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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
import (
"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 uint64
seed += uint64(ExpFloat64())
seed += uint64(Float32())
seed += uint64(Float64())
seed += uint64(Intn(Int()))
seed += uint64(Int31n(Int31()))
seed += uint64(Int63n(Int63()))
seed += uint64(NormFloat64())
seed += uint64(Uint32())
seed += uint64(Uint64())
for _, p := range Perm(10) {
seed += uint64(p)
}
Read(buf)
for _, b := range buf {
seed += uint64(b)
}
Seed(uint64(i*j) * seed)
}
}(i)
}
}
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