1// run
2
3// Copyright 2011 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
7// Test that goroutines and garbage collection run during init.
8
9package main
10
11import "runtime"
12
13var x []byte
14
15func init() {
16	c := make(chan int)
17	go send(c)
18	<-c
19
20	const chunk = 1 << 20
21	memstats := new(runtime.MemStats)
22	runtime.ReadMemStats(memstats)
23	sys := memstats.Sys
24	b := make([]byte, chunk)
25	for i := range b {
26		b[i] = byte(i%10 + '0')
27	}
28	s := string(b)
29	for i := 0; i < 1000; i++ {
30		x = []byte(s)
31	}
32	runtime.ReadMemStats(memstats)
33	sys1 := memstats.Sys
34	if sys1-sys > chunk*50 {
35		println("allocated 1000 chunks of", chunk, "and used ", sys1-sys, "memory")
36		panic("init1")
37	}
38}
39
40func send(c chan int) {
41	c <- 1
42}
43
44func main() {
45}
46