kdb_thr_first
for (td = kdb_thr_first(); td != NULL; td = kdb_thr_next(td)) {
for (td = kdb_thr_first(); td != NULL; td = kdb_thr_next(td)) {
thr = kdb_thr_first();
ctx.iter = kdb_thr_first();
thr_iter = kdb_thr_first();
thr = kdb_thr_first();
for (thr = kdb_thr_first(); thr != NULL; thr = kdb_thr_next(thr)) {
struct thread *kdb_thr_first(void);