173 lines
3.4 KiB
Go
173 lines
3.4 KiB
Go
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package refs
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import (
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"reflect"
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"sync"
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"testing"
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)
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type testCounter struct {
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AtomicRefCount
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// mu protects the boolean below.
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mu sync.Mutex
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// destroyed indicates whether this was destroyed.
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destroyed bool
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}
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func (t *testCounter) DecRef() {
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t.AtomicRefCount.DecRefWithDestructor(t.destroy)
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}
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func (t *testCounter) destroy() {
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t.mu.Lock()
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defer t.mu.Unlock()
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t.destroyed = true
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}
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func (t *testCounter) IsDestroyed() bool {
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t.mu.Lock()
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defer t.mu.Unlock()
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return t.destroyed
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}
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func newTestCounter() *testCounter {
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return &testCounter{destroyed: false}
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}
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func TestOneRef(t *testing.T) {
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tc := newTestCounter()
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tc.DecRef()
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if !tc.IsDestroyed() {
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t.Errorf("object should have been destroyed")
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}
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}
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func TestTwoRefs(t *testing.T) {
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tc := newTestCounter()
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tc.IncRef()
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tc.DecRef()
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tc.DecRef()
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if !tc.IsDestroyed() {
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t.Errorf("object should have been destroyed")
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}
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}
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func TestMultiRefs(t *testing.T) {
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tc := newTestCounter()
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tc.IncRef()
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tc.DecRef()
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tc.IncRef()
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tc.DecRef()
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tc.DecRef()
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if !tc.IsDestroyed() {
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t.Errorf("object should have been destroyed")
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}
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}
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func TestWeakRef(t *testing.T) {
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tc := newTestCounter()
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w := NewWeakRef(tc, nil)
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// Try resolving.
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if x := w.Get(); x == nil {
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t.Errorf("weak reference didn't resolve: expected %v, got nil", tc)
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} else {
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x.DecRef()
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}
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// Try resolving again.
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if x := w.Get(); x == nil {
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t.Errorf("weak reference didn't resolve: expected %v, got nil", tc)
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} else {
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x.DecRef()
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}
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// Shouldn't be destroyed yet. (Can't continue if this fails.)
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if tc.IsDestroyed() {
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t.Fatalf("original object destroyed earlier than expected")
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}
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// Drop the original reference.
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tc.DecRef()
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// Assert destroyed.
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if !tc.IsDestroyed() {
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t.Errorf("original object not destroyed as expected")
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}
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// Shouldn't be anything.
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if x := w.Get(); x != nil {
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t.Errorf("weak reference resolved: expected nil, got %v", x)
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}
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}
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func TestWeakRefDrop(t *testing.T) {
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tc := newTestCounter()
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w := NewWeakRef(tc, nil)
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w.Drop()
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// Just assert the list is empty.
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if !tc.weakRefs.Empty() {
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t.Errorf("weak reference not dropped")
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}
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// Drop the original reference.
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tc.DecRef()
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}
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type testWeakRefUser struct {
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weakRefGone func()
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}
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func (u *testWeakRefUser) WeakRefGone() {
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u.weakRefGone()
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}
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func TestCallback(t *testing.T) {
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called := false
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tc := newTestCounter()
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var w *WeakRef
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w = NewWeakRef(tc, &testWeakRefUser{func() {
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called = true
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// Check that the weak ref has been zapped.
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rc := w.obj.Load().(RefCounter)
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if v := reflect.ValueOf(rc); v != reflect.Zero(v.Type()) {
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t.Fatalf("Callback called with non-nil ptr")
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}
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// Check that we're not holding the mutex by acquiring and
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// releasing it.
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tc.mu.Lock()
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tc.mu.Unlock()
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}})
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// Drop the original reference, this must trigger the callback.
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tc.DecRef()
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if !called {
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t.Fatalf("Callback not called")
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}
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}
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