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 } 54