https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66842
Richard Henderson <rth at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |rth at gcc dot gnu.org
Severity|normal |enhancement
--- Comment #5 from Richard Henderson <rth at gcc dot gnu.org> ---
When libatomic was first written, it wasn't clear what the restrictions
from the various languages would be, nor even if that was the best of
ideas -- things that would Just Work lock-free would fail on other,
less popular platforms.
Thus libatomic is written such that accesses to the same object, via
different aliased pages, will work. Thus locks are created on a per-
cacheline basis covering one page.
This does lead to inefficiencies wrt a more straight-forward solution,
but very careful thought needs to go into changing it.
