133 lines
3.3 KiB
Go
133 lines
3.3 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 seqatomic
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import (
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"sync/atomic"
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"testing"
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"time"
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"gvisor.dev/gvisor/pkg/sync"
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)
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func TestSeqAtomicLoadUncontended(t *testing.T) {
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var seq sync.SeqCount
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const want = 1
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data := want
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if got := SeqAtomicLoadInt(&seq, &data); got != want {
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t.Errorf("SeqAtomicLoadInt: got %v, wanted %v", got, want)
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}
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}
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func TestSeqAtomicLoadAfterWrite(t *testing.T) {
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var seq sync.SeqCount
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var data int
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const want = 1
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seq.BeginWrite()
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data = want
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seq.EndWrite()
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if got := SeqAtomicLoadInt(&seq, &data); got != want {
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t.Errorf("SeqAtomicLoadInt: got %v, wanted %v", got, want)
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}
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}
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func TestSeqAtomicLoadDuringWrite(t *testing.T) {
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var seq sync.SeqCount
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var data int
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const want = 1
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seq.BeginWrite()
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go func() {
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time.Sleep(time.Second)
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data = want
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seq.EndWrite()
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}()
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if got := SeqAtomicLoadInt(&seq, &data); got != want {
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t.Errorf("SeqAtomicLoadInt: got %v, wanted %v", got, want)
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}
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}
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func TestSeqAtomicTryLoadUncontended(t *testing.T) {
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var seq sync.SeqCount
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const want = 1
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data := want
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epoch := seq.BeginRead()
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if got, ok := SeqAtomicTryLoadInt(&seq, epoch, &data); !ok || got != want {
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t.Errorf("SeqAtomicTryLoadInt: got (%v, %v), wanted (%v, true)", got, ok, want)
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}
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}
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func TestSeqAtomicTryLoadDuringWrite(t *testing.T) {
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var seq sync.SeqCount
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var data int
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epoch := seq.BeginRead()
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seq.BeginWrite()
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if got, ok := SeqAtomicTryLoadInt(&seq, epoch, &data); ok {
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t.Errorf("SeqAtomicTryLoadInt: got (%v, true), wanted (_, false)", got)
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}
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seq.EndWrite()
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}
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func TestSeqAtomicTryLoadAfterWrite(t *testing.T) {
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var seq sync.SeqCount
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var data int
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epoch := seq.BeginRead()
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seq.BeginWrite()
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seq.EndWrite()
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if got, ok := SeqAtomicTryLoadInt(&seq, epoch, &data); ok {
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t.Errorf("SeqAtomicTryLoadInt: got (%v, true), wanted (_, false)", got)
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}
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}
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func BenchmarkSeqAtomicLoadIntUncontended(b *testing.B) {
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var seq sync.SeqCount
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const want = 42
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data := want
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b.RunParallel(func(pb *testing.PB) {
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for pb.Next() {
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if got := SeqAtomicLoadInt(&seq, &data); got != want {
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b.Fatalf("SeqAtomicLoadInt: got %v, wanted %v", got, want)
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}
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}
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})
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}
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func BenchmarkSeqAtomicTryLoadIntUncontended(b *testing.B) {
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var seq sync.SeqCount
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const want = 42
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data := want
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b.RunParallel(func(pb *testing.PB) {
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epoch := seq.BeginRead()
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for pb.Next() {
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if got, ok := SeqAtomicTryLoadInt(&seq, epoch, &data); !ok || got != want {
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b.Fatalf("SeqAtomicTryLoadInt: got (%v, %v), wanted (%v, true)", got, ok, want)
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}
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}
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})
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}
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// For comparison:
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func BenchmarkAtomicValueLoadIntUncontended(b *testing.B) {
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var a atomic.Value
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const want = 42
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a.Store(int(want))
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b.RunParallel(func(pb *testing.PB) {
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for pb.Next() {
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if got := a.Load().(int); got != want {
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b.Fatalf("atomic.Value.Load: got %v, wanted %v", got, want)
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}
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}
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})
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}
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