thread__ppid
while (thread__ppid(a) != thread__ppid(b)) {
parent = machine__find_thread(machine, -1, thread__ppid(a));
parent = machine__find_thread(machine, -1, thread__ppid(b));
if (thread__ppid(thread) <= 0)
parent_thread = machine__find_thread(machine, -1, thread__ppid(thread));
thread__ppid(thread), level, "");
if (thread__ppid(a) == thread__ppid(b))
struct thread *parent = machine__find_thread(machine, -1, thread__ppid(a));
struct thread *parent = machine__find_thread(machine, -1, thread__ppid(b));
comm_width, timehist_get_commstr(t), thread__ppid(t),
comm_width, timehist_get_commstr(t), thread__ppid(t),
thread__ppid(thread),
thread__ppid(thread));