import os
from fcntl import lockf, LOCK_EX, LOCK_UN

def get_edition_count(counter_path):
  # Try to open a file descriptor to the given path
  fd = os.open(counter_path, os.O_RDWR|os.O_CREAT)
  # Lock the file so it can't be read in other processes
  lockf(fd, LOCK_EX)
  
  # Open the file and read
  fo = os.fdopen(fd, 'r+', encoding='utf-8')
  content = fo.read()
  if not content:
    edition_count = 0
  else:
    edition_count = int(content.strip())
  edition_count += 1

  # Clear file, write incremented value, unlock file and close
  fo.seek(0)
  fo.truncate()
  fo.write(str(edition_count))
  fo.flush()
  lockf(fd, LOCK_UN)
  os.close(fd)

  return edition_count