blob: c7bf7a827a81ceefbf31ff74aef6c51103c7f92e [file] [log] [blame]
David K. Bainbridgebd6b2882021-08-26 13:31:02 +00001// Copyright (c) 2020 Uber Technologies, Inc.
2//
3// Permission is hereby granted, free of charge, to any person obtaining a copy
4// of this software and associated documentation files (the "Software"), to deal
5// in the Software without restriction, including without limitation the rights
6// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
7// copies of the Software, and to permit persons to whom the Software is
8// furnished to do so, subject to the following conditions:
9//
10// The above copyright notice and this permission notice shall be included in
11// all copies or substantial portions of the Software.
12//
13// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
18// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
19// THE SOFTWARE.
20
21package atomic
22
23import (
24 "strconv"
25)
26
27//go:generate bin/gen-atomicwrapper -name=Bool -type=bool -wrapped=Uint32 -pack=boolToInt -unpack=truthy -cas -swap -json -file=bool.go
28
29func truthy(n uint32) bool {
30 return n == 1
31}
32
33func boolToInt(b bool) uint32 {
34 if b {
35 return 1
36 }
37 return 0
38}
39
40// Toggle atomically negates the Boolean and returns the previous value.
41func (b *Bool) Toggle() bool {
42 for {
43 old := b.Load()
44 if b.CAS(old, !old) {
45 return old
46 }
47 }
48}
49
50// String encodes the wrapped value as a string.
51func (b *Bool) String() string {
52 return strconv.FormatBool(b.Load())
53}