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32 bit systems?32 bit systems?Posted Sep 6, 2013 18:33 UTC (Fri) by simlo (subscriber, #10866)Parent article: Introducing lockrefs
Is cmpxchg 64 bit atomic on those?
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32 bit systems? Posted Sep 6, 2013 21:37 UTC (Fri) by marcH (subscriber, #57642) [Link]
I'd better be...
Shorter version of the article: atomic hardware operations are not limited to 32 bits any more.
32 bit systems? Posted Sep 7, 2013 16:15 UTC (Sat) by peter-b (subscriber, #66996) [Link]
I use 128-bit CAS (CMPXCHG16B on x86-64) in some of my software, specifically for implementing double-pointer CAS as part of a wait-free disjoint set algorithm.
32 bit systems? Posted Sep 12, 2013 13:12 UTC (Thu) by farnz (guest, #17727) [Link] On x86, CMPXCHG8B is 8 bytes (64-bits), and is present since the Pentium (it's the instruction involved in the F0 0F bug). On other platforms, LL/SC can usually be used to emulate a double-pointer compare and swap.
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