Indeed, I very nearly implemented such a thing as part of the patch
I sent out. However, it didn't look trivial enough to implement so
I backed off. The blocked state needs to be saved restored at
various points: when starting a finalizer, when invoking a
foreign-exported function,
Also, this is a nested call to eval(), in a primitive, which can
invoke an IO action and therefore re-enter Haskell without going
through unsafePerformIO. Is that safe?
Yes, I think so. Most calls to IO actions from primitives are safe
and I believe these ones are too. (In some ways,
So, are we now claiming that my patch *is* safe? (Never mind about
IORefs, I'm talking about the implementation itself).
No.
And my recent focus on IORefs has simply been because they seemed the
strongest argument.
A
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