Naveen Sampath | 04696f7 | 2022-06-13 15:19:14 +0530 | [diff] [blame^] | 1 | // 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 | |
| 21 | package atomic |
| 22 | |
| 23 | import ( |
| 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 | |
| 29 | func truthy(n uint32) bool { |
| 30 | return n == 1 |
| 31 | } |
| 32 | |
| 33 | func 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. |
| 41 | func (b *Bool) Toggle() (old 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. |
| 51 | func (b *Bool) String() string { |
| 52 | return strconv.FormatBool(b.Load()) |
| 53 | } |