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khenaidoo59ce9dd2019-11-11 13:05:32 -05001// Copyright 2015 The etcd Authors
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7// http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15package etcdserver
16
17import (
18 "sync/atomic"
19)
20
21// consistentIndex represents the offset of an entry in a consistent replica log.
22// It implements the mvcc.ConsistentIndexGetter interface.
23// It is always set to the offset of current entry before executing the entry,
24// so ConsistentWatchableKV could get the consistent index from it.
25type consistentIndex uint64
26
27func (i *consistentIndex) setConsistentIndex(v uint64) {
28 atomic.StoreUint64((*uint64)(i), v)
29}
30
31func (i *consistentIndex) ConsistentIndex() uint64 {
32 return atomic.LoadUint64((*uint64)(i))
33}