-smx_action_t SIMIX_process_join(smx_process_t issuer, smx_process_t process, double timeout);
-smx_action_t SIMIX_process_sleep(smx_process_t process, double duration);
-void SIMIX_post_process_sleep(smx_action_t action);
+smx_synchro_t SIMIX_process_join(smx_process_t issuer, smx_process_t process, double timeout);
+smx_synchro_t SIMIX_process_sleep(smx_process_t process, double duration);
+void SIMIX_post_process_sleep(smx_synchro_t synchro);