// out : success (0) and height
int processlist_add(ProcessList *process_list, guint pid, LttTime *birth,
guint trace_num, const gchar *name, guint *height,
// out : success (0) and height
int processlist_add(ProcessList *process_list, guint pid, LttTime *birth,
guint trace_num, const gchar *name, guint *height,