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-rw-r--r--test/deferfin.go58
1 files changed, 58 insertions, 0 deletions
diff --git a/test/deferfin.go b/test/deferfin.go
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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.
+
+// Test that defers do not prevent garbage collection.
+
+package main
+
+import (
+ "runtime"
+ "sync"
+ "sync/atomic"
+ "time"
+)
+
+var sink func()
+
+func main() {
+ // Does not work with gccgo, due to partially conservative GC.
+ // Try to enable when we have fully precise GC.
+ if runtime.Compiler == "gccgo" {
+ 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(string)
+ f := func() {
+ if *v != "" {
+ panic("oops")
+ }
+ }
+ if *v != "" {
+ // let the compiler think f escapes
+ sink = f
+ }
+ runtime.SetFinalizer(v, func(p *string) {
+ 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")
+ }
+}