retval = MPI_ERR_ARG;
   } else {
-    *flag = smpi_mpi_testall(count, requests, statuses);
+    *flag = simgrid::smpi::Request::testall(count, requests, statuses);
     retval = MPI_SUCCESS;
   }
   smpi_bench_begin();
@@ -1149,11 +1152,11 @@ int PMPI_Probe(int source, int tag, MPI_Comm comm, MPI_Status* status) {
   } else if (comm == MPI_COMM_NULL) {
     retval = MPI_ERR_COMM;
   } else if (source == MPI_PROC_NULL) {
-    smpi_empty_status(status);
+    simgrid::smpi::Status::empty(status);
     status->MPI_SOURCE = MPI_PROC_NULL;
     retval = MPI_SUCCESS;
   } else {
-    smpi_mpi_probe(source, tag, comm, status);
+    simgrid::smpi::Request::probe(source, tag, comm, status);
     retval = MPI_SUCCESS;
   }
   smpi_bench_begin();
@@ -1170,11 +1173,11 @@ int PMPI_Iprobe(int source, int tag, MPI_Comm comm, int* flag, MPI_Status* statu
     retval = MPI_ERR_COMM;
   } else if (source == MPI_PROC_NULL) {
     *flag=true;
-    smpi_empty_status(status);
+    simgrid::smpi::Status::empty(status);
     status->MPI_SOURCE = MPI_PROC_NULL;
     retval = MPI_SUCCESS;
   } else {
-    smpi_mpi_iprobe(source, tag, comm, flag, status);
+    simgrid::smpi::Request::iprobe(source, tag, comm, flag, status);
     retval = MPI_SUCCESS;
   }
   smpi_bench_begin();
@@ -1187,7 +1190,7 @@ int PMPI_Wait(MPI_Request * request, MPI_Status * status)
 
   smpi_bench_end();
 
-  smpi_empty_status(status);
+  simgrid::smpi::Status::empty(status);
 
   if (request == nullptr) {
     retval = MPI_ERR_ARG;
@@ -1195,18 +1198,18 @@ int PMPI_Wait(MPI_Request * request, MPI_Status * status)
     retval = MPI_SUCCESS;
   } else {
 
-    int rank = (request!=nullptr && (*request)->comm != MPI_COMM_NULL) ? smpi_process_index() : -1;
+    int rank = (request!=nullptr && (*request)->comm() != MPI_COMM_NULL) ? smpi_process()->index() : -1;
 
-    int src_traced = (*request)->src;
-    int dst_traced = (*request)->dst;
-    int tag_traced= (*request)->tag;
-    MPI_Comm comm = (*request)->comm;
-    int is_wait_for_receive = (*request)->recv;
+    int src_traced = (*request)->src();
+    int dst_traced = (*request)->dst();
+    int tag_traced= (*request)->tag();
+    MPI_Comm comm = (*request)->comm();
+    int is_wait_for_receive = ((*request)->flags() & RECV);
     instr_extra_data extra = xbt_new0(s_instr_extra_data_t,1);
     extra->type = TRACING_WAIT;
     TRACE_smpi_ptp_in(rank, src_traced, dst_traced, __FUNCTION__, extra);
 
-    smpi_mpi_wait(request, status);
+    simgrid::smpi::Request::wait(request, status);
     retval = MPI_SUCCESS;
 
     //the src may not have been known at the beginning of the recv (MPI_ANY_SOURCE)
@@ -1245,16 +1248,16 @@ int PMPI_Waitany(int count, MPI_Request requests[], int *index, MPI_Status * sta
   for (int i = 0; i < count; i++) {
     MPI_Request req = requests[i];      //already received requests are no longer valid
     if (req) {
-      savedvals[i]=(savedvalstype){req->src, req->dst, req->recv, req->tag, req->comm};
+      savedvals[i]=(savedvalstype){req->src(), req->dst(), (req->flags() & RECV), req->tag(), req->comm()};
     }
   }
-  int rank_traced = smpi_process_index();
+  int rank_traced = smpi_process()->index();
   instr_extra_data extra = xbt_new0(s_instr_extra_data_t,1);
   extra->type = TRACING_WAITANY;
   extra->send_size=count;
   TRACE_smpi_ptp_in(rank_traced, -1, -1, __FUNCTION__,extra);
 
-  *index = smpi_mpi_waitany(count, requests, status);
+  *index = simgrid::smpi::Request::waitany(count, requests, status);
 
   if(*index!=MPI_UNDEFINED){
     int src_traced = savedvals[*index].src;
@@ -1293,18 +1296,18 @@ int PMPI_Waitall(int count, MPI_Request requests[], MPI_Status status[])
   for (int i = 0; i < count; i++) {
     MPI_Request req = requests[i];
     if(req!=MPI_REQUEST_NULL){
-      savedvals[i]=(savedvalstype){req->src, req->dst, req->recv, req->tag, 1, req->comm};
+      savedvals[i]=(savedvalstype){req->src(), req->dst(), (req->flags() & RECV), req->tag(), 1, req->comm()};
     }else{
       savedvals[i].valid=0;
     }
   }
-  int rank_traced = smpi_process_index();
+  int rank_traced = smpi_process()->index();
   instr_extra_data extra = xbt_new0(s_instr_extra_data_t,1);
   extra->type = TRACING_WAITALL;
   extra->send_size=count;
   TRACE_smpi_ptp_in(rank_traced, -1, -1, __FUNCTION__,extra);
 
-  int retval = smpi_mpi_waitall(count, requests, status);
+  int retval = simgrid::smpi::Request::waitall(count, requests, status);
 
   for (int i = 0; i < count; i++) {
     if(savedvals[i].valid){
@@ -1335,7 +1338,7 @@ int PMPI_Waitsome(int incount, MPI_Request requests[], int *outcount, int *indic
   if (outcount == nullptr) {
     retval = MPI_ERR_ARG;
   } else {
-    *outcount = smpi_mpi_waitsome(incount, requests, indices, status);
+    *outcount = simgrid::smpi::Request::waitsome(incount, requests, indices, status);
     retval = MPI_SUCCESS;
   }
   smpi_bench_begin();
@@ -1350,7 +1353,7 @@ int PMPI_Testsome(int incount, MPI_Request requests[], int* outcount, int* indic
   if (outcount == nullptr) {
     retval = MPI_ERR_ARG;
   } else {
-    *outcount = smpi_mpi_testsome(incount, requests, indices, status);
+    *outcount = simgrid::smpi::Request::testsome(incount, requests, indices, status);
     retval    = MPI_SUCCESS;
   }
   smpi_bench_begin();
@@ -1366,10 +1369,10 @@ int PMPI_Bcast(void *buf, int count, MPI_Datatype datatype, int root, MPI_Comm c
 
   if (comm == MPI_COMM_NULL) {
     retval = MPI_ERR_COMM;
-  } else if (!is_datatype_valid(datatype)) {
+  } else if (!datatype->is_valid()) {
     retval = MPI_ERR_ARG;
   } else {
-    int rank        = comm != MPI_COMM_NULL ? smpi_process_index() : -1;
+    int rank        = comm != MPI_COMM_NULL ? smpi_process()->index() : -1;
     int root_traced = comm->group()->index(root);
 
     instr_extra_data extra = xbt_new0(s_instr_extra_data_t, 1);
@@ -1379,11 +1382,11 @@ int PMPI_Bcast(void *buf, int count, MPI_Datatype datatype, int root, MPI_Comm c
     extra->datatype1       = encode_datatype(datatype, &known);
     int dt_size_send       = 1;
     if (known == 0)
-      dt_size_send   = smpi_datatype_size(datatype);
+      dt_size_send   = datatype->size();
     extra->send_size = count * dt_size_send;
     TRACE_smpi_collective_in(rank, root_traced, __FUNCTION__, extra);
     if (comm->size() > 1)
-      mpi_coll_bcast_fun(buf, count, datatype, root, comm);
+      simgrid::smpi::Colls::bcast(buf, count, datatype, root, comm);
     retval = MPI_SUCCESS;
 
     TRACE_smpi_collective_out(rank, root_traced, __FUNCTION__);
@@ -1401,12 +1404,16 @@ int PMPI_Barrier(MPI_Comm comm)
   if (comm == MPI_COMM_NULL) {
     retval = MPI_ERR_COMM;
   } else {
-    int rank               = comm != MPI_COMM_NULL ? smpi_process_index() : -1;
+    int rank               = comm != MPI_COMM_NULL ? smpi_process()->index() : -1;
     instr_extra_data extra = xbt_new0(s_instr_extra_data_t, 1);
     extra->type            = TRACING_BARRIER;
     TRACE_smpi_collective_in(rank, -1, __FUNCTION__, extra);
 
-    mpi_coll_barrier_fun(comm);
+    simgrid::smpi::Colls::barrier(comm);
+
+    //Barrier can be used to synchronize RMA calls. Finish all requests from comm before.
+    comm->finish_rma_calls();
+
     retval = MPI_SUCCESS;
 
     TRACE_smpi_collective_out(rank, -1, __FUNCTION__);
@@ -1439,7 +1446,7 @@ int PMPI_Gather(void *sendbuf, int sendcount, MPI_Datatype sendtype,void *recvbu
       sendtmpcount=0;
       sendtmptype=recvtype;
     }
-    int rank               = comm != MPI_COMM_NULL ? smpi_process_index() : -1;
+    int rank               = comm != MPI_COMM_NULL ? smpi_process()->index() : -1;
     int root_traced        = comm->group()->index(root);
     instr_extra_data extra = xbt_new0(s_instr_extra_data_t, 1);
     extra->type            = TRACING_GATHER;
@@ -1448,17 +1455,17 @@ int PMPI_Gather(void *sendbuf, int sendcount, MPI_Datatype sendtype,void *recvbu
     extra->datatype1       = encode_datatype(sendtmptype, &known);
     int dt_size_send       = 1;
     if (known == 0)
-      dt_size_send   = smpi_datatype_size(sendtmptype);
+      dt_size_send   = sendtmptype->size();
     extra->send_size = sendtmpcount * dt_size_send;
     extra->datatype2 = encode_datatype(recvtype, &known);
     int dt_size_recv = 1;
     if ((comm->rank() == root) && known == 0)
-      dt_size_recv   = smpi_datatype_size(recvtype);
+      dt_size_recv   = recvtype->size();
     extra->recv_size = recvcount * dt_size_recv;
 
