-smx_activity_t comm_iprobe(smx_mailbox_t mbox, int type, int src, int tag, simix_match_func_t match_fun, void* data);
-void comm_send(smx_actor_t sender, smx_mailbox_t mbox, double task_size, double rate, void* src_buff, size_t src_buff_size, simix_match_func_t match_fun, simix_copy_data_func_t copy_data_fun, void* data, double timeout) [[block]];
-smx_activity_t comm_isend(smx_actor_t sender, smx_mailbox_t mbox, double task_size, double rate, void* src_buff, size_t src_buff_size, simix_match_func_t match_fun, simix_clean_func_t clean_fun, simix_copy_data_func_t copy_data_fun, void* data, int detached);
-void comm_recv(smx_actor_t receiver, smx_mailbox_t mbox, void* dst_buff, size_t* dst_buff_size, simix_match_func_t match_fun, simix_copy_data_func_t copy_data_fun, void* data, double timeout, double rate) [[block]];
-smx_activity_t comm_irecv(smx_actor_t receiver, smx_mailbox_t mbox, void* dst_buff, size_t* dst_buff_size, simix_match_func_t match_fun, simix_copy_data_func_t copy_data_fun, void* data, double rate);
-int comm_waitany(xbt_dynar_t comms, double timeout) [[block]];
-void comm_wait(smx_activity_t comm, double timeout) [[block]];
-int comm_test(smx_activity_t comm) [[block]];
-int comm_testany(smx_activity_t* comms, size_t count) [[block]];
-
-smx_mutex_t mutex_init();