-XBT_PRIVATE char* instr_process_id(msg_process_t proc, char* str, int len);
-XBT_PRIVATE char* instr_process_id_2(const char* process_name, int process_pid, char* str, int len);
-XBT_PRIVATE void TRACE_msg_process_change_host(msg_process_t process, msg_host_t new_host);
-XBT_PRIVATE void TRACE_msg_process_create(const char* process_name, int process_pid, msg_host_t host);
-XBT_PRIVATE void TRACE_msg_process_destroy(const char* process_name, int process_pid);