mirror of
https://github.com/golang/go
synced 2024-09-06 00:19:45 +00:00
![Cuong Manh Le](/assets/img/avatar_default.png)
Fixes #45045 Change-Id: Ifcc7bd31591870446ce3e5127489a0b887d413f1 Reviewed-on: https://go-review.googlesource.com/c/go/+/305089 Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com> Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org>
52 lines
997 B
Go
52 lines
997 B
Go
// run
|
|
|
|
// Copyright 2021 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package main
|
|
|
|
import (
|
|
"reflect"
|
|
"runtime"
|
|
"unsafe"
|
|
)
|
|
|
|
func k(c chan string, val string) string {
|
|
b := make([]byte, 1000)
|
|
runtime.SetFinalizer(&b[0], func(*byte) {
|
|
c <- val
|
|
})
|
|
var s string
|
|
h := (*reflect.StringHeader)(unsafe.Pointer(&s))
|
|
h.Data = uintptr(unsafe.Pointer(&b[0]))
|
|
h.Len = len(b)
|
|
return s
|
|
}
|
|
|
|
func main() {
|
|
{
|
|
c := make(chan string, 2)
|
|
m := make(map[string]int)
|
|
m[k(c, "first")] = 0
|
|
m[k(c, "second")] = 0
|
|
runtime.GC()
|
|
if s := <-c; s != "first" {
|
|
panic("map[string], second key did not retain.")
|
|
}
|
|
runtime.KeepAlive(m)
|
|
}
|
|
|
|
{
|
|
c := make(chan string, 2)
|
|
m := make(map[[2]string]int)
|
|
m[[2]string{k(c, "first")}] = 0
|
|
m[[2]string{k(c, "second")}] = 0
|
|
runtime.GC()
|
|
if s := <-c; s != "first" {
|
|
panic("map[[2]string], second key did not retain.")
|
|
}
|
|
runtime.KeepAlive(m)
|
|
}
|
|
}
|