blob: 200b115ca209ed7797628e3f068a647af97e7b10 [file] [log] [blame]
Matteo Scandoloa6a3aee2019-11-26 13:30:14 -07001/*
2 *
3 * Copyright 2018 gRPC authors.
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 */
18
19// Package grpcrand implements math/rand functions in a concurrent-safe way
20// with a global random source, independent of math/rand's global source.
21package grpcrand
22
23import (
24 "math/rand"
25 "sync"
26 "time"
27)
28
29var (
30 r = rand.New(rand.NewSource(time.Now().UnixNano()))
31 mu sync.Mutex
32)
33
34// Int63n implements rand.Int63n on the grpcrand global source.
35func Int63n(n int64) int64 {
36 mu.Lock()
37 res := r.Int63n(n)
38 mu.Unlock()
39 return res
40}
41
42// Intn implements rand.Intn on the grpcrand global source.
43func Intn(n int) int {
44 mu.Lock()
45 res := r.Intn(n)
46 mu.Unlock()
47 return res
48}
49
50// Float64 implements rand.Float64 on the grpcrand global source.
51func Float64() float64 {
52 mu.Lock()
53 res := r.Float64()
54 mu.Unlock()
55 return res
56}