     TRACE_smpi_collective_in(rank, root_traced, __FUNCTION__, extra);
 
-    mpi_coll_gather_fun(sendtmpbuf, sendtmpcount, sendtmptype, recvbuf, recvcount, recvtype, root, comm);
+    simgrid::smpi::Colls::gather(sendtmpbuf, sendtmpcount, sendtmptype, recvbuf, recvcount, recvtype, root, comm);
 
     retval = MPI_SUCCESS;
     TRACE_smpi_collective_out(rank, root_traced, __FUNCTION__);
@@ -1493,7 +1500,7 @@ int PMPI_Gatherv(void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recv
       sendtmptype=recvtype;
     }
 
-    int rank               = comm != MPI_COMM_NULL ? smpi_process_index() : -1;
+    int rank               = comm != MPI_COMM_NULL ? smpi_process()->index() : -1;
     int root_traced        = comm->group()->index(root);
     int i                  = 0;
     int size               = comm->size();
@@ -1505,12 +1512,12 @@ int PMPI_Gatherv(void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recv
     extra->datatype1       = encode_datatype(sendtmptype, &known);
     int dt_size_send       = 1;
     if (known == 0)
-      dt_size_send   = smpi_datatype_size(sendtype);
+      dt_size_send   = sendtype->size();
     extra->send_size = sendtmpcount * dt_size_send;
     extra->datatype2 = encode_datatype(recvtype, &known);
     int dt_size_recv = 1;
     if (known == 0)
-      dt_size_recv = smpi_datatype_size(recvtype);
+      dt_size_recv = recvtype->size();
     if ((comm->rank() == root)) {
       extra->recvcounts = xbt_new(int, size);
       for (i                 = 0; i < size; i++) // copy data to avoid bad free
@@ -1518,8 +1525,7 @@ int PMPI_Gatherv(void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recv
     }
     TRACE_smpi_collective_in(rank, root_traced, __FUNCTION__, extra);
 
-    smpi_mpi_gatherv(sendtmpbuf, sendtmpcount, sendtmptype, recvbuf, recvcounts, displs, recvtype, root, comm);
-    retval = MPI_SUCCESS;
+    retval = simgrid::smpi::Colls::gatherv(sendtmpbuf, sendtmpcount, sendtmptype, recvbuf, recvcounts, displs, recvtype, root, comm);
     TRACE_smpi_collective_out(rank, root_traced, __FUNCTION__);
   }
 
@@ -1544,28 +1550,28 @@ int PMPI_Allgather(void *sendbuf, int sendcount, MPI_Datatype sendtype,
     retval = MPI_ERR_COUNT;
   } else {
     if(sendbuf == MPI_IN_PLACE) {
-      sendbuf=static_cast<char*>(recvbuf)+smpi_datatype_get_extent(recvtype)*recvcount*comm->rank();
+      sendbuf=static_cast<char*>(recvbuf)+recvtype->get_extent()*recvcount*comm->rank();
       sendcount=recvcount;
       sendtype=recvtype;
     }
-    int rank               = comm != MPI_COMM_NULL ? smpi_process_index() : -1;
+    int rank               = comm != MPI_COMM_NULL ? smpi_process()->index() : -1;
     instr_extra_data extra = xbt_new0(s_instr_extra_data_t, 1);
     extra->type            = TRACING_ALLGATHER;
     int known              = 0;
     extra->datatype1       = encode_datatype(sendtype, &known);
     int dt_size_send       = 1;
     if (known == 0)
-      dt_size_send   = smpi_datatype_size(sendtype);
+      dt_size_send   = sendtype->size();
     extra->send_size = sendcount * dt_size_send;
     extra->datatype2 = encode_datatype(recvtype, &known);
     int dt_size_recv = 1;
     if (known == 0)
-      dt_size_recv   = smpi_datatype_size(recvtype);
+      dt_size_recv   = recvtype->size();
     extra->recv_size = recvcount * dt_size_recv;
 
     TRACE_smpi_collective_in(rank, -1, __FUNCTION__, extra);
 
-    mpi_coll_allgather_fun(sendbuf, sendcount, sendtype, recvbuf, recvcount, recvtype, comm);
+    simgrid::smpi::Colls::allgather(sendbuf, sendcount, sendtype, recvbuf, recvcount, recvtype, comm);
     retval = MPI_SUCCESS;
     TRACE_smpi_collective_out(rank, -1, __FUNCTION__);
   }
@@ -1591,11 +1597,11 @@ int PMPI_Allgatherv(void *sendbuf, int sendcount, MPI_Datatype sendtype,
   } else {
 
     if(sendbuf == MPI_IN_PLACE) {
-      sendbuf=static_cast<char*>(recvbuf)+smpi_datatype_get_extent(recvtype)*displs[comm->rank()];
+      sendbuf=static_cast<char*>(recvbuf)+recvtype->get_extent()*displs[comm->rank()];
       sendcount=recvcounts[comm->rank()];
       sendtype=recvtype;
     }
-    int rank               = comm != MPI_COMM_NULL ? smpi_process_index() : -1;
+    int rank               = comm != MPI_COMM_NULL ? smpi_process()->index() : -1;
     int i                  = 0;
     int size               = comm->size();
     instr_extra_data extra = xbt_new0(s_instr_extra_data_t, 1);
@@ -1605,19 +1611,19 @@ int PMPI_Allgatherv(void *sendbuf, int sendcount, MPI_Datatype sendtype,
     extra->datatype1       = encode_datatype(sendtype, &known);
     int dt_size_send       = 1;
     if (known == 0)
-      dt_size_send   = smpi_datatype_size(sendtype);
+      dt_size_send   = sendtype->size();
     extra->send_size = sendcount * dt_size_send;
     extra->datatype2 = encode_datatype(recvtype, &known);
     int dt_size_recv = 1;
     if (known == 0)
-      dt_size_recv    = smpi_datatype_size(recvtype);
+      dt_size_recv    = recvtype->size();
     extra->recvcounts = xbt_new(int, size);
     for (i                 = 0; i < size; i++) // copy data to avoid bad free
       extra->recvcounts[i] = recvcounts[i] * dt_size_recv;
 
     TRACE_smpi_collective_in(rank, -1, __FUNCTION__, extra);
 
-    mpi_coll_allgatherv_fun(sendbuf, sendcount, sendtype, recvbuf, recvcounts, displs, recvtype, comm);
+    simgrid::smpi::Colls::allgatherv(sendbuf, sendcount, sendtype, recvbuf, recvcounts, displs, recvtype, comm);
     retval = MPI_SUCCESS;
     TRACE_smpi_collective_out(rank, -1, __FUNCTION__);
   }
@@ -1635,8 +1641,8 @@ int PMPI_Scatter(void *sendbuf, int sendcount, MPI_Datatype sendtype,
 
   if (comm == MPI_COMM_NULL) {
     retval = MPI_ERR_COMM;
-  } else if (((comm->rank() == root) && (!is_datatype_valid(sendtype))) ||
-             ((recvbuf != MPI_IN_PLACE) && (!is_datatype_valid(recvtype)))) {
+  } else if (((comm->rank() == root) && (!sendtype->is_valid())) ||
+             ((recvbuf != MPI_IN_PLACE) && (!recvtype->is_valid()))) {
     retval = MPI_ERR_TYPE;
   } else if ((sendbuf == recvbuf) ||
       ((comm->rank()==root) && sendcount>0 && (sendbuf == nullptr))){
@@ -1647,7 +1653,7 @@ int PMPI_Scatter(void *sendbuf, int sendcount, MPI_Datatype sendtype,
       recvtype  = sendtype;
       recvcount = sendcount;
     }
-    int rank               = comm != MPI_COMM_NULL ? smpi_process_index() : -1;
+    int rank               = comm != MPI_COMM_NULL ? smpi_process()->index() : -1;
     int root_traced        = comm->group()->index(root);
     instr_extra_data extra = xbt_new0(s_instr_extra_data_t, 1);
     extra->type            = TRACING_SCATTER;
@@ -1656,16 +1662,16 @@ int PMPI_Scatter(void *sendbuf, int sendcount, MPI_Datatype sendtype,
     extra->datatype1       = encode_datatype(sendtype, &known);
     int dt_size_send       = 1;
     if ((comm->rank() == root) && known == 0)
-      dt_size_send   = smpi_datatype_size(sendtype);
+      dt_size_send   = sendtype->size();
     extra->send_size = sendcount * dt_size_send;
     extra->datatype2 = encode_datatype(recvtype, &known);
     int dt_size_recv = 1;
     if (known == 0)
-      dt_size_recv   = smpi_datatype_size(recvtype);
+      dt_size_recv   = recvtype->size();
     extra->recv_size = recvcount * dt_size_recv;
     TRACE_smpi_collective_in(rank, root_traced, __FUNCTION__, extra);
 
-    mpi_coll_scatter_fun(sendbuf, sendcount, sendtype, recvbuf, recvcount, recvtype, root, comm);
+    simgrid::smpi::Colls::scatter(sendbuf, sendcount, sendtype, recvbuf, recvcount, recvtype, root, comm);
     retval = MPI_SUCCESS;
     TRACE_smpi_collective_out(rank, root_traced, __FUNCTION__);
   }
@@ -1693,7 +1699,7 @@ int PMPI_Scatterv(void *sendbuf, int *sendcounts, int *displs,
       recvtype  = sendtype;
       recvcount = sendcounts[comm->rank()];
     }
-    int rank               = comm != MPI_COMM_NULL ? smpi_process_index() : -1;
+    int rank               = comm != MPI_COMM_NULL ? smpi_process()->index() : -1;
     int root_traced        = comm->group()->index(root);
     int i                  = 0;
     int size               = comm->size();
@@ -1705,7 +1711,7 @@ int PMPI_Scatterv(void *sendbuf, int *sendcounts, int *displs,
     extra->datatype1       = encode_datatype(sendtype, &known);
     int dt_size_send       = 1;
     if (known == 0)
-      dt_size_send = smpi_datatype_size(sendtype);
+      dt_size_send = sendtype->size();
     if ((comm->rank() == root)) {
       extra->sendcounts = xbt_new(int, size);
       for (i                 = 0; i < size; i++) // copy data to avoid bad free
@@ -1714,13 +1720,12 @@ int PMPI_Scatterv(void *sendbuf, int *sendcounts, int *displs,
     extra->datatype2 = encode_datatype(recvtype, &known);
     int dt_size_recv = 1;
     if (known == 0)
-      dt_size_recv   = smpi_datatype_size(recvtype);
+      dt_size_recv   = recvtype->size();
     extra->recv_size = recvcount * dt_size_recv;
     TRACE_smpi_collective_in(rank, root_traced, __FUNCTION__, extra);
 
