record__thread_mask_alloc
ret = record__thread_mask_alloc(&rec->thread_masks[t], nr_bits);
ret = record__thread_mask_alloc(&full_mask, cpu__max_cpu().cpu);
ret = record__thread_mask_alloc(&thread_mask, cpu__max_cpu().cpu);
ret = record__thread_mask_alloc(&thread_mask, cpu__max_cpu().cpu);