Nathan Whitehorn 83ae3d5531 On non-64-bit systems (which generally don't have lwsync), use eieio and
isync to implement read and write barriers, following Appendix B.2 of
Book II of the architecture manual. This provides a 25% speed increase
to fork() on the PowerPC G4.
2012-04-22 20:23:34 +00:00
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