-    smpi_mpi_scatterv(sendbuf, sendcounts, displs, sendtype, recvbuf, recvcount, recvtype, root, comm);
+    retval = simgrid::smpi::Colls::scatterv(sendbuf, sendcounts, displs, sendtype, recvbuf, recvcount, recvtype, root, comm);
 
-    retval = MPI_SUCCESS;
     TRACE_smpi_collective_out(rank, root_traced, __FUNCTION__);
   }
 
@@ -1736,10 +1741,10 @@ int PMPI_Reduce(void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype,
 
   if (comm == MPI_COMM_NULL) {
     retval = MPI_ERR_COMM;
-  } else if (!is_datatype_valid(datatype) || op == MPI_OP_NULL) {
+  } else if (!datatype->is_valid() || op == MPI_OP_NULL) {
     retval = MPI_ERR_ARG;
   } else {
-    int rank               = comm != MPI_COMM_NULL ? smpi_process_index() : -1;
+    int rank               = comm != MPI_COMM_NULL ? smpi_process()->index() : -1;
     int root_traced        = comm->group()->index(root);
     instr_extra_data extra = xbt_new0(s_instr_extra_data_t, 1);
     extra->type            = TRACING_REDUCE;
@@ -1747,13 +1752,13 @@ int PMPI_Reduce(void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype,
     extra->datatype1       = encode_datatype(datatype, &known);
     int dt_size_send       = 1;
     if (known == 0)
-      dt_size_send   = smpi_datatype_size(datatype);
+      dt_size_send   = datatype->size();
     extra->send_size = count * dt_size_send;
     extra->root      = root_traced;
 
     TRACE_smpi_collective_in(rank, root_traced, __FUNCTION__, extra);
 
-    mpi_coll_reduce_fun(sendbuf, recvbuf, count, datatype, op, root, comm);
+    simgrid::smpi::Colls::reduce(sendbuf, recvbuf, count, datatype, op, root, comm);
 
     retval = MPI_SUCCESS;
     TRACE_smpi_collective_out(rank, root_traced, __FUNCTION__);
@@ -1767,10 +1772,10 @@ int PMPI_Reduce_local(void *inbuf, void *inoutbuf, int count, MPI_Datatype datat
   int retval = 0;
 
   smpi_bench_end();
-  if (!is_datatype_valid(datatype) || op == MPI_OP_NULL) {
+  if (!datatype->is_valid() || op == MPI_OP_NULL) {
     retval = MPI_ERR_ARG;
   } else {
-    smpi_op_apply(op, inbuf, inoutbuf, &count, &datatype);
+    op->apply(inbuf, inoutbuf, &count, datatype);
     retval = MPI_SUCCESS;
   }
   smpi_bench_begin();
@@ -1785,7 +1790,7 @@ int PMPI_Allreduce(void *sendbuf, void *recvbuf, int count, MPI_Datatype datatyp
 
   if (comm == MPI_COMM_NULL) {
     retval = MPI_ERR_COMM;
-  } else if (!is_datatype_valid(datatype)) {
+  } else if (!datatype->is_valid()) {
     retval = MPI_ERR_TYPE;
   } else if (op == MPI_OP_NULL) {
     retval = MPI_ERR_OP;
@@ -1793,22 +1798,22 @@ int PMPI_Allreduce(void *sendbuf, void *recvbuf, int count, MPI_Datatype datatyp
 
     char* sendtmpbuf = static_cast<char*>(sendbuf);
     if( sendbuf == MPI_IN_PLACE ) {
-      sendtmpbuf = static_cast<char*>(xbt_malloc(count*smpi_datatype_get_extent(datatype)));
-      smpi_datatype_copy(recvbuf, count, datatype,sendtmpbuf, count, datatype);
+      sendtmpbuf = static_cast<char*>(xbt_malloc(count*datatype->get_extent()));
+      simgrid::smpi::Datatype::copy(recvbuf, count, datatype,sendtmpbuf, count, datatype);
     }
-    int rank               = comm != MPI_COMM_NULL ? smpi_process_index() : -1;
+    int rank               = comm != MPI_COMM_NULL ? smpi_process()->index() : -1;
     instr_extra_data extra = xbt_new0(s_instr_extra_data_t, 1);
     extra->type            = TRACING_ALLREDUCE;
     int known              = 0;
     extra->datatype1       = encode_datatype(datatype, &known);
     int dt_size_send       = 1;
     if (known == 0)
-      dt_size_send   = smpi_datatype_size(datatype);
+      dt_size_send   = datatype->size();
     extra->send_size = count * dt_size_send;
 
     TRACE_smpi_collective_in(rank, -1, __FUNCTION__, extra);
 
-    mpi_coll_allreduce_fun(sendtmpbuf, recvbuf, count, datatype, op, comm);
+    simgrid::smpi::Colls::allreduce(sendtmpbuf, recvbuf, count, datatype, op, comm);
 
     if( sendbuf == MPI_IN_PLACE )
       xbt_free(sendtmpbuf);
@@ -1829,26 +1834,25 @@ int PMPI_Scan(void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype, MP
 
   if (comm == MPI_COMM_NULL) {
     retval = MPI_ERR_COMM;
-  } else if (!is_datatype_valid(datatype)) {
+  } else if (!datatype->is_valid()) {
     retval = MPI_ERR_TYPE;
   } else if (op == MPI_OP_NULL) {
     retval = MPI_ERR_OP;
   } else {
-    int rank               = comm != MPI_COMM_NULL ? smpi_process_index() : -1;
+    int rank               = comm != MPI_COMM_NULL ? smpi_process()->index() : -1;
     instr_extra_data extra = xbt_new0(s_instr_extra_data_t, 1);
     extra->type            = TRACING_SCAN;
     int known              = 0;
     extra->datatype1       = encode_datatype(datatype, &known);
     int dt_size_send       = 1;
     if (known == 0)
-      dt_size_send   = smpi_datatype_size(datatype);
+      dt_size_send   = datatype->size();
     extra->send_size = count * dt_size_send;
 
     TRACE_smpi_collective_in(rank, -1, __FUNCTION__, extra);
 
-    smpi_mpi_scan(sendbuf, recvbuf, count, datatype, op, comm);
+    retval = simgrid::smpi::Colls::scan(sendbuf, recvbuf, count, datatype, op, comm);
 
-    retval = MPI_SUCCESS;
     TRACE_smpi_collective_out(rank, -1, __FUNCTION__);
   }
 
@@ -1863,29 +1867,29 @@ int PMPI_Exscan(void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype,
 
   if (comm == MPI_COMM_NULL) {
     retval = MPI_ERR_COMM;
-  } else if (!is_datatype_valid(datatype)) {
+  } else if (!datatype->is_valid()) {
     retval = MPI_ERR_TYPE;
   } else if (op == MPI_OP_NULL) {
     retval = MPI_ERR_OP;
   } else {
-    int rank               = comm != MPI_COMM_NULL ? smpi_process_index() : -1;
+    int rank               = comm != MPI_COMM_NULL ? smpi_process()->index() : -1;
     instr_extra_data extra = xbt_new0(s_instr_extra_data_t, 1);
     extra->type            = TRACING_EXSCAN;
     int known              = 0;
     extra->datatype1       = encode_datatype(datatype, &known);
     int dt_size_send       = 1;
     if (known == 0)
-      dt_size_send   = smpi_datatype_size(datatype);
+      dt_size_send   = datatype->size();
     extra->send_size = count * dt_size_send;
     void* sendtmpbuf = sendbuf;
     if (sendbuf == MPI_IN_PLACE) {
-      sendtmpbuf = static_cast<void*>(xbt_malloc(count * smpi_datatype_size(datatype)));
-      memcpy(sendtmpbuf, recvbuf, count * smpi_datatype_size(datatype));
+      sendtmpbuf = static_cast<void*>(xbt_malloc(count * datatype->size()));
+      memcpy(sendtmpbuf, recvbuf, count * datatype->size());
     }
     TRACE_smpi_collective_in(rank, -1, __FUNCTION__, extra);
 
-    smpi_mpi_exscan(sendtmpbuf, recvbuf, count, datatype, op, comm);
-    retval = MPI_SUCCESS;
+    retval = simgrid::smpi::Colls::exscan(sendtmpbuf, recvbuf, count, datatype, op, comm);
+
     TRACE_smpi_collective_out(rank, -1, __FUNCTION__);
     if (sendbuf == MPI_IN_PLACE)
       xbt_free(sendtmpbuf);
@@ -1902,14 +1906,14 @@ int PMPI_Reduce_scatter(void *sendbuf, void *recvbuf, int *recvcounts, MPI_Datat
 
   if (comm == MPI_COMM_NULL) {
     retval = MPI_ERR_COMM;
-  } else if (!is_datatype_valid(datatype)) {
+  } else if (!datatype->is_valid()) {
     retval = MPI_ERR_TYPE;
   } else if (op == MPI_OP_NULL) {
     retval = MPI_ERR_OP;
   } else if (recvcounts == nullptr) {
     retval = MPI_ERR_ARG;
   } else {
-    int rank               = comm != MPI_COMM_NULL ? smpi_process_index() : -1;
+    int rank               = comm != MPI_COMM_NULL ? smpi_process()->index() : -1;
     int i                  = 0;
     int size               = comm->size();
     instr_extra_data extra = xbt_new0(s_instr_extra_data_t, 1);
@@ -1919,7 +1923,7 @@ int PMPI_Reduce_scatter(void *sendbuf, void *recvbuf, int *recvcounts, MPI_Datat
     extra->datatype1       = encode_datatype(datatype, &known);
     int dt_size_send       = 1;
     if (known == 0)
-      dt_size_send    = smpi_datatype_size(datatype);
+      dt_size_send    = datatype->size();
     extra->send_size  = 0;
     extra->recvcounts = xbt_new(int, size);
     int totalcount    = 0;
@@ -1929,13 +1933,13 @@ int PMPI_Reduce_scatter(void *sendbuf, void *recvbuf, int *recvcounts, MPI_Datat
     }
     void* sendtmpbuf = sendbuf;
     if (sendbuf == MPI_IN_PLACE) {
-      sendtmpbuf = static_cast<void*>(xbt_malloc(totalcount * smpi_datatype_size(datatype)));
-      memcpy(sendtmpbuf, recvbuf, totalcount * smpi_datatype_size(datatype));
+      sendtmpbuf = static_cast<void*>(xbt_malloc(totalcount * datatype->size()));
+      memcpy(sendtmpbuf, recvbuf, totalcount * datatype->size());
     }
 
