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// 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.
package main
import (
"runtime"
"sync"
"sync/atomic"
"time"
)
const N = 10
var count int64
func run() error {
f1 := func() {}
f2 := func() {
func() {
f1()
}()
}
runtime.SetFinalizer(&f1, func(f *func()) {
atomic.AddInt64(&count, -1)
})
go f2()
return nil
}
func main() {
// Does not work on 32-bits, or with gccgo, due to partially
// conservative GC.
// Try to enable when we have fully precise GC.
if runtime.GOARCH != "amd64" || runtime.Compiler == "gccgo" {
return
}
count = N
var wg sync.WaitGroup
wg.Add(N)
for i := 0; i < N; i++ {
go func() {
run()
wg.Done()
}()
}
wg.Wait()
for i := 0; i < 2*N; 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")
}
}
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