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//usr/lib/python2.4/lib-old/lockfile.py
import struct, fcntl def writelock(f): _lock(f, fcntl.F_WRLCK) def readlock(f): _lock(f, fcntl.F_RDLCK) def unlock(f): _lock(f, fcntl.F_UNLCK) def _lock(f, op): dummy = fcntl.fcntl(f.fileno(), fcntl.F_SETLKW, struct.pack('2h8l', op, 0, 0, 0, 0, 0, 0, 0, 0, 0))