     TRACE_smpi_collective_in(rank, -1, __FUNCTION__, extra);
 
-    mpi_coll_reduce_scatter_fun(sendtmpbuf, recvbuf, recvcounts, datatype, op, comm);
+    simgrid::smpi::Colls::reduce_scatter(sendtmpbuf, recvbuf, recvcounts, datatype, op, comm);
     retval = MPI_SUCCESS;
     TRACE_smpi_collective_out(rank, -1, __FUNCTION__);
 
@@ -1955,7 +1959,7 @@ int PMPI_Reduce_scatter_block(void *sendbuf, void *recvbuf, int recvcount,
 
   if (comm == MPI_COMM_NULL) {
     retval = MPI_ERR_COMM;
-  } else if (!is_datatype_valid(datatype)) {
+  } else if (!datatype->is_valid()) {
     retval = MPI_ERR_TYPE;
   } else if (op == MPI_OP_NULL) {
     retval = MPI_ERR_OP;
@@ -1964,7 +1968,7 @@ int PMPI_Reduce_scatter_block(void *sendbuf, void *recvbuf, int recvcount,
   } else {
     int count = comm->size();
 
-    int rank               = comm != MPI_COMM_NULL ? smpi_process_index() : -1;
+    int rank               = comm != MPI_COMM_NULL ? smpi_process()->index() : -1;
     instr_extra_data extra = xbt_new0(s_instr_extra_data_t, 1);
     extra->type            = TRACING_REDUCE_SCATTER;
     extra->num_processes   = count;
@@ -1972,15 +1976,15 @@ int PMPI_Reduce_scatter_block(void *sendbuf, void *recvbuf, int recvcount,
     extra->datatype1       = encode_datatype(datatype, &known);
     int dt_size_send       = 1;
     if (known == 0)
-      dt_size_send    = smpi_datatype_size(datatype);
+      dt_size_send    = datatype->size();
     extra->send_size  = 0;
     extra->recvcounts = xbt_new(int, count);
     for (int i             = 0; i < count; i++) // copy data to avoid bad free
       extra->recvcounts[i] = recvcount * dt_size_send;
     void* sendtmpbuf       = sendbuf;
     if (sendbuf == MPI_IN_PLACE) {
-      sendtmpbuf = static_cast<void*>(xbt_malloc(recvcount * count * smpi_datatype_size(datatype)));
-      memcpy(sendtmpbuf, recvbuf, recvcount * count * smpi_datatype_size(datatype));
+      sendtmpbuf = static_cast<void*>(xbt_malloc(recvcount * count * datatype->size()));
+      memcpy(sendtmpbuf, recvbuf, recvcount * count * datatype->size());
     }
 
     TRACE_smpi_collective_in(rank, -1, __FUNCTION__, extra);
@@ -1988,7 +1992,7 @@ int PMPI_Reduce_scatter_block(void *sendbuf, void *recvbuf, int recvcount,
     int* recvcounts = static_cast<int*>(xbt_malloc(count * sizeof(int)));
     for (int i      = 0; i < count; i++)
       recvcounts[i] = recvcount;
-    mpi_coll_reduce_scatter_fun(sendtmpbuf, recvbuf, recvcounts, datatype, op, comm);
+    simgrid::smpi::Colls::reduce_scatter(sendtmpbuf, recvbuf, recvcounts, datatype, op, comm);
     xbt_free(recvcounts);
     retval = MPI_SUCCESS;
 
@@ -2013,7 +2017,7 @@ int PMPI_Alltoall(void* sendbuf, int sendcount, MPI_Datatype sendtype, void* rec
   } else if ((sendbuf != MPI_IN_PLACE && sendtype == MPI_DATATYPE_NULL) || recvtype == MPI_DATATYPE_NULL) {
     retval = MPI_ERR_TYPE;
   } else {
-    int rank               = comm != MPI_COMM_NULL ? smpi_process_index() : -1;
+    int rank               = comm != MPI_COMM_NULL ? smpi_process()->index() : -1;
     instr_extra_data extra = xbt_new0(s_instr_extra_data_t, 1);
     extra->type            = TRACING_ALLTOALL;
 
@@ -2021,8 +2025,8 @@ int PMPI_Alltoall(void* sendbuf, int sendcount, MPI_Datatype sendtype, void* rec
     int sendtmpcount         = sendcount;
     MPI_Datatype sendtmptype = sendtype;
     if (sendbuf == MPI_IN_PLACE) {
-      sendtmpbuf = static_cast<void*>(xbt_malloc(recvcount * comm->size() * smpi_datatype_size(recvtype)));
-      memcpy(sendtmpbuf, recvbuf, recvcount * comm->size() * smpi_datatype_size(recvtype));
+      sendtmpbuf = static_cast<void*>(xbt_malloc(recvcount * comm->size() * recvtype->size()));
+      memcpy(sendtmpbuf, recvbuf, recvcount * comm->size() * recvtype->size());
       sendtmpcount = recvcount;
       sendtmptype  = recvtype;
     }
@@ -2030,18 +2034,18 @@ int PMPI_Alltoall(void* sendbuf, int sendcount, MPI_Datatype sendtype, void* rec
     int known        = 0;
     extra->datatype1 = encode_datatype(sendtmptype, &known);
     if (known == 0)
-      extra->send_size = sendtmpcount * smpi_datatype_size(sendtmptype);
+      extra->send_size = sendtmpcount * sendtmptype->size();
     else
       extra->send_size = sendtmpcount;
     extra->datatype2   = encode_datatype(recvtype, &known);
     if (known == 0)
-      extra->recv_size = recvcount * smpi_datatype_size(recvtype);
+      extra->recv_size = recvcount * recvtype->size();
     else
       extra->recv_size = recvcount;
 
     TRACE_smpi_collective_in(rank, -1, __FUNCTION__, extra);
 
-    retval = mpi_coll_alltoall_fun(sendtmpbuf, sendtmpcount, sendtmptype, recvbuf, recvcount, recvtype, comm);
+    retval = simgrid::smpi::Colls::alltoall(sendtmpbuf, sendtmpcount, sendtmptype, recvbuf, recvcount, recvtype, comm);
 
     TRACE_smpi_collective_out(rank, -1, __FUNCTION__);
 
@@ -2068,7 +2072,7 @@ int PMPI_Alltoallv(void* sendbuf, int* sendcounts, int* senddisps, MPI_Datatype
              recvdisps == nullptr) {
     retval = MPI_ERR_ARG;
   } else {
-    int rank               = comm != MPI_COMM_NULL ? smpi_process_index() : -1;
+    int rank               = comm != MPI_COMM_NULL ? smpi_process()->index() : -1;
     int i                  = 0;
     int size               = comm->size();
     instr_extra_data extra = xbt_new0(s_instr_extra_data_t, 1);
@@ -2080,7 +2084,7 @@ int PMPI_Alltoallv(void* sendbuf, int* sendcounts, int* senddisps, MPI_Datatype
     int known              = 0;
     int dt_size_recv       = 1;
     extra->datatype2       = encode_datatype(recvtype, &known);
-    dt_size_recv           = smpi_datatype_size(recvtype);
+    dt_size_recv           = recvtype->size();
 
     void* sendtmpbuf         = static_cast<char*>(sendbuf);
     int* sendtmpcounts       = sendcounts;
@@ -2106,7 +2110,7 @@ int PMPI_Alltoallv(void* sendbuf, int* sendcounts, int* senddisps, MPI_Datatype
 
     extra->datatype1 = encode_datatype(sendtmptype, &known);
     int dt_size_send = 1;
-    dt_size_send     = smpi_datatype_size(sendtmptype);
+    dt_size_send     = sendtmptype->size();
 
     for (i = 0; i < size; i++) { // copy data to avoid bad free
       extra->send_size += sendtmpcounts[i] * dt_size_send;
@@ -2114,7 +2118,7 @@ int PMPI_Alltoallv(void* sendbuf, int* sendcounts, int* senddisps, MPI_Datatype
     }
     extra->num_processes = size;
     TRACE_smpi_collective_in(rank, -1, __FUNCTION__, extra);
-    retval = mpi_coll_alltoallv_fun(sendtmpbuf, sendtmpcounts, sendtmpdisps, sendtmptype, recvbuf, recvcounts,
+    retval = simgrid::smpi::Colls::alltoallv(sendtmpbuf, sendtmpcounts, sendtmpdisps, sendtmptype, recvbuf, recvcounts,
                                     recvdisps, recvtype, comm);
     TRACE_smpi_collective_out(rank, -1, __FUNCTION__);
 
@@ -2144,17 +2148,17 @@ int PMPI_Get_count(MPI_Status * status, MPI_Datatype datatype, int *count)
 {
   if (status == nullptr || count == nullptr) {
     return MPI_ERR_ARG;
-  } else if (!is_datatype_valid(datatype)) {
+  } else if (!datatype->is_valid()) {
     return MPI_ERR_TYPE;
   } else {
-    size_t size = smpi_datatype_size(datatype);
+    size_t size = datatype->size();
     if (size == 0) {
       *count = 0;
       return MPI_SUCCESS;
     } else if (status->count % size != 0) {
       return MPI_UNDEFINED;
     } else {
-      *count = smpi_mpi_get_count(status, datatype);
+      *count = simgrid::smpi::Status::get_count(status, datatype);
       return MPI_SUCCESS;
     }
   }
@@ -2166,7 +2170,7 @@ int PMPI_Type_contiguous(int count, MPI_Datatype old_type, MPI_Datatype* new_typ
   } else if (count<0){
     return MPI_ERR_COUNT;
   } else {
-    return smpi_datatype_contiguous(count, old_type, new_type, 0);
+    return simgrid::smpi::Datatype::create_contiguous(count, old_type, 0, new_type);
   }
 }
 
