code: def _roundup(n, alignment):
      # alignment must be a power of 2
      mask = alignment - 1
      return (n + mask) & ~mask
  
imports: import bisect
  from collections import defaultdict
  import mmap
  import os
  import sys
  import tempfile
  import threading
  from .context import reduction, assert_spawning
  from .None import util
label_desc: Use image node_id 2 for calling the Heap obj's underlying member method code with example usage: obj._roundup(n, alignment) and returns: unknown