tidb systime_mon 代码
文件路径：/util/systimemon/systime_mon.go
/ Copyright 2017 PingCAP, 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 systimemon
import (
"time"
"github.com/pingcap/tidb/util/logutil"
"go.uber.org/zap"
)
/ StartMonitor calls systimeErrHandler if system time jump backward.
func StartMonitor(now func() time.Time, systimeErrHandler func(), successCallback func()) {
logutil.BgLogger().Info("start system time monitor")
tick := time.NewTicker(100 * time.Millisecond)
defer tick.Stop()
tickCount := 0
for {
last := now().UnixNano()
<-tick.C
if now().UnixNano() < last {
logutil.BgLogger().Error("system time jump backward", zap.Int64("last", last))
systimeErrHandler()
}
/ call successCallback per second.
tickCount++
if tickCount >= 10 {
tickCount = 0
successCallback()
}
}
}