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https://github.com/golang/go
synced 2024-11-22 03:34:40 -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
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// Copyright 2013 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 that defers do not prevent garbage collection.
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package main
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import (
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"runtime"
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"sync"
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"sync/atomic"
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"time"
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)
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var sink func()
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func main() {
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// Does not work on 32-bits due to partially conservative GC.
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// Try to enable when we have fully precise GC.
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if runtime.GOARCH != "amd64" {
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return
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}
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N := 10
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count := int32(N)
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var wg sync.WaitGroup
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wg.Add(N)
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for i := 0; i < N; i++ {
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go func() {
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defer wg.Done()
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v := new(int)
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f := func() {
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if *v != 0 {
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panic("oops")
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}
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}
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if *v != 0 {
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// let the compiler think f escapes
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sink = f
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}
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runtime.SetFinalizer(v, func(p *int) {
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atomic.AddInt32(&count, -1)
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})
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defer f()
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}()
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}
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wg.Wait()
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for i := 0; i < 3; i++ {
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time.Sleep(10 * time.Millisecond)
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runtime.GC()
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}
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if count != 0 {
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println(count, "out of", N, "finalizer are not called")
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panic("not all finalizers are called")
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}
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}
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