@@ -2174,7 +2178,7 @@ int PMPI_Type_commit(MPI_Datatype* datatype) {
   if (datatype == nullptr || *datatype == MPI_DATATYPE_NULL) {
     return MPI_ERR_TYPE;
   } else {
-    smpi_datatype_commit(datatype);
+    (*datatype)->commit();
     return MPI_SUCCESS;
   }
 }
@@ -2185,7 +2189,7 @@ int PMPI_Type_vector(int count, int blocklen, int stride, MPI_Datatype old_type,
   } else if (count<0 || blocklen<0){
     return MPI_ERR_COUNT;
   } else {
-    return smpi_datatype_vector(count, blocklen, stride, old_type, new_type);
+    return simgrid::smpi::Datatype::create_vector(count, blocklen, stride, old_type, new_type);
   }
 }
 
@@ -2195,7 +2199,7 @@ int PMPI_Type_hvector(int count, int blocklen, MPI_Aint stride, MPI_Datatype old
   } else if (count<0 || blocklen<0){
     return MPI_ERR_COUNT;
   } else {
-    return smpi_datatype_hvector(count, blocklen, stride, old_type, new_type);
+    return simgrid::smpi::Datatype::create_hvector(count, blocklen, stride, old_type, new_type);
   }
 }
 
@@ -2209,7 +2213,7 @@ int PMPI_Type_indexed(int count, int* blocklens, int* indices, MPI_Datatype old_
   } else if (count<0){
     return MPI_ERR_COUNT;
   } else {
-    return smpi_datatype_indexed(count, blocklens, indices, old_type, new_type);
+    return simgrid::smpi::Datatype::create_indexed(count, blocklens, indices, old_type, new_type);
   }
 }
 
@@ -2219,7 +2223,7 @@ int PMPI_Type_create_indexed(int count, int* blocklens, int* indices, MPI_Dataty
   } else if (count<0){
     return MPI_ERR_COUNT;
   } else {
-    return smpi_datatype_indexed(count, blocklens, indices, old_type, new_type);
+    return simgrid::smpi::Datatype::create_indexed(count, blocklens, indices, old_type, new_type);
   }
 }
 
@@ -2234,7 +2238,7 @@ int PMPI_Type_create_indexed_block(int count, int blocklength, int* indices, MPI
     int* blocklens=static_cast<int*>(xbt_malloc(blocklength*count*sizeof(int)));
     for (int i    = 0; i < count; i++)
       blocklens[i]=blocklength;
-    int retval    = smpi_datatype_indexed(count, blocklens, indices, old_type, new_type);
+    int retval    = simgrid::smpi::Datatype::create_indexed(count, blocklens, indices, old_type, new_type);
     xbt_free(blocklens);
     return retval;
   }
@@ -2247,7 +2251,7 @@ int PMPI_Type_hindexed(int count, int* blocklens, MPI_Aint* indices, MPI_Datatyp
   } else if (count<0){
     return MPI_ERR_COUNT;
   } else {
-    return smpi_datatype_hindexed(count, blocklens, indices, old_type, new_type);
+    return simgrid::smpi::Datatype::create_hindexed(count, blocklens, indices, old_type, new_type);
   }
 }
 
@@ -2266,7 +2270,7 @@ int PMPI_Type_create_hindexed_block(int count, int blocklength, MPI_Aint* indice
     int* blocklens=(int*)xbt_malloc(blocklength*count*sizeof(int));
     for (int i     = 0; i < count; i++)
       blocklens[i] = blocklength;
-    int retval     = smpi_datatype_hindexed(count, blocklens, indices, old_type, new_type);
+    int retval     = simgrid::smpi::Datatype::create_hindexed(count, blocklens, indices, old_type, new_type);
     xbt_free(blocklens);
     return retval;
   }
@@ -2276,7 +2280,7 @@ int PMPI_Type_struct(int count, int* blocklens, MPI_Aint* indices, MPI_Datatype*
   if (count<0){
     return MPI_ERR_COUNT;
   } else {
-    return smpi_datatype_struct(count, blocklens, indices, old_types, new_type);
+    return simgrid::smpi::Datatype::create_struct(count, blocklens, indices, old_types, new_type);
   }
 }
 
@@ -2292,7 +2296,7 @@ int PMPI_Error_class(int errorcode, int* errorclass) {
 }
 
 int PMPI_Initialized(int* flag) {
-   *flag=smpi_process_initialized();
+   *flag=(smpi_process()!=nullptr && smpi_process()->initialized());
    return MPI_SUCCESS;
 }
 
@@ -2306,7 +2310,10 @@ int PMPI_Cart_create(MPI_Comm comm_old, int ndims, int* dims, int* periodic, int
   } else if (ndims < 0 || (ndims > 0 && (dims == nullptr || periodic == nullptr)) || comm_cart == nullptr) {
     return MPI_ERR_ARG;
   } else{
-    return smpi_mpi_cart_create(comm_old, ndims, dims, periodic, reorder, comm_cart);
+    simgrid::smpi::Topo_Cart* topo = new simgrid::smpi::Topo_Cart(comm_old, ndims, dims, periodic, reorder, comm_cart);
+    if(*comm_cart==MPI_COMM_NULL)
+      delete topo;
+    return MPI_SUCCESS;
   }
 }
 
@@ -2317,7 +2324,11 @@ int PMPI_Cart_rank(MPI_Comm comm, int* coords, int* rank) {
   if (coords == nullptr) {
     return MPI_ERR_ARG;
   }
-  return smpi_mpi_cart_rank(comm, coords, rank);
+  MPIR_Cart_Topology topo = static_cast<MPIR_Cart_Topology>(comm->topo());
+  if (topo==nullptr) {
+    return MPI_ERR_ARG;
+  }
+  return topo->rank(coords, rank);
 }
 
 int PMPI_Cart_shift(MPI_Comm comm, int direction, int displ, int* source, int* dest) {
@@ -2327,7 +2338,11 @@ int PMPI_Cart_shift(MPI_Comm comm, int direction, int displ, int* source, int* d
   if (source == nullptr || dest == nullptr || direction < 0 ) {
     return MPI_ERR_ARG;
   }
-  return smpi_mpi_cart_shift(comm, direction, displ, source, dest);
+  MPIR_Cart_Topology topo = static_cast<MPIR_Cart_Topology>(comm->topo());
+  if (topo==nullptr) {
+    return MPI_ERR_ARG;
+  }
+  return topo->shift(direction, displ, source, dest);
 }
 
 int PMPI_Cart_coords(MPI_Comm comm, int rank, int maxdims, int* coords) {
@@ -2343,7 +2358,11 @@ int PMPI_Cart_coords(MPI_Comm comm, int rank, int maxdims, int* coords) {
   if(coords == nullptr) {
     return MPI_ERR_ARG;
   }
-  return smpi_mpi_cart_coords(comm, rank, maxdims, coords);
+  MPIR_Cart_Topology topo = static_cast<MPIR_Cart_Topology>(comm->topo());
+  if (topo==nullptr) {
+    return MPI_ERR_ARG;
+  }
+  return topo->coords(rank, maxdims, coords);
 }
 
 int PMPI_Cart_get(MPI_Comm comm, int maxdims, int* dims, int* periods, int* coords) {
@@ -2353,7 +2372,11 @@ int PMPI_Cart_get(MPI_Comm comm, int maxdims, int* dims, int* periods, int* coor
   if(maxdims <= 0 || dims == nullptr || periods == nullptr || coords == nullptr) {
     return MPI_ERR_ARG;
   }
-  return smpi_mpi_cart_get(comm, maxdims, dims, periods, coords);
+  MPIR_Cart_Topology topo = static_cast<MPIR_Cart_Topology>(comm->topo());
+  if (topo==nullptr) {
+    return MPI_ERR_ARG;
+  }
+  return topo->get(maxdims, dims, periods, coords);
 }
 
 int PMPI_Cartdim_get(MPI_Comm comm, int* ndims) {
@@ -2363,7 +2386,11 @@ int PMPI_Cartdim_get(MPI_Comm comm, int* ndims) {
   if (ndims == nullptr) {
     return MPI_ERR_ARG;
   }
-  return smpi_mpi_cartdim_get(comm, ndims);
+  MPIR_Cart_Topology topo = static_cast<MPIR_Cart_Topology>(comm->topo());
+  if (topo==nullptr) {
+    return MPI_ERR_ARG;
+  }
+  return topo->dim_get(ndims);
 }
 
 int PMPI_Dims_create(int nnodes, int ndims, int* dims) {
@@ -2373,8 +2400,7 @@ int PMPI_Dims_create(int nnodes, int ndims, int* dims) {
   if (ndims < 1 || nnodes < 1) {
     return MPI_ERR_DIMS;
   }
-
-  return smpi_mpi_dims_create(nnodes, ndims, dims);
+  return simgrid::smpi::Topo_Cart::Dims_create(nnodes, ndims, dims);
 }
 
 int PMPI_Cart_sub(MPI_Comm comm, int* remain_dims, MPI_Comm* comm_new) {
@@ -2384,7 +2410,16 @@ int PMPI_Cart_sub(MPI_Comm comm, int* remain_dims, MPI_Comm* comm_new) {
   if (comm_new == nullptr) {
     return MPI_ERR_ARG;
   }
-  return smpi_mpi_cart_sub(comm, remain_dims, comm_new);
+  MPIR_Cart_Topology topo = static_cast<MPIR_Cart_Topology>(comm->topo());
+  if (topo==nullptr) {
+    return MPI_ERR_ARG;
+  }
+  MPIR_Cart_Topology cart = topo->sub(remain_dims, comm_new);
+  if(*comm_new==MPI_COMM_NULL)
+      delete cart;
+  if(cart==nullptr)
+    return  MPI_ERR_ARG;
+  return MPI_SUCCESS;
 }
 
 int PMPI_Type_create_resized(MPI_Datatype oldtype,MPI_Aint lb, MPI_Aint extent, MPI_Datatype *newtype){
@@ -2395,10 +2430,9 @@ int PMPI_Type_create_resized(MPI_Datatype oldtype,MPI_Aint lb, MPI_Aint extent,
   MPI_Aint disps[3]     = {lb, 0, lb + extent};
   MPI_Datatype types[3] = {MPI_LB, oldtype, MPI_UB};
 
