python IPC

文件锁

• lock

  import fcntl
  fd = open('lock_file', 'w+')
  fcntl.flock(fd.fileno(), fcntl.LOCK_EX)
  

• unlock

  import fcntl
  fd = open('lock_file', 'w+')
  fcntl.flock(fd.fileno(), fcntl.LOCK_UN) 
  
  

• try lock

  import fcntl
  try:
  	fd = open('lock_file', 'w+')
  	fcntl.flock(fd.fileno(), fcntl.LOCK_EX | fcntl.LOCK_NB)
  	# get lock 
  except IOError as e : 
  	# failed to get lock 
  

ref

• file lock in python
• fcntl — The fcntl and ioctl system calls - 3.8.1