mirror of
https://github.com/golang/go
synced 2024-11-24 09:00:13 -07:00
49 lines
763 B
Go
49 lines
763 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 "runtime"
|
||
|
|
|
||
|
|
type T [4]int
|
||
|
|
|
||
|
|
//go:noinline
|
||
|
|
func g(x []*T) ([]*T, []*T) { return x, x }
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
const Jenny = 8675309
|
||
|
|
s := [10]*T{{Jenny}}
|
||
|
|
|
||
|
|
done := make(chan struct{})
|
||
|
|
runtime.SetFinalizer(s[0], func(p *T) { close(done) })
|
||
|
|
|
||
|
|
var h, _ interface{} = g(s[:])
|
||
|
|
|
||
|
|
if wait(done) {
|
||
|
|
panic("GC'd early")
|
||
|
|
}
|
||
|
|
|
||
|
|
if h.([]*T)[0][0] != Jenny {
|
||
|
|
panic("lost Jenny's number")
|
||
|
|
}
|
||
|
|
|
||
|
|
if !wait(done) {
|
||
|
|
panic("never GC'd")
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func wait(done <-chan struct{}) bool {
|
||
|
|
for i := 0; i < 10; i++ {
|
||
|
|
runtime.GC()
|
||
|
|
select {
|
||
|
|
case <-done:
|
||
|
|
return true
|
||
|
|
default:
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return false
|
||
|
|
}
|