+MPI_CALL(XBT_PUBLIC(int), MPI_Win_get_attr, (MPI_Win type, int type_keyval, void *attribute_val, int* flag));
+MPI_CALL(XBT_PUBLIC(int), MPI_Win_set_attr, (MPI_Win type, int type_keyval, void *att));
+MPI_CALL(XBT_PUBLIC(int), MPI_Win_delete_attr, (MPI_Win type, int comm_keyval));
+MPI_CALL(XBT_PUBLIC(int), MPI_Win_create_keyval,(MPI_Win_copy_attr_function* copy_fn,
+ MPI_Win_delete_attr_function* delete_fn, int* keyval, void* extra_state));
+MPI_CALL(XBT_PUBLIC(int), MPI_Win_free_keyval,(int* keyval));
+