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// // Copyright 2016 The Go Authors. All rights reserved.
// // Use of this source code is governed by a BSD-style
// // license that can be found in the LICENSE file.
// package rand_test
// import (
// . "math/rand"
// "sync"
// "testing"
// )
// // TestConcurrent exercises the rand API concurrently, triggering situations
// // where the race detector is likely to detect issues.
// func TestConcurrent(t *testing.T) {
// const (
// numRoutines = 10
// numCycles = 10
// )
// var wg sync.WaitGroup
// defer wg.Wait()
// wg.Add(numRoutines)
// for i := 0; i < numRoutines; i++ {
// go func(i int) {
// defer wg.Done()
// buf := make([]byte, 997)
// for j := 0; j < numCycles; j++ {
// var seed int64
// seed += int64(ExpFloat64())
// seed += int64(Float32())
// seed += int64(Float64())
// seed += int64(Intn(Int()))
// seed += int64(Int31n(Int31()))
// seed += int64(Int63n(Int63()))
// seed += int64(norm_float64())
// seed += int64(Uint32())
// seed += int64(Uint64())
// for _, p := range Perm(10) {
// seed += int64(p)
// }
// Read(buf)
// for _, b := range buf {
// seed += int64(b)
// }
// Seed(int64(i*j) * seed)
// }
// }(i)
// }
// }