| // 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") |
| } |
| } |
| |
