}
}

func BenchmarkRead1000(b *testing.B) {
	r := New(NewSource(1))
	buf := make([]byte, 1000)
	b.ResetTimer()
	for n := b.N; n > 0; n-- {
		r.Read(buf)
	}
}

func BenchmarkConcurrent(b *testing.B) {
	const goroutines = 4
	var wg sync.WaitGroup
	wg.Add(goroutines)
	for i := 0; i < goroutines; i++ {
		go func() {
			defer wg.Done()
			for n := b.N; n > 0; n-- {
				Int63()

	r := testRand()
	for n := b.N; n > 0; n-- {
		r.Shuffle(30, func(i, j int) {
			if i < 0 || i >= 30 || j < 0 || j >= 30 {
				b.Fatalf("bad swap(%d, %d)", i, j)
			}
		})
	}
}

func BenchmarkConcurrent(b *testing.B) {
	const goroutines = 4
	var wg sync.WaitGroup
	wg.Add(goroutines)
	for i := 0; i < goroutines; i++ {
		go func() {
			defer wg.Done()
			for n := b.N; n > 0; n-- {
				Int64()