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The __atomic primitives have been available since GCC 4.7 and provide a richer interface for describing memory ordering requirements. As a bonus by using the primitives instead of hand-rolled functions we can use tools such as the ThreadSanitizer which need the use of well defined APIs for its analysis. If we have __ATOMIC defines we exclusively use the __atomic primitives for all our atomic access. Otherwise we fall back to the mixture of __sync and hand-rolled barrier cases. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <1453976119-24372-4-git-send-email-alex.bennee@linaro.org> [Use __ATOMIC_SEQ_CST for atomic_mb_read/atomic_mb_set on !POWER. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> |
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