-
Notifications
You must be signed in to change notification settings - Fork 267
/
peertask_bitmap.go
72 lines (62 loc) · 1.41 KB
/
peertask_bitmap.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
/*
* Copyright 2020 The Dragonfly 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 peer
import (
"go.uber.org/atomic"
)
type Bitmap struct {
bits []byte
cap int32
settled atomic.Int32
}
func NewBitmap() *Bitmap {
return &Bitmap{
bits: make([]byte, 8),
cap: 8 * 8,
}
}
func NewBitmapWithCap(c int32) *Bitmap {
return &Bitmap{
bits: make([]byte, c),
cap: c * 8,
}
}
func (b *Bitmap) IsSet(i int32) bool {
if i >= b.cap {
return false
}
return b.bits[i/8]&(1<<uint(7-i%8)) != 0
}
func (b *Bitmap) Set(i int32) {
if i >= b.cap {
b.bits = append(b.bits, make([]byte, b.cap/8)...)
b.cap *= 2
}
b.settled.Inc()
b.bits[i/8] |= 1 << uint(7-i%8)
}
func (b *Bitmap) Clean(i int32) {
b.settled.Dec()
b.bits[i/8] ^= 1 << uint(7-i%8)
}
func (b *Bitmap) Settled() int32 {
return b.settled.Load()
}
func (b *Bitmap) Sets(xs ...int32) {
for _, x := range xs {
b.Set(x)
}
}