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syncmap: use type alias for Map

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sync.Map was introduced in Go 1.9, this change updates the syncmap package to use a type alias
to sync.Map for 1.9 and later. It also updates the comments to reflect this change.

Fixes golang/go#33867

Change-Id: Ia58ad2bc409f8fcb8a7539ef165148315da5cfb1
Reviewed-on: https://go-review.googlesource.com/c/sync/+/192737
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Eric Rutherford 2019-08-30 18:09:31 -05:00 • committed by Bryan C. Mills
commit cd5d95a43a
3 changed files with 390 additions and 367 deletions
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17
syncmap/go19.go Normal file
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@ -0,0 +1,17 @@
// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build go1.9
package syncmap
import "sync" // home to the standard library's sync.map implementation as of Go 1.9
// Map is a concurrent map with amortized-constant-time loads, stores, and deletes.
// It is safe for multiple goroutines to call a Map's methods concurrently.
//
// The zero Map is valid and empty.
//
// A Map must not be copied after first use.
type Map = sync.Map