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// Copyright 2016 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 sync_test
import (
"math/rand"
"reflect"
"runtime"
"sync"
"testing"
"testing/quick"
)
type mapOp string
const (
opLoad = mapOp("Load")
opStore = mapOp("Store")
opLoadOrStore = mapOp("LoadOrStore")
opDelete = mapOp("Delete")
)
var mapOps = [...]mapOp{opLoad, opStore, opLoadOrStore, opDelete}
// mapCall is a quick.Generator for calls on mapInterface.
type mapCall struct {
op mapOp
k, v interface{}
}
func (c mapCall) apply(m mapInterface) (interface{}, bool) {
switch c.op {
case opLoad:
return m.Load(c.k)
case opStore:
m.Store(c.k, c.v)
return nil, false
case opLoadOrStore:
return m.LoadOrStore(c.k, c.v)
case opDelete:
m.Delete(c.k)
return nil, false
default:
panic("invalid mapOp")
}
}
type mapResult struct {
value interface{}
ok bool
}
func randValue(r *rand.Rand) interface{} {
b := make([]byte, r.Intn(4))
for i := range b {
b[i] = 'a' + byte(rand.Intn(26))
}
return string(b)
}
func (mapCall) Generate(r *rand.Rand, size int) reflect.Value {
c := mapCall{op: mapOps[rand.Intn(len(mapOps))], k: randValue(r)}
switch c.op {
case opStore, opLoadOrStore:
c.v = randValue(r)
}
return reflect.ValueOf(c)
}
func applyCalls(m mapInterface, calls []mapCall) (results []mapResult, final map[interface{}]interface{}) {
for _, c := range calls {
v, ok := c.apply(m)
results = append(results, mapResult{v, ok})
}
final = make(map[interface{}]interface{})
m.Range(func(k, v interface{}) bool {
final[k] = v
return true
})
return results, final
}
func applyMap(calls []mapCall) ([]mapResult, map[interface{}]interface{}) {
return applyCalls(new(sync.Map), calls)
}
func applyRWMutexMap(calls []mapCall) ([]mapResult, map[interface{}]interface{}) {
return applyCalls(new(RWMutexMap), calls)
}
func applyDeepCopyMap(calls []mapCall) ([]mapResult, map[interface{}]interface{}) {
return applyCalls(new(DeepCopyMap), calls)
}
func TestMapMatchesRWMutex(t *testing.T) {
if err := quick.CheckEqual(applyMap, applyRWMutexMap, nil); err != nil {
t.Error(err)
}
}
func TestMapMatchesDeepCopy(t *testing.T) {
if err := quick.CheckEqual(applyMap, applyDeepCopyMap, nil); err != nil {
t.Error(err)
}
}
func TestConcurrentRange(t *testing.T) {
const mapSize = 1 << 10
m := new(sync.Map)
for n := int64(1); n <= mapSize; n++ {
m.Store(n, int64(n))
}
done := make(chan struct{})
var wg sync.WaitGroup
defer func() {
close(done)
wg.Wait()
}()
for g := int64(runtime.GOMAXPROCS(0)); g > 0; g-- {
r := rand.New(rand.NewSource(g))
wg.Add(1)
go func(g int64) {
defer wg.Done()
for i := int64(0); ; i++ {
select {
case <-done:
return
default:
}
for n := int64(1); n < mapSize; n++ {
if r.Int63n(mapSize) == 0 {
m.Store(n, n*i*g)
} else {
m.Load(n)
}
}
}
}(g)
}
iters := 1 << 10
if testing.Short() {
iters = 16
}
for n := iters; n > 0; n-- {
seen := make(map[int64]bool, mapSize)
m.Range(func(ki, vi interface{}) bool {
k, v := ki.(int64), vi.(int64)
if v%k != 0 {
t.Fatalf("while Storing multiples of %v, Range saw value %v", k, v)
}
if seen[k] {
t.Fatalf("Range visited key %v twice", k)
}
seen[k] = true
return true
})
if len(seen) != mapSize {
t.Fatalf("Range visited %v elements of %v-element Map", len(seen), mapSize)
}
}
}