util.go

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 rpc

import (
	"math/rand"
	"sync"
	"time"
)

var (
	seededIDGen = rand.New(rand.NewSource(time.Now().UnixNano()))
	// The golang rand generators are *not* intrinsically thread-safe.
	seededIDLock sync.Mutex
)

func randomID() uint64 {
	seededIDLock.Lock()
	defer seededIDLock.Unlock()
	return uint64(seededIDGen.Int63())
}