thread_map__new_by_pid
threads = thread_map__new_by_pid(getpid());
map = thread_map__new_by_pid(getpid());
map = thread_map__new_by_pid(getpid());
threads = thread_map__new_by_pid(getpid());
return thread_map__new_by_pid(pid);
struct perf_thread_map *thread_map__new_by_pid(pid_t pid);