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// Copyright 2021 ByteDance Inc.
//
// 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 skipset
import "sync/atomic"
const (
fullyLinked = 1 << iota
marked
)
type bitflag struct {
data uint32
}
func (f *bitflag) SetTrue(flags uint32) {
for {
old := atomic.LoadUint32(&f.data)
if old&flags != flags {
// Flag is 0, need set it to 1.
n := old | flags
if !atomic.CompareAndSwapUint32(&f.data, old, n) {
continue
}
}
return
}
}
func (f *bitflag) SetFalse(flags uint32) {
for {
old := atomic.LoadUint32(&f.data)
check := old & flags
if check != 0 {
// Flag is 1, need set it to 0.
n := old ^ check
if !atomic.CompareAndSwapUint32(&f.data, old, n) {
continue
}
}
return
}
}
func (f *bitflag) Get(flag uint32) bool {
return (atomic.LoadUint32(&f.data) & flag) != 0
}
func (f *bitflag) MGet(check, expect uint32) bool {
return (atomic.LoadUint32(&f.data) & check) == expect
}
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