-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(void);
+void smpi_process_finalize(void);
+int smpi_mpi_comm_rank(smpi_mpi_communicator_t 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_wait(smpi_mpi_request_t request, smpi_mpi_status_t * status);
+
+void smpi_execute(double duration);
+void smpi_start_timer(void);
+double smpi_stop_timer(void);