1// Copyright 2016 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5package race_test
6
7import (
8	"sync"
9	"testing"
10	"time"
11)
12
13func TestRacePool(t *testing.T) {
14	// Pool randomly drops the argument on the floor during Put.
15	// Repeat so that at least one iteration gets reuse.
16	for i := 0; i < 10; i++ {
17		c := make(chan int)
18		p := &sync.Pool{New: func() any { return make([]byte, 10) }}
19		x := p.Get().([]byte)
20		x[0] = 1
21		p.Put(x)
22		go func() {
23			y := p.Get().([]byte)
24			y[0] = 2
25			c <- 1
26		}()
27		x[0] = 3
28		<-c
29	}
30}
31
32func TestNoRacePool(t *testing.T) {
33	for i := 0; i < 10; i++ {
34		p := &sync.Pool{New: func() any { return make([]byte, 10) }}
35		x := p.Get().([]byte)
36		x[0] = 1
37		p.Put(x)
38		go func() {
39			y := p.Get().([]byte)
40			y[0] = 2
41			p.Put(y)
42		}()
43		time.Sleep(100 * time.Millisecond)
44		x = p.Get().([]byte)
45		x[0] = 3
46	}
47}
48