time: remove Box from Sleep
#3278
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Removes the box from `Sleep`, taking advantage of intrusive wakers. The `Sleep` future is now `!Unpin`. Closes #3267
bdonlan
reviewed
Dec 16, 2020
| @@ -317,15 +317,15 @@ async fn drop_after_reschedule_at_new_scheduled_time() { | |||
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We should have a test that asserts that Sleep is !Unpin (same for other types that contain pinned Sleeps).
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Such a test can easily be constructed using the macros in tokio/tokio/tests/async_send_sync.rs.
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Removes the box from
Sleep, taking advantage of intrusive wakers. TheSleepfuture is now!Unpin.Intervalboxes theSleepinternally. The box is reused across polls which amortized the allocation. It makes the type a bit easier to use. Implementing an allocation-freeIntervalis fairly trivial usingasync-streamand callingsleep().Most of the PR is updating code to handle
!Unpinsleep.Closes #3267