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1 | /* |
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. | |
21 | package grpcrand | |
22 | ||
23 | import ( | |
24 | "math/rand" | |
25 | "sync" | |
26 | "time" | |
27 | ) | |
28 | ||
29 | var ( | |
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. | |
35 | func 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. | |
43 | func 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. | |
51 | func Float64() float64 { | |
52 | mu.Lock() | |
53 | res := r.Float64() | |
54 | mu.Unlock() | |
55 | return res | |
56 | } |