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v0.5.1
https://github.com/python/cpython
09 December 2020, 11:06:31 UTC
Revision 9a513efffa9797e01745dab57dce3dc8e76bf28e authored by Guido van Rossum on 09 October 1997, 23:32:24 UTC, committed by Guido van Rossum on 09 October 1997, 23:32:24 UTC 
Final touch -- Don's SGI_ABI patches.
1 parent 9192267
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Tip revision: 9a513efffa9797e01745dab57dce3dc8e76bf28e authored by Guido van Rossum on 09 October 1997, 23:32:24 UTC
Final touch -- Don's SGI_ABI patches.
Tip revision: 9a513ef
lockfile.py 
import struct, fcntl, 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))
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