-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);