-int smpi_mpi_comm_size(smpi_mpi_communicator_t *comm);
-int smpi_mpi_comm_rank(smpi_mpi_communicator_t *comm, smx_host_t host);
-int smpi_mpi_comm_rank_self(smpi_mpi_communicator_t *comm);
-int smpi_mpi_comm_world_rank_self(void);
-int smpi_sender(int argc, char **argv);
-int smpi_receiver(int argc, char **argv);
-void *smpi_request_new(void);
-void smpi_request_free(void *pointer);
-void smpi_request_reset(void *pointer);
-void *smpi_message_new(void);
-void smpi_message_free(void *pointer);
-void smpi_message_reset(void *pointer);
-void smpi_global_init(void);
-void smpi_global_destroy(void);
-int smpi_run_simulation(int argc, char **argv);
-void smpi_mpi_land_func(void *x, void *y, void *z);
-void smpi_mpi_sum_func(void *x, void *y, void *z);
-void smpi_mpi_init(void);
-void smpi_mpi_finalize(void);
+void smpi_process_init(int *argc, char ***argv);
+void smpi_process_finalize(void);
+int smpi_mpi_comm_rank(smpi_mpi_communicator_t comm);
+int smpi_mpi_type_get_extent(MPI_Datatype datatype, MPI_Aint *lb, MPI_Aint *extent);
+
+int smpi_mpi_bcast(void *buf, int count, MPI_Datatype datatype, int root, MPI_Comm comm);
+int smpi_mpi_barrier(smpi_mpi_communicator_t comm);
+
+int smpi_mpi_isend(smpi_mpi_request_t request);
+int smpi_mpi_irecv(smpi_mpi_request_t request);
+int smpi_mpi_reduce(void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype, MPI_Op op, int root, MPI_Comm comm);
+int smpi_mpi_sendrecv(void *sendbuf, int sendcount, MPI_Datatype sendtype, int dest, int sendtag,
+ void *recvbuf, int recvcount, MPI_Datatype recvtype, int source, int recvtag,
+ MPI_Comm comm, MPI_Status *status);
+int smpi_mpi_wait(smpi_mpi_request_t request, smpi_mpi_status_t * status);
+int smpi_mpi_waitall(int count, smpi_mpi_request_t requests[], smpi_mpi_status_t status[]);
+int smpi_mpi_waitany(int count, smpi_mpi_request_t requests[], int *index, smpi_mpi_status_t status[]);
+
+
+// utilities
+void smpi_execute(double duration);
+void smpi_start_timer(void);
+double smpi_stop_timer(void);