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// Copyright 2019 The gVisor Authors.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package sync
import (
"reflect"
"testing"
"time"
)
func TestSeqCountWriteUncontended(t *testing.T) {
var seq SeqCount
seq.BeginWrite()
seq.EndWrite()
}
func TestSeqCountReadUncontended(t *testing.T) {
var seq SeqCount
epoch := seq.BeginRead()
if !seq.ReadOk(epoch) {
t.Errorf("ReadOk: got false, wanted true")
}
}
func TestSeqCountBeginReadAfterWrite(t *testing.T) {
var seq SeqCount
var data int32
const want = 1
seq.BeginWrite()
data = want
seq.EndWrite()
epoch := seq.BeginRead()
if data != want {
t.Errorf("Reader: got %v, wanted %v", data, want)
}
if !seq.ReadOk(epoch) {
t.Errorf("ReadOk: got false, wanted true")
}
}
func TestSeqCountBeginReadDuringWrite(t *testing.T) {
var seq SeqCount
var data int
const want = 1
seq.BeginWrite()
go func() {
time.Sleep(time.Second)
data = want
seq.EndWrite()
}()
epoch := seq.BeginRead()
if data != want {
t.Errorf("Reader: got %v, wanted %v", data, want)
}
if !seq.ReadOk(epoch) {
t.Errorf("ReadOk: got false, wanted true")
}
}
func TestSeqCountReadOkAfterWrite(t *testing.T) {
var seq SeqCount
epoch := seq.BeginRead()
seq.BeginWrite()
seq.EndWrite()
if seq.ReadOk(epoch) {
t.Errorf("ReadOk: got true, wanted false")
}
}
func TestSeqCountReadOkDuringWrite(t *testing.T) {
var seq SeqCount
epoch := seq.BeginRead()
seq.BeginWrite()
if seq.ReadOk(epoch) {
t.Errorf("ReadOk: got true, wanted false")
}
seq.EndWrite()
}
func BenchmarkSeqCountWriteUncontended(b *testing.B) {
var seq SeqCount
for i := 0; i < b.N; i++ {
seq.BeginWrite()
seq.EndWrite()
}
}
func BenchmarkSeqCountReadUncontended(b *testing.B) {
var seq SeqCount
b.RunParallel(func(pb *testing.PB) {
for pb.Next() {
epoch := seq.BeginRead()
if !seq.ReadOk(epoch) {
b.Fatalf("ReadOk: got false, wanted true")
}
}
})
}
func TestPointersInType(t *testing.T) {
for _, test := range []struct {
name string // used for both test and value name
val interface{}
ptrs []string
}{
{
name: "EmptyStruct",
val: struct{}{},
},
{
name: "Int",
val: int(0),
},
{
name: "MixedStruct",
val: struct {
b bool
I int
ExportedPtr *struct{}
unexportedPtr *struct{}
arr [2]int
ptrArr [2]*int
nestedStruct struct {
nestedNonptr int
nestedPtr *int
}
structArr [1]struct {
nonptr int
ptr *int
}
}{},
ptrs: []string{
"MixedStruct.ExportedPtr",
"MixedStruct.unexportedPtr",
"MixedStruct.ptrArr[]",
"MixedStruct.nestedStruct.nestedPtr",
"MixedStruct.structArr[].ptr",
},
},
} {
t.Run(test.name, func(t *testing.T) {
typ := reflect.TypeOf(test.val)
ptrs := PointersInType(typ, test.name)
t.Logf("Found pointers: %v", ptrs)
if (len(ptrs) != 0 || len(test.ptrs) != 0) && !reflect.DeepEqual(ptrs, test.ptrs) {
t.Errorf("Got %v, wanted %v", ptrs, test.ptrs)
}
})
}
}
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