queues = list(self._watch_queues)
We can’t reuse instances between calls to the same function, because then the function could do impure things like maintain a global counter. We do use Wasmtime’s pre-instantiation feature to parse and compile Wasm modules only once per Nix process.
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Author(s): Przemysław Szatan, Maria Sywanycz, Szymon Winczewski
to ask an entirely different question: Why don't we have deadlocks like these