1// run
2
3// Copyright 2016 The Go Authors. All rights reserved.
4// Use of this source code is governed by a BSD-style
5// license that can be found in the LICENSE file.
6
7package main
8
9import (
10	"runtime"
11	"time"
12)
13
14type T struct{}
15
16func (*T) Foo(vals []interface{}) {
17	switch v := vals[0].(type) {
18	case string:
19		_ = v
20	}
21}
22
23type R struct{ *T }
24
25type Q interface {
26	Foo([]interface{})
27}
28
29func main() {
30	var count = 10000
31	if runtime.Compiler == "gccgo" {
32		// On targets without split-stack libgo allocates
33		// a large stack for each goroutine. On 32-bit
34		// systems this test can run out of memory.
35		const intSize = 32 << (^uint(0) >> 63) // 32 or 64
36		if intSize < 64 {
37			count = 100
38		}
39	}
40
41	var q Q = &R{&T{}}
42	for i := 0; i < count; i++ {
43		go func() {
44			defer q.Foo([]interface{}{"meow"})
45			time.Sleep(100 * time.Millisecond)
46		}()
47	}
48	time.Sleep(1 * time.Second)
49}
50