class_docstr: Uses the :func:`msvcrt.locking` function to hard lock the lock file on windows systems.
code: def _acquire(self):
      raise_on_exist_ro_file(self._lock_file)
      mode = (
          os.O_RDWR  # open for read and write
          | os.O_CREAT  # create file if not exists
          | os.O_TRUNC  # truncate file  if not empty
      )
      try:
          fd = os.open(self._lock_file, mode)
      except OSError as exception:
          if exception.errno == ENOENT:  # No such file or directory
              raise
      else:
          try:
              msvcrt.locking(fd, msvcrt.LK_NBLCK, 1)
          except (
              OSError,
              IOError,
          ):  # noqa: B014 # IOError is not OSError on python 2
              os.close(fd)
          else:
              self._lock_file_fd = fd
  
file_path: catboost/contrib/python/filelock/py2/filelock/_windows.py
imports: import os
  from errno import ENOENT
  from ._api import BaseFileLock
  from ._util import raise_on_exist_ro_file
label_desc: Use image node_id 1 for calling the WindowsFileLock obj's underlying member method code with example usage: obj._acquire() without return types