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91e56e6486
otherwise it fails spuriously with "newfunc allocated unexpectedly" message when run with GOMAXPROCS>1 (other goroutine allocates). R=golang-dev, dsymonds CC=golang-dev https://golang.org/cl/6347056
128 lines
1.7 KiB
Go
128 lines
1.7 KiB
Go
// run
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Test the behavior of closures.
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package main
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import "runtime"
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var c = make(chan int)
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func check(a []int) {
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for i := 0; i < len(a); i++ {
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n := <-c
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if n != a[i] {
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println("want", a[i], "got", n, "at", i)
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panic("fail")
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}
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}
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}
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func f() {
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var i, j int
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i = 1
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j = 2
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f := func() {
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c <- i
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i = 4
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g := func() {
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c <- i
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c <- j
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}
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g()
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c <- i
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}
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j = 5
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f()
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}
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// Accumulator generator
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func accum(n int) func(int) int {
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return func(i int) int {
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n += i
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return n
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}
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}
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func g(a, b func(int) int) {
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c <- a(2)
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c <- b(3)
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c <- a(4)
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c <- b(5)
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}
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func h() {
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var x8 byte = 100
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var x64 int64 = 200
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c <- int(x8)
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c <- int(x64)
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f := func(z int) {
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g := func() {
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c <- int(x8)
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c <- int(x64)
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c <- z
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}
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g()
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c <- int(x8)
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c <- int(x64)
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c <- int(z)
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}
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x8 = 101
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x64 = 201
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f(500)
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}
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func newfunc() func(int) int { return func(x int) int { return x } }
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func main() {
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runtime.GOMAXPROCS(1)
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var fail bool
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go f()
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check([]int{1, 4, 5, 4})
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a := accum(0)
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b := accum(1)
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go g(a, b)
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check([]int{2, 4, 6, 9})
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go h()
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check([]int{100, 200, 101, 201, 500, 101, 201, 500})
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memstats := new(runtime.MemStats)
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runtime.ReadMemStats(memstats)
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n0 := memstats.Mallocs
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x, y := newfunc(), newfunc()
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if x(1) != 1 || y(2) != 2 {
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println("newfunc returned broken funcs")
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fail = true
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}
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runtime.ReadMemStats(memstats)
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if n0 != memstats.Mallocs {
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println("newfunc allocated unexpectedly")
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fail = true
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}
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ff(1)
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if fail {
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panic("fail")
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}
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}
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func ff(x int) {
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call(func() {
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_ = x
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})
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}
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func call(func()) {
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}
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