-  s_smpi_mpi_struct_t* subtype = smpi_datatype_struct_create(blocks, disps, 3, types);
-  smpi_datatype_create(newtype, oldtype->size, lb, lb + extent, sizeof(s_smpi_mpi_struct_t), subtype, DT_FLAG_VECTOR);
+  *newtype = new simgrid::smpi::Type_Struct(oldtype->size(), lb, lb + extent, DT_FLAG_DERIVED, 3, blocks, disps, types);
 
-  (*newtype)->flags &= ~DT_FLAG_COMMITED;
+  (*newtype)->addflag(~DT_FLAG_COMMITED);
   return MPI_SUCCESS;
 }
 
@@ -2410,7 +2444,7 @@ int PMPI_Win_create( void *base, MPI_Aint size, int disp_unit, MPI_Info info, MP
   }else if ((base == nullptr && size != 0) || disp_unit <= 0 || size < 0 ){
     retval= MPI_ERR_OTHER;
   }else{
-    *win = smpi_mpi_win_create( base, size, disp_unit, info, comm);
+    *win = new simgrid::smpi::Win( base, size, disp_unit, info, comm);
     retval = MPI_SUCCESS;
   }
   smpi_bench_begin();
@@ -2423,7 +2457,8 @@ int PMPI_Win_free( MPI_Win* win){
   if (win == nullptr || *win == MPI_WIN_NULL) {
     retval = MPI_ERR_WIN;
   }else{
-    retval=smpi_mpi_win_free(win);
+    delete *win;
+    retval=MPI_SUCCESS;
   }
   smpi_bench_begin();
   return retval;
@@ -2436,7 +2471,7 @@ int PMPI_Win_set_name(MPI_Win  win, char * name)
   } else if (name == nullptr)  {
     return MPI_ERR_ARG;
   } else {
-    smpi_mpi_win_set_name(win, name);
+    win->set_name(name);
     return MPI_SUCCESS;
   }
 }
@@ -2448,7 +2483,7 @@ int PMPI_Win_get_name(MPI_Win  win, char * name, int* len)
   } else if (name == nullptr)  {
     return MPI_ERR_ARG;
   } else {
-    smpi_mpi_win_get_name(win, name, len);
+    win->get_name(name, len);
     return MPI_SUCCESS;
   }
 }
@@ -2457,8 +2492,8 @@ int PMPI_Win_get_group(MPI_Win  win, MPI_Group * group){
   if (win == MPI_WIN_NULL)  {
     return MPI_ERR_WIN;
   }else {
-    smpi_mpi_win_get_group(win, group);
-    (*group)->use();
+    win->get_group(group);
+    (*group)->ref();
     return MPI_SUCCESS;
   }
 }
@@ -2469,9 +2504,9 @@ int PMPI_Win_fence( int assert,  MPI_Win win){
   if (win == MPI_WIN_NULL) {
     retval = MPI_ERR_WIN;
   } else {
-  int rank = smpi_process_index();
+  int rank = smpi_process()->index();
   TRACE_smpi_collective_in(rank, -1, __FUNCTION__, nullptr);
-  retval = smpi_mpi_win_fence(assert, win);
+  retval = win->fence(assert);
   TRACE_smpi_collective_out(rank, -1, __FUNCTION__);
   }
   smpi_bench_begin();
@@ -2493,17 +2528,17 @@ int PMPI_Get( void *origin_addr, int origin_count, MPI_Datatype origin_datatype,
   } else if ((origin_count < 0 || target_count < 0) ||
              (origin_addr==nullptr && origin_count > 0)){
     retval = MPI_ERR_COUNT;
-  } else if ((!is_datatype_valid(origin_datatype)) || (!is_datatype_valid(target_datatype))) {
+  } else if ((!origin_datatype->is_valid()) || (!target_datatype->is_valid())) {
     retval = MPI_ERR_TYPE;
   } else {
-    int rank = smpi_process_index();
+    int rank = smpi_process()->index();
     MPI_Group group;
-    smpi_mpi_win_get_group(win, &group);
+    win->get_group(&group);
     int src_traced = group->index(target_rank);
     TRACE_smpi_ptp_in(rank, src_traced, rank, __FUNCTION__, nullptr);
 
-    retval = smpi_mpi_get( origin_addr, origin_count, origin_datatype, target_rank, target_disp, target_count,
-                           target_datatype, win);
+    retval = win->get( origin_addr, origin_count, origin_datatype, target_rank, target_disp, target_count,
+                           target_datatype);
 
     TRACE_smpi_ptp_out(rank, src_traced, rank, __FUNCTION__);
   }
@@ -2526,18 +2561,18 @@ int PMPI_Put( void *origin_addr, int origin_count, MPI_Datatype origin_datatype,
   } else if ((origin_count < 0 || target_count < 0) ||
             (origin_addr==nullptr && origin_count > 0)){
     retval = MPI_ERR_COUNT;
-  } else if ((!is_datatype_valid(origin_datatype)) || (!is_datatype_valid(target_datatype))) {
+  } else if ((!origin_datatype->is_valid()) || (!target_datatype->is_valid())) {
     retval = MPI_ERR_TYPE;
   } else {
-    int rank = smpi_process_index();
+    int rank = smpi_process()->index();
     MPI_Group group;
-    smpi_mpi_win_get_group(win, &group);
+    win->get_group(&group);
     int dst_traced = group->index(target_rank);
     TRACE_smpi_ptp_in(rank, rank, dst_traced, __FUNCTION__, nullptr);
-    TRACE_smpi_send(rank, rank, dst_traced, SMPI_RMA_TAG, origin_count*smpi_datatype_size(origin_datatype));
+    TRACE_smpi_send(rank, rank, dst_traced, SMPI_RMA_TAG, origin_count*origin_datatype->size());
 
-    retval = smpi_mpi_put( origin_addr, origin_count, origin_datatype, target_rank, target_disp, target_count,
-                           target_datatype, win);
+    retval = win->put( origin_addr, origin_count, origin_datatype, target_rank, target_disp, target_count,
+                           target_datatype);
 
     TRACE_smpi_ptp_out(rank, rank, dst_traced, __FUNCTION__);
   }
@@ -2560,20 +2595,60 @@ int PMPI_Accumulate( void *origin_addr, int origin_count, MPI_Datatype origin_da
   } else if ((origin_count < 0 || target_count < 0) ||
              (origin_addr==nullptr && origin_count > 0)){
     retval = MPI_ERR_COUNT;
-  } else if ((!is_datatype_valid(origin_datatype)) ||
-            (!is_datatype_valid(target_datatype))) {
+  } else if ((!origin_datatype->is_valid()) ||
+            (!target_datatype->is_valid())) {
     retval = MPI_ERR_TYPE;
   } else if (op == MPI_OP_NULL) {
     retval = MPI_ERR_OP;
   } else {
-    int rank = smpi_process_index();
+    int rank = smpi_process()->index();
     MPI_Group group;
-    smpi_mpi_win_get_group(win, &group);
+    win->get_group(&group);
     int src_traced = group->index(target_rank);
     TRACE_smpi_ptp_in(rank, src_traced, rank, __FUNCTION__, nullptr);
 
-    retval = smpi_mpi_accumulate( origin_addr, origin_count, origin_datatype, target_rank, target_disp, target_count,
-                                  target_datatype, op, win);
+    retval = win->accumulate( origin_addr, origin_count, origin_datatype, target_rank, target_disp, target_count,
+                                  target_datatype, op);
+
+    TRACE_smpi_ptp_out(rank, src_traced, rank, __FUNCTION__);
+  }
+  smpi_bench_begin();
+  return retval;
+}
+
+int PMPI_Get_accumulate(void *origin_addr, int origin_count, MPI_Datatype origin_datatype, void *result_addr, 
+int result_count, MPI_Datatype result_datatype, int target_rank, MPI_Aint target_disp, int target_count, 
+MPI_Datatype target_datatype, MPI_Op op, MPI_Win win){
+  int retval = 0;
+  smpi_bench_end();
+  if (win == MPI_WIN_NULL) {
+    retval = MPI_ERR_WIN;
+  } else if (target_rank == MPI_PROC_NULL) {
+    retval = MPI_SUCCESS;
+  } else if (target_rank <0){
+    retval = MPI_ERR_RANK;
+  } else if (target_disp <0){
+    retval = MPI_ERR_ARG;
+  } else if ((origin_count < 0 || target_count < 0 || result_count <0) ||
+             (origin_addr==nullptr && origin_count > 0) ||
+             (result_addr==nullptr && result_count > 0)){
+    retval = MPI_ERR_COUNT;
+  } else if ((!origin_datatype->is_valid()) ||
+            (!target_datatype->is_valid())||
+            (!result_datatype->is_valid())) {
+    retval = MPI_ERR_TYPE;
+  } else if (op == MPI_OP_NULL) {
+    retval = MPI_ERR_OP;
+  } else {
+    int rank = smpi_process()->index();
+    MPI_Group group;
+    win->get_group(&group);
+    int src_traced = group->index(target_rank);
+    TRACE_smpi_ptp_in(rank, src_traced, rank, __FUNCTION__, nullptr);
+
+    retval = win->get_accumulate( origin_addr, origin_count, origin_datatype, result_addr, 
+                                  result_count, result_datatype, target_rank, target_disp, 
+                                  target_count, target_datatype, op);
 
