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