55 lines
1.3 KiB
Go
55 lines
1.3 KiB
Go
/*
|
|
Copyright 2018 The Containerd Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package atomic
|
|
|
|
import "sync/atomic"
|
|
|
|
// Bool is an atomic Boolean,
|
|
// Its methods are all atomic, thus safe to be called by
|
|
// multiple goroutines simultaneously.
|
|
type Bool interface {
|
|
Set()
|
|
Unset()
|
|
IsSet() bool
|
|
}
|
|
|
|
// NewBool creates an Bool with given default value
|
|
func NewBool(ok bool) Bool {
|
|
ab := new(atomicBool)
|
|
if ok {
|
|
ab.Set()
|
|
}
|
|
return ab
|
|
}
|
|
|
|
type atomicBool int32
|
|
|
|
// Set sets the Boolean to true
|
|
func (ab *atomicBool) Set() {
|
|
atomic.StoreInt32((*int32)(ab), 1)
|
|
}
|
|
|
|
// Unset sets the Boolean to false
|
|
func (ab *atomicBool) Unset() {
|
|
atomic.StoreInt32((*int32)(ab), 0)
|
|
}
|
|
|
|
// IsSet returns whether the Boolean is true
|
|
func (ab *atomicBool) IsSet() bool {
|
|
return atomic.LoadInt32((*int32)(ab)) == 1
|
|
}
|