     TRACE_smpi_ptp_out(rank, src_traced, rank, __FUNCTION__);
   }
@@ -2589,9 +2664,9 @@ int PMPI_Win_post(MPI_Group group, int assert, MPI_Win win){
   } else if (group==MPI_GROUP_NULL){
     retval = MPI_ERR_GROUP;
   } else {
-    int rank = smpi_process_index();
+    int rank = smpi_process()->index();
     TRACE_smpi_collective_in(rank, -1, __FUNCTION__, nullptr);
-    retval = smpi_mpi_win_post(group,assert,win);
+    retval = win->post(group,assert);
     TRACE_smpi_collective_out(rank, -1, __FUNCTION__);
   }
   smpi_bench_begin();
@@ -2606,9 +2681,9 @@ int PMPI_Win_start(MPI_Group group, int assert, MPI_Win win){
   } else if (group==MPI_GROUP_NULL){
     retval = MPI_ERR_GROUP;
   } else {
-    int rank = smpi_process_index();
+    int rank = smpi_process()->index();
     TRACE_smpi_collective_in(rank, -1, __FUNCTION__, nullptr);
-    retval = smpi_mpi_win_start(group,assert,win);
+    retval = win->start(group,assert);
     TRACE_smpi_collective_out(rank, -1, __FUNCTION__);
   }
   smpi_bench_begin();
@@ -2621,10 +2696,10 @@ int PMPI_Win_complete(MPI_Win win){
   if (win == MPI_WIN_NULL) {
     retval = MPI_ERR_WIN;
   } else {
-    int rank = smpi_process_index();
+    int rank = smpi_process()->index();
     TRACE_smpi_collective_in(rank, -1, __FUNCTION__, nullptr);
 
-    retval = smpi_mpi_win_complete(win);
+    retval = win->complete();
 
     TRACE_smpi_collective_out(rank, -1, __FUNCTION__);
   }
@@ -2638,10 +2713,10 @@ int PMPI_Win_wait(MPI_Win win){
   if (win == MPI_WIN_NULL) {
     retval = MPI_ERR_WIN;
   } else {
-    int rank = smpi_process_index();
+    int rank = smpi_process()->index();
     TRACE_smpi_collective_in(rank, -1, __FUNCTION__, nullptr);
 
-    retval = smpi_mpi_win_wait(win);
+    retval = win->wait();
 
     TRACE_smpi_collective_out(rank, -1, __FUNCTION__);
   }
@@ -2649,6 +2724,43 @@ int PMPI_Win_wait(MPI_Win win){
   return retval;
 }
 
+int PMPI_Win_lock(int lock_type, int rank, int assert, MPI_Win win){
+  int retval = 0;
+  smpi_bench_end();
+  if (win == MPI_WIN_NULL) {
+    retval = MPI_ERR_WIN;
+  } else if (lock_type != MPI_LOCK_EXCLUSIVE && 
+             lock_type != MPI_LOCK_SHARED) {
+    retval = MPI_ERR_LOCKTYPE;
+  } else if (rank == MPI_PROC_NULL){ 
+    retval = MPI_SUCCESS;
+  } else {
+    int myrank = smpi_process()->index();
+    TRACE_smpi_collective_in(myrank, -1, __FUNCTION__, nullptr);
+    retval = win->lock(lock_type,rank,assert);
+    TRACE_smpi_collective_out(myrank, -1, __FUNCTION__);
+  }
+  smpi_bench_begin();
+  return retval;
+}
+
+int PMPI_Win_unlock(int rank, MPI_Win win){
+  int retval = 0;
+  smpi_bench_end();
+  if (win == MPI_WIN_NULL) {
+    retval = MPI_ERR_WIN;
+  } else if (rank == MPI_PROC_NULL){ 
+    retval = MPI_SUCCESS;
+  } else {
+    int myrank = smpi_process()->index();
+    TRACE_smpi_collective_in(myrank, -1, __FUNCTION__, nullptr);
+    retval = win->unlock(rank);
+    TRACE_smpi_collective_out(myrank, -1, __FUNCTION__);
+  }
+  smpi_bench_begin();
+  return retval;
+}
+
 int PMPI_Alloc_mem(MPI_Aint size, MPI_Info info, void *baseptr){
   void *ptr = xbt_malloc(size);
   if(ptr==nullptr)
@@ -2671,7 +2783,7 @@ int PMPI_Type_set_name(MPI_Datatype  datatype, char * name)
   } else if (name == nullptr)  {
     return MPI_ERR_ARG;
   } else {
-    smpi_datatype_set_name(datatype, name);
+    datatype->set_name(name);
     return MPI_SUCCESS;
   }
 }
@@ -2683,73 +2795,75 @@ int PMPI_Type_get_name(MPI_Datatype  datatype, char * name, int* len)
   } else if (name == nullptr)  {
     return MPI_ERR_ARG;
   } else {
-    smpi_datatype_get_name(datatype, name, len);
+    datatype->get_name(name, len);
     return MPI_SUCCESS;
   }
 }
 
 MPI_Datatype PMPI_Type_f2c(MPI_Fint datatype){
-  return smpi_type_f2c(datatype);
+  return static_cast<MPI_Datatype>(simgrid::smpi::F2C::f2c(datatype));
 }
 
 MPI_Fint PMPI_Type_c2f(MPI_Datatype datatype){
-  return smpi_type_c2f( datatype);
+  return datatype->c2f();
 }
 
 MPI_Group PMPI_Group_f2c(MPI_Fint group){
-  return smpi_group_f2c( group);
+  return simgrid::smpi::Group::f2c(group);
 }
 
 MPI_Fint PMPI_Group_c2f(MPI_Group group){
-  return smpi_group_c2f(group);
+  return group->c2f();
 }
 
 MPI_Request PMPI_Request_f2c(MPI_Fint request){
-  return smpi_request_f2c(request);
+  return static_cast<MPI_Request>(simgrid::smpi::Request::f2c(request));
 }
 
 MPI_Fint PMPI_Request_c2f(MPI_Request request) {
-  return smpi_request_c2f(request);
+  return request->c2f();
 }
 
 MPI_Win PMPI_Win_f2c(MPI_Fint win){
-  return smpi_win_f2c(win);
+  return static_cast<MPI_Win>(simgrid::smpi::Win::f2c(win));
 }
 
 MPI_Fint PMPI_Win_c2f(MPI_Win win){
-  return smpi_win_c2f(win);
+  return win->c2f();
 }
 
 MPI_Op PMPI_Op_f2c(MPI_Fint op){
-  return smpi_op_f2c(op);
+  return static_cast<MPI_Op>(simgrid::smpi::Op::f2c(op));
 }
 
 MPI_Fint PMPI_Op_c2f(MPI_Op op){
-  return smpi_op_c2f(op);
+  return op->c2f();
 }
 
 MPI_Comm PMPI_Comm_f2c(MPI_Fint comm){
-  return smpi_comm_f2c(comm);
+  return static_cast<MPI_Comm>(simgrid::smpi::Comm::f2c(comm));
 }
 
 MPI_Fint PMPI_Comm_c2f(MPI_Comm comm){
-  return smpi_comm_c2f(comm);
+  return comm->c2f();
 }
 
 MPI_Info PMPI_Info_f2c(MPI_Fint info){
-  return smpi_info_f2c(info);
+  return static_cast<MPI_Info>(simgrid::smpi::Info::f2c(info));
 }
 
 MPI_Fint PMPI_Info_c2f(MPI_Info info){
-  return smpi_info_c2f(info);
+  return info->c2f();
 }
 
 int PMPI_Keyval_create(MPI_Copy_function* copy_fn, MPI_Delete_function* delete_fn, int* keyval, void* extra_state) {
-  return smpi_comm_keyval_create(copy_fn, delete_fn, keyval, extra_state);
+  smpi_copy_fn _copy_fn={copy_fn,nullptr,nullptr};
+  smpi_delete_fn _delete_fn={delete_fn,nullptr,nullptr};
+  return simgrid::smpi::Keyval::keyval_create<simgrid::smpi::Comm>(_copy_fn, _delete_fn, keyval, extra_state);
 }
 
 int PMPI_Keyval_free(int* keyval) {
-  return smpi_comm_keyval_free(keyval);
+  return simgrid::smpi::Keyval::keyval_free<simgrid::smpi::Comm>(keyval);
 }
 
 int PMPI_Attr_delete(MPI_Comm comm, int keyval) {
@@ -2759,7 +2873,7 @@ int PMPI_Attr_delete(MPI_Comm comm, int keyval) {
   else if (comm==MPI_COMM_NULL)
     return MPI_ERR_COMM;
   else
-    return comm->attr_delete(keyval);
+    return comm->attr_delete<simgrid::smpi::Comm>(keyval);
 }
 
 int PMPI_Attr_get(MPI_Comm comm, int keyval, void* attr_value, int* flag) {
@@ -2797,7 +2911,7 @@ int PMPI_Attr_get(MPI_Comm comm, int keyval, void* attr_value, int* flag) {
     *static_cast<int**>(attr_value) = &one;
     return MPI_SUCCESS;
   default:
-    return comm->attr_get(keyval, attr_value, flag);
+    return comm->attr_get<simgrid::smpi::Comm>(keyval, attr_value, flag);
   }
 }
 
