However, using highbits=0x7fff0000 # equals hex(sys.maxint) gives no errors, but does locking work if highbits are not exactly 0xffff0000?
Try using highbits=-0x7fff0000 as your mask. That should set the MSB without tripping over the sys.maxint limit.
Cheers, Nick. -- http://mail.python.org/mailman/listinfo/python-list
