Use async for the instance's wait method #885
Merged
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This PR changes the
Instance
's wait method to be async.This is a step towards migrating to an async shim.
This has the nice benefit that we get sync probing (
try_wait
) and timed wait (wait_timeout
) for free.We get probing through
FutureExt::now_or_never
, and timed wait throughtokio::time::timeout
.This also simplifies the implementation of
WaitableCell
a fair bit.