Lib/lib-old/lockfile.py

   1 import struct, fcntl
   2
   3 def writelock(f):
   4         _lock(f, fcntl.F_WRLCK)
   5
   6 def readlock(f):
   7         _lock(f, fcntl.F_RDLCK)
   8
   9 def unlock(f):
  10         _lock(f, fcntl.F_UNLCK)
  11
  12 def _lock(f, op):
  13         dummy = fcntl.fcntl(f.fileno(), fcntl.F_SETLKW,
  14                             struct.pack('2h8l', op,
  15                                         0, 0, 0, 0, 0, 0, 0, 0, 0))