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[release-branch.go1.24] runtime: document that cleanups can run concurrently with each other 

For #71825.
Fixes #71955.

Change-Id: I25af19eb72d75f13cf661fc47ee5717782785326
Reviewed-on: https://go-review.googlesource.com/c/go/+/652637
Reviewed-by: Keith Randall <khr@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Keith Randall <khr@google.com>
This commit is contained in:
Michael Anthony Knyszek 2025-02-19 17:28:45 +00:00 committed by Gopher Robot
parent 45a52718e3
commit 0bfde51e0d
1 changed files with 4 additions and 2 deletions
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6
src/runtime/mcleanup.go
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@ -30,8 +30,10 @@ import (
// unreachable at the same time, their cleanups all become eligible to run
// and can run in any order. This is true even if the objects form a cycle.
//
// A single goroutine runs all cleanup calls for a program, sequentially. If a
// cleanup function must run for a long time, it should create a new goroutine.
// Cleanups run concurrently with any user-created goroutines.
// Cleanups may also run concurrently with one another (unlike finalizers).
// If a cleanup function must run for a long time, it should create a new goroutine
// to avoid blocking the execution of other cleanups.
//
// If ptr has both a cleanup and a finalizer, the cleanup will only run once
// it has been finalized and becomes unreachable without an associated finalizer.