task: clarify task ID reuse guarantees#7577
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Thanks for the review comments, I'll start revising. Edit: Oh no, Github added the loom labels again 😄 Is there a way I can avoid that? |
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Fixes: #7553
As discussed in the above issue, we have an implicit guarantee that a task ID is not reused until both the task finishes and its
JoinHandleis joined on or dropped. User code requires this guarantee to do useful things with the ID, so this PR updates docs to make it more explicit.I chose the wording "joined on" to cover cases outside of plain
.await. In particular, joining a task via&mut JoinHandle(e.g.tokio::select!) counts for all intents and purposes, despite not strictly consuming theJoinHandle.