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101 lines
2.3 KiB
Go
101 lines
2.3 KiB
Go
//go:build !go1.21
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// TODO: when this file is deleted (after Go 1.20 support is dropped), delete
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// all of grpcrand and call the rand package directly.
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/*
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*
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* Copyright 2018 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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// Package grpcrand implements math/rand functions in a concurrent-safe way
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// with a global random source, independent of math/rand's global source.
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package grpcrand
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import (
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"math/rand"
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"sync"
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"time"
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)
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var (
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r = rand.New(rand.NewSource(time.Now().UnixNano()))
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mu sync.Mutex
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)
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// Int implements rand.Int on the grpcrand global source.
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func Int() int {
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mu.Lock()
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defer mu.Unlock()
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return r.Int()
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}
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// Int63n implements rand.Int63n on the grpcrand global source.
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func Int63n(n int64) int64 {
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mu.Lock()
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defer mu.Unlock()
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return r.Int63n(n)
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}
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// Intn implements rand.Intn on the grpcrand global source.
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func Intn(n int) int {
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mu.Lock()
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defer mu.Unlock()
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return r.Intn(n)
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}
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// Int31n implements rand.Int31n on the grpcrand global source.
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func Int31n(n int32) int32 {
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mu.Lock()
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defer mu.Unlock()
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return r.Int31n(n)
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}
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// Float64 implements rand.Float64 on the grpcrand global source.
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func Float64() float64 {
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mu.Lock()
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defer mu.Unlock()
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return r.Float64()
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}
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// Uint64 implements rand.Uint64 on the grpcrand global source.
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func Uint64() uint64 {
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mu.Lock()
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defer mu.Unlock()
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return r.Uint64()
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}
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// Uint32 implements rand.Uint32 on the grpcrand global source.
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func Uint32() uint32 {
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mu.Lock()
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defer mu.Unlock()
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return r.Uint32()
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}
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// ExpFloat64 implements rand.ExpFloat64 on the grpcrand global source.
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func ExpFloat64() float64 {
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mu.Lock()
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defer mu.Unlock()
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return r.ExpFloat64()
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}
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// Shuffle implements rand.Shuffle on the grpcrand global source.
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var Shuffle = func(n int, f func(int, int)) {
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mu.Lock()
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defer mu.Unlock()
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r.Shuffle(n, f)
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}
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