gcc/testsuite/go.test/test/init1.go

   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
   9 package main
  10
  11 import "runtime"
  12
  13 var x []byte
  14
  15 func 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
  40 func send(c chan int) {
  41         c <- 1
  42 }
  43
  44 func main() {
  45 }