-
Notifications
You must be signed in to change notification settings - Fork 1
/
sequence.go
42 lines (34 loc) · 1.3 KB
/
sequence.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
// Copyright (c) 2014 Dataence, LLC. All rights reserved.
//
// 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 ringbuffer2
import "sync/atomic"
// To avoid false sharing, e.g., having the same sequence variables in the same cache line,
// we will make each sequence 64 bytes, which is the most common cache line size.
type sequence struct {
// The current position of the producer or consumer
cursor,
// The previous known position of the consumer (if producer) or producer (if consumer)
gate,
// These are fillers to pad the cache line, which is generally 64 bytes
p2, p3, p4, p5, p6, p7 int64
}
func newSequence() *sequence {
return &sequence{}
}
func (this *sequence) get() int64 {
return atomic.LoadInt64(&this.cursor)
}
func (this *sequence) set(seq int64) {
atomic.StoreInt64(&this.cursor, seq)
}