From: Matt Corallo <git@bluematt.me>
Date: Tue, 13 Feb 2024 22:08:55 +0000 (+0000)
Subject: Give `Future`s for a `FutureState` an idx and track `StdWaker` idxn
X-Git-Tag: v0.0.123-beta~64^2~1
X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=commitdiff_plain;ds=sidebyside;h=5f404b9d0a0a160aa305b5a9421026e58c7ef609;hp=5f404b9d0a0a160aa305b5a9421026e58c7ef609;p=rust-lightning

Give `Future`s for a `FutureState` an idx and track `StdWaker` idxn

When an `std::future::Future` is `poll()`ed, we're only supposed to
use the latest `Waker` provided. However, we currently push an
`StdWaker` onto our callback list every time `poll` is called,
waking every `Waker` but also using more and more memory until the
`Future` itself is woken.

Here we take a step towards fixing this by giving each `Future` a
unique index and storing which `Future` an `StdWaker` came from in
the callback list. This sets us up to deduplicate `StdWaker`s by
`Future`s in the next commit.
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