Module locked_file

source code

Locked file interface that should work on Unix and Windows pythons.

This module first tries to use fcntl locking to ensure serialized access
to a file, then falls back on a lock file if that is unavialable.

Usage:
    f = LockedFile('filename', 'r+b', 'rb')
    f.open_and_lock()
    if f.is_locked():
      print('Acquired filename with r+b mode')
      f.file_handle().write('locked data')
    else:
      print('Acquired filename with rb mode')
    f.unlock_and_close()