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