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unique: clarify concurrent use of Make and Handle.Value

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Fixes #69637.

Change-Id: Ie612b4df50f42f2786b22fb7a756949530f9178e
Reviewed-on: https://go-review.googlesource.com/c/go/+/616235
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
This commit is contained in:
Michael Anthony Knyszek 2024-09-26 19:44:00 +00:00 committed by Gopher Robot
parent 1596a6c8ec
commit b7e4d2067c
1 changed files with 2 additions and 0 deletions
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src/unique/handle.go
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@ -25,12 +25,14 @@ type Handle[T comparable] struct {
} }
// Value returns a shallow copy of the T value that produced the Handle. // Value returns a shallow copy of the T value that produced the Handle.
// Value is safe for concurrent use by multiple goroutines.
func (h Handle[T]) Value() T { func (h Handle[T]) Value() T {
return *h.value return *h.value
} }
// Make returns a globally unique handle for a value of type T. Handles // Make returns a globally unique handle for a value of type T. Handles
// are equal if and only if the values used to produce them are equal. // are equal if and only if the values used to produce them are equal.
// Make is safe for concurrent use by multiple goroutines.
func Make[T comparable](value T) Handle[T] { func Make[T comparable](value T) Handle[T] {
// Find the map for type T. // Find the map for type T.
typ := abi.TypeFor[T]() typ := abi.TypeFor[T]()