| 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)) |