K 10
svn:author
V 3
ian
K 8
svn:date
V 27
2014-08-01T22:28:36.316558Z
K 7
svn:log
V 442
Add 64-bit atomic ops for armv6.  The only safe way to access a 64-bit
value shared across multiple cores is with atomic_load_64() and
atomic_store_64(), because the normal 64-bit load/store instructions
are not atomic on 32-bit arm.  Luckily the ldrexd/strexd instructions
that are atomic are fairly cheap on armv6.  Because it's fairly simple
to do, this implements all the ops for 64-bit, not just load/store.

Reviewed by:	andrew, cognet

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