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v0.5.1
https://github.com/python/cpython
09 December 2020, 11:06:31 UTC
Revision 9b24649118b99987a42fcab0a9793bd5d2b0d762 authored by cvs2svn on 15 August 1997, 20:18:44 UTC, committed by cvs2svn on 15 August 1997, 20:18:44 UTC 
This commit was manufactured by cvs2svn to create tag 'r15a3'.
1 parent 1fed5b3
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Tip revision: 9b24649118b99987a42fcab0a9793bd5d2b0d762 authored by cvs2svn on 15 August 1997, 20:18:44 UTC
This commit was manufactured by cvs2svn to create tag 'r15a3'.
Tip revision: 9b24649
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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