Python flock (Window+Linux都可用)[待測]

從網上面找來的,由於發現 Python 本身並沒有提供兩平台都可使用的文件鎖.
所以就在網上面找了找,還好,不用花太多時間就找到下面的代碼,先留用.
明天再來測試下..

#!/usr/bin/python
import os

# needs win32all to work on Windows
if os.name == 'nt':
    import win32con, win32file, pywintypes
    LOCK_EX = win32con.LOCKFILE_EXCLUSIVE_LOCK
    LOCK_SH = 0 # the default
    LOCK_NB = win32con.LOCKFILE_FAIL_IMMEDIATELY
    _ _overlapped = pywintypes.OVERLAPPED(  )

    def lock(file, flags):
        hfile = win32file._get_osfhandle(file.fileno(  ))
        win32file.LockFileEx(hfile, flags, 0, 0xffff0000, _ _overlapped)

    def unlock(file):
        hfile = win32file._get_osfhandle(file.fileno(  ))
        win32file.UnlockFileEx(hfile, 0, 0xffff0000, _ _overlapped)
elif os.name == 'posix':
    from fcntl import LOCK_EX, LOCK_SH, LOCK_NB

    def lock(file, flags):
        fcntl.flock(file.fileno(  ), flags)

    def unlock(file):
        fcntl.flock(file.fileno(  ), fcntl.LOCK_UN)
else:
    raise RuntimeError("PortaLocker only defined for nt and posix platforms")

#!/usr/bin/python
import portalocker
file = open("somefile", "r+")
portalocker.lock(file, portalocker.LOCK_EX)