// 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, // 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 sucessCallback per second. tickCount++ if tickCount >= 10 { tickCount = 0 successCallback() } } }