Dynamic reads without locking.
kientzle at acm.org
Fri Oct 10 00:57:25 PDT 2003
Terry Lambert wrote:
> For certain uses, however, it's safe to not lock before the
> read *on Intel architectures*. This can go out the window on
> SPARC or PPC, or any architecture where there is no guarantee
> that there won't be speculative execution or out-of-order
> execution without explicit synchronization.
Even on Intel architectures, the compiler can and will reorder
operations. Hardware-level issues are only a part of the story.
I followed the Java Memory Model mailing lists for a while.
A lot of very bright, very experienced people thought they
had found ways to avoid locking and were wrong.
This stuff is hard. Do NOT underestimate it.
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