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Python Source  |  2008-07-29  |  281 b   |  16 lines
  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))
  16.