Blocking primitives cannot participate in safepoints #288
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Adapt all known blocking primitives to unregister before, and reregister after a safepoint.
@daumayr could you have a look and see whether this fixes your issues?
We don't have benchmarks evaluating this change, so, I think, correctness is key, and if performance becomes an issue, we need to find more specific strategies, or optimizations for special cases.