Interesting: my proposal appears to be indeed a generalization of the greenlet
approach.
Specifically, while the greenlet proposal seems to only use one large stack per
native thread, I'm suggesting to use multiple large stacks that can be stolen
by other threads, which does mitigate the issues stemming from non-position
dependent stacks (they are not eliminated, but they have low probability of
happening).
It's also indeed possible to fully eliminate those issues by autoboxing
everything whose address is taken, but that would have a potentially large
performance impact on non-blocking code, while merely copying the stack only
imposes a performance penalty to code that blocks.
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