atomics: update documentation

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Some of the constraints on operand sizes have been relaxed, so adjust the
documentation.

Deprecate atomic_mb_read and atomic_mb_set; it is not really possible to
use them correctly because they do not interoperate with sequentially-consistent
RMW operations.

Finally, extend the memory barrier pairing section to cover acquire and
release semantics in general, roughly based on the KVM Forum 2016 talk,
"<atomic.h> weapons".

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Paolo Bonzini

2020-04-13 02:56:03 -04:00

parent 15e8699f00

commit de99dab06f

1 changed files with 246 additions and 185 deletions

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docs/devel/atomics.rst

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