mirror of
https://github.com/golang/go
synced 2024-11-26 17:07:09 -07:00
fd23958f49
fn can clearly hold a closure in memory. argp/pc point into stack and so can hold in memory a block that was previously a large stack serment. R=golang-dev, dave, rsc CC=golang-dev https://golang.org/cl/10784043
60 lines
1.0 KiB
Go
60 lines
1.0 KiB
Go
// run
|
|
|
|
// Copyright 2013 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.
|
|
|
|
// Test that defers do not prevent garbage collection.
|
|
|
|
package main
|
|
|
|
import (
|
|
"runtime"
|
|
"sync"
|
|
"sync/atomic"
|
|
"time"
|
|
)
|
|
|
|
var sink func()
|
|
|
|
func main() {
|
|
// Does not work on 32-bits due to partially conservative GC.
|
|
// Try to enable when we have fully precise GC.
|
|
if runtime.GOARCH != "amd64" {
|
|
return
|
|
}
|
|
N := 10
|
|
count := int32(N)
|
|
var wg sync.WaitGroup
|
|
wg.Add(N)
|
|
for i := 0; i < N; i++ {
|
|
go func() {
|
|
defer wg.Done()
|
|
v := new(int)
|
|
f := func() {
|
|
if *v != 0 {
|
|
panic("oops")
|
|
}
|
|
}
|
|
if *v != 0 {
|
|
// let the compiler think f escapes
|
|
sink = f
|
|
}
|
|
runtime.SetFinalizer(v, func(p *int) {
|
|
atomic.AddInt32(&count, -1)
|
|
})
|
|
defer f()
|
|
}()
|
|
}
|
|
wg.Wait()
|
|
for i := 0; i < 3; i++ {
|
|
time.Sleep(10 * time.Millisecond)
|
|
runtime.GC()
|
|
}
|
|
if count != 0 {
|
|
println(count, "out of", N, "finalizer are not called")
|
|
panic("not all finalizers are called")
|
|
}
|
|
}
|
|
|