@@ -2808,7 +2922,7 @@ int PMPI_Attr_put(MPI_Comm comm, int keyval, void* attr_value) {
   else if (comm==MPI_COMM_NULL)
     return MPI_ERR_COMM;
   else
-  return comm->attr_put(keyval, attr_value);
+  return comm->attr_put<simgrid::smpi::Comm>(keyval, attr_value);
 }
 
 int PMPI_Comm_get_attr (MPI_Comm comm, int comm_keyval, void *attribute_val, int *flag)
@@ -2841,7 +2955,7 @@ int PMPI_Type_get_attr (MPI_Datatype type, int type_keyval, void *attribute_val,
   if (type==MPI_DATATYPE_NULL)
     return MPI_ERR_TYPE;
   else
-    return smpi_type_attr_get(type, type_keyval, attribute_val, flag);
+    return type->attr_get<simgrid::smpi::Datatype>(type_keyval, attribute_val, flag);
 }
 
 int PMPI_Type_set_attr (MPI_Datatype type, int type_keyval, void *attribute_val)
@@ -2849,7 +2963,7 @@ int PMPI_Type_set_attr (MPI_Datatype type, int type_keyval, void *attribute_val)
   if (type==MPI_DATATYPE_NULL)
     return MPI_ERR_TYPE;
   else
-    return smpi_type_attr_put(type, type_keyval, attribute_val);
+    return type->attr_put<simgrid::smpi::Datatype>(type_keyval, attribute_val);
 }
 
 int PMPI_Type_delete_attr (MPI_Datatype type, int type_keyval)
@@ -2857,44 +2971,96 @@ int PMPI_Type_delete_attr (MPI_Datatype type, int type_keyval)
   if (type==MPI_DATATYPE_NULL)
     return MPI_ERR_TYPE;
   else
-    return smpi_type_attr_delete(type, type_keyval);
+    return type->attr_delete<simgrid::smpi::Datatype>(type_keyval);
 }
 
 int PMPI_Type_create_keyval(MPI_Type_copy_attr_function* copy_fn, MPI_Type_delete_attr_function* delete_fn, int* keyval,
                             void* extra_state)
 {
-  return smpi_type_keyval_create(copy_fn, delete_fn, keyval, extra_state);
+  smpi_copy_fn _copy_fn={nullptr,copy_fn,nullptr};
+  smpi_delete_fn _delete_fn={nullptr,delete_fn,nullptr};
+  return simgrid::smpi::Keyval::keyval_create<simgrid::smpi::Datatype>(_copy_fn, _delete_fn, keyval, extra_state);
 }
 
 int PMPI_Type_free_keyval(int* keyval) {
-  return smpi_type_keyval_free(keyval);
+  return simgrid::smpi::Keyval::keyval_free<simgrid::smpi::Datatype>(keyval);
+}
+
+int PMPI_Win_get_attr (MPI_Win win, int keyval, void *attribute_val, int* flag)
+{
+  static MPI_Aint size;
+  static int disp_unit;
+  if (win==MPI_WIN_NULL)
+    return MPI_ERR_TYPE;
+  else{
+  switch (keyval) {
+    case MPI_WIN_BASE :
+      *static_cast<void**>(attribute_val)  = win->base();
+      *flag = 1;
+      return MPI_SUCCESS;
+    case MPI_WIN_SIZE :
+      size = win->size();
+      *static_cast<MPI_Aint**>(attribute_val)  = &size;
+      *flag = 1;
+      return MPI_SUCCESS;
+    case MPI_WIN_DISP_UNIT :
+      disp_unit=win->disp_unit();
+      *static_cast<int**>(attribute_val)  = &disp_unit;
+      *flag = 1;
+      return MPI_SUCCESS;
+    default:
+      return win->attr_get<simgrid::smpi::Win>(keyval, attribute_val, flag);
+  }
+}
+
+}
+
+int PMPI_Win_set_attr (MPI_Win win, int type_keyval, void *attribute_val)
+{
+  if (win==MPI_WIN_NULL)
+    return MPI_ERR_TYPE;
+  else
+    return win->attr_put<simgrid::smpi::Win>(type_keyval, attribute_val);
+}
+
+int PMPI_Win_delete_attr (MPI_Win win, int type_keyval)
+{
+  if (win==MPI_WIN_NULL)
+    return MPI_ERR_TYPE;
+  else
+    return win->attr_delete<simgrid::smpi::Win>(type_keyval);
+}
+
+int PMPI_Win_create_keyval(MPI_Win_copy_attr_function* copy_fn, MPI_Win_delete_attr_function* delete_fn, int* keyval,
+                            void* extra_state)
+{
+  smpi_copy_fn _copy_fn={nullptr, nullptr, copy_fn};
+  smpi_delete_fn _delete_fn={nullptr, nullptr, delete_fn};
+  return simgrid::smpi::Keyval::keyval_create<simgrid::smpi::Win>(_copy_fn, _delete_fn, keyval, extra_state);
+}
+
+int PMPI_Win_free_keyval(int* keyval) {
+  return simgrid::smpi::Keyval::keyval_free<simgrid::smpi::Win>(keyval);
 }
 
 int PMPI_Info_create( MPI_Info *info){
   if (info == nullptr)
     return MPI_ERR_ARG;
-  *info = xbt_new(s_smpi_mpi_info_t, 1);
-  (*info)->info_dict= xbt_dict_new_homogeneous(xbt_free_f);
-  (*info)->refcount=1;
+  *info = new simgrid::smpi::Info();
   return MPI_SUCCESS;
 }
 
 int PMPI_Info_set( MPI_Info info, char *key, char *value){
   if (info == nullptr || key == nullptr || value == nullptr)
     return MPI_ERR_ARG;
-
-  xbt_dict_set(info->info_dict, key, xbt_strdup(value), nullptr);
+  info->set(key, value);
   return MPI_SUCCESS;
 }
 
 int PMPI_Info_free( MPI_Info *info){
   if (info == nullptr || *info==nullptr)
     return MPI_ERR_ARG;
-  (*info)->refcount--;
-  if((*info)->refcount==0){
-    xbt_dict_free(&((*info)->info_dict));
-    xbt_free(*info);
-  }
+  simgrid::smpi::Info::unref(*info);
   *info=MPI_INFO_NULL;
   return MPI_SUCCESS;
 }
@@ -2905,109 +3071,70 @@ int PMPI_Info_get(MPI_Info info,char *key,int valuelen, char *value, int *flag){
     return MPI_ERR_ARG;
   if (value == nullptr)
     return MPI_ERR_INFO_VALUE;
-  char* tmpvalue=static_cast<char*>(xbt_dict_get_or_null(info->info_dict, key));
-  if(tmpvalue){
-    memset(value, 0, valuelen);
-    memcpy(value,tmpvalue, (strlen(tmpvalue) + 1 < static_cast<size_t>(valuelen)) ? strlen(tmpvalue) + 1 : valuelen);
-    *flag=true;
-  }
-  return MPI_SUCCESS;
+  return info->get(key, valuelen, value, flag);
 }
 
 int PMPI_Info_dup(MPI_Info info, MPI_Info *newinfo){
   if (info == nullptr || newinfo==nullptr)
     return MPI_ERR_ARG;
-  *newinfo = xbt_new(s_smpi_mpi_info_t, 1);
-  (*newinfo)->info_dict= xbt_dict_new_homogeneous(xbt_free_f);
-  (*newinfo)->refcount=1;
-  xbt_dict_cursor_t cursor = nullptr;
-  char* key;
-  void* data;
-  xbt_dict_foreach(info->info_dict,cursor,key,data){
-    xbt_dict_set((*newinfo)->info_dict, key, xbt_strdup(static_cast<char*>(data)), nullptr);
-  }
+  *newinfo = new simgrid::smpi::Info(info);
   return MPI_SUCCESS;
 }
 
 int PMPI_Info_delete(MPI_Info info, char *key){
   if (info == nullptr || key==nullptr)
     return MPI_ERR_ARG;
-  try {
-    xbt_dict_remove(info->info_dict, key);
-  }
-  catch(xbt_ex& e){
-    return MPI_ERR_INFO_NOKEY;
-  }
-  return MPI_SUCCESS;
+  return info->remove(key);
 }
 
 int PMPI_Info_get_nkeys( MPI_Info info, int *nkeys){
   if (info == nullptr || nkeys==nullptr)
     return MPI_ERR_ARG;
-  *nkeys=xbt_dict_size(info->info_dict);
-  return MPI_SUCCESS;
+  return info->get_nkeys(nkeys);
 }
 
 int PMPI_Info_get_nthkey( MPI_Info info, int n, char *key){
   if (info == nullptr || key==nullptr || n<0 || n> MPI_MAX_INFO_KEY)
     return MPI_ERR_ARG;
-
-  xbt_dict_cursor_t cursor = nullptr;
-  char *keyn;
-  void* data;
-  int num=0;
-  xbt_dict_foreach(info->info_dict,cursor,keyn,data){
-    if(num==n){
-      strncpy(key,keyn,strlen(keyn)+1);
-      xbt_dict_cursor_free(&cursor);
-      return MPI_SUCCESS;
-    }
-    num++;
-  }
-  return MPI_ERR_ARG;
+  return info->get_nthkey(n, key);
 }
 
 int PMPI_Info_get_valuelen( MPI_Info info, char *key, int *valuelen, int *flag){
   *flag=false;
   if (info == nullptr || key == nullptr || valuelen==nullptr)
     return MPI_ERR_ARG;
-  char* tmpvalue=(char*)xbt_dict_get_or_null(info->info_dict, key);
-  if(tmpvalue){
-    *valuelen=strlen(tmpvalue);
-    *flag=true;
-  }
-  return MPI_SUCCESS;
+  return info->get_valuelen(key, valuelen, flag);
 }
 
 int PMPI_Unpack(void* inbuf, int incount, int* position, void* outbuf, int outcount, MPI_Datatype type, MPI_Comm comm) {
   if(incount<0 || outcount < 0 || inbuf==nullptr || outbuf==nullptr)
     return MPI_ERR_ARG;
-  if(!is_datatype_valid(type))
+  if(!type->is_valid())
     return MPI_ERR_TYPE;
   if(comm==MPI_COMM_NULL)
     return MPI_ERR_COMM;
-  return smpi_mpi_unpack(inbuf, incount, position, outbuf,outcount,type, comm);
+  return type->unpack(inbuf, incount, position, outbuf,outcount, comm);
 }
 
 int PMPI_Pack(void* inbuf, int incount, MPI_Datatype type, void* outbuf, int outcount, int* position, MPI_Comm comm) {
   if(incount<0 || outcount < 0|| inbuf==nullptr || outbuf==nullptr)
     return MPI_ERR_ARG;
-  if(!is_datatype_valid(type))
+  if(!type->is_valid())
     return MPI_ERR_TYPE;
   if(comm==MPI_COMM_NULL)
     return MPI_ERR_COMM;
-  return smpi_mpi_pack(inbuf, incount, type, outbuf,outcount,position, comm);
+  return type->pack(inbuf, incount, outbuf,outcount,position, comm);
 }
 
 int PMPI_Pack_size(int incount, MPI_Datatype datatype, MPI_Comm comm, int* size) {
   if(incount<0)
     return MPI_ERR_ARG;
-  if(!is_datatype_valid(datatype))
+  if(!datatype->is_valid())
     return MPI_ERR_TYPE;
   if(comm==MPI_COMM_NULL)
     return MPI_ERR_COMM;
 
-  *size=incount*smpi_datatype_size(datatype);
+  *size=incount*datatype->size();
 
   return MPI_SUCCESS;
 }