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// Copyright 2011 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 runtime_test
import (
"runtime"
"sync"
"sync/atomic"
"testing"
"time"
)
type Tintptr *int // assignable to *int
type Tint int // *Tint implements Tinter, interface{}
func (t *Tint) m() {}
type Tinter interface {
m()
}
func TestFinalizerType(t *testing.T) {
if runtime.GOARCH != "amd64" {
t.Skipf("Skipping on non-amd64 machine")
}
ch := make(chan bool, 10)
finalize := func(x *int) {
if *x != 97531 {
t.Errorf("finalizer %d, want %d", *x, 97531)
}
ch <- true
}
var finalizerTests = []struct {
convert func(*int) interface{}
finalizer interface{}
}{
{func(x *int) interface{} { return x }, func(v *int) { finalize(v) }},
{func(x *int) interface{} { return Tintptr(x) }, func(v Tintptr) { finalize(v) }},
{func(x *int) interface{} { return Tintptr(x) }, func(v *int) { finalize(v) }},
{func(x *int) interface{} { return (*Tint)(x) }, func(v *Tint) { finalize((*int)(v)) }},
{func(x *int) interface{} { return (*Tint)(x) }, func(v Tinter) { finalize((*int)(v.(*Tint))) }},
}
for _, tt := range finalizerTests {
go func() {
v := new(int)
*v = 97531
runtime.SetFinalizer(tt.convert(v), tt.finalizer)
v = nil
}()
time.Sleep(1 * time.Second)
runtime.GC()
select {
case <-ch:
case <-time.After(time.Second * 4):
t.Errorf("finalizer for type %T didn't run", tt.finalizer)
}
}
}
type bigValue struct {
fill uint64
it bool
up string
}
func TestFinalizerInterfaceBig(t *testing.T) {
if runtime.GOARCH != "amd64" {
t.Skipf("Skipping on non-amd64 machine")
}
ch := make(chan bool)
go func() {
v := &bigValue{0xDEADBEEFDEADBEEF, true, "It matters not how strait the gate"}
old := *v
runtime.SetFinalizer(v, func(v interface{}) {
i, ok := v.(*bigValue)
if !ok {
t.Errorf("finalizer called with type %T, want *bigValue", v)
}
if *i != old {
t.Errorf("finalizer called with %+v, want %+v", *i, old)
}
close(ch)
})
v = nil
}()
time.Sleep(1 * time.Second)
runtime.GC()
select {
case <-ch:
case <-time.After(4 * time.Second):
t.Errorf("finalizer for type *bigValue didn't run")
}
}
func fin(v *int) {
}
func BenchmarkFinalizer(b *testing.B) {
const CallsPerSched = 1000
procs := runtime.GOMAXPROCS(-1)
N := int32(b.N / CallsPerSched)
var wg sync.WaitGroup
wg.Add(procs)
for p := 0; p < procs; p++ {
go func() {
var data [CallsPerSched]*int
for i := 0; i < CallsPerSched; i++ {
data[i] = new(int)
}
for atomic.AddInt32(&N, -1) >= 0 {
runtime.Gosched()
for i := 0; i < CallsPerSched; i++ {
runtime.SetFinalizer(data[i], fin)
}
for i := 0; i < CallsPerSched; i++ {
runtime.SetFinalizer(data[i], nil)
}
}
wg.Done()
}()
}
wg.Wait()
}
func BenchmarkFinalizerRun(b *testing.B) {
const CallsPerSched = 1000
procs := runtime.GOMAXPROCS(-1)
N := int32(b.N / CallsPerSched)
var wg sync.WaitGroup
wg.Add(procs)
for p := 0; p < procs; p++ {
go func() {
for atomic.AddInt32(&N, -1) >= 0 {
runtime.Gosched()
for i := 0; i < CallsPerSched; i++ {
v := new(int)
runtime.SetFinalizer(v, fin)
}
runtime.GC()
}
wg.Done()
}()
}
wg.Wait()
}
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