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spinlock_test.go
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package sync
import (
"sync"
"testing"
)
func TestTryLock(t *testing.T) {
var sl SpinLock
if !sl.TryLock() {
t.Error("TryLock failed.")
}
}
func TestLock(t *testing.T) {
var sl SpinLock
sl.Lock()
if sl.TryLock() {
t.Error("TryLock() returned true when it shouldn't have, w t f mate?")
}
sl.Unlock()
if !sl.TryLock() {
t.Error("TryLock() returned false when it shouldn't have.")
}
}
type SpinMap struct {
SpinLock
m map[int]bool
}
func (sm *SpinMap) Add(i int) {
sm.Lock()
sm.m[i] = true
sm.Unlock()
}
func (sm *SpinMap) Get(i int) (b bool) {
sm.Lock()
b = sm.m[i]
sm.Unlock()
return
}
type MutexMap struct {
sync.Mutex
m map[int]bool
}
func (mm *MutexMap) Add(i int) {
mm.Lock()
mm.m[i] = true
mm.Unlock()
}
func (mm *MutexMap) Get(i int) (b bool) {
mm.Lock()
b = mm.m[i]
mm.Unlock()
return
}
type RWMutexMap struct {
sync.RWMutex
m map[int]bool
}
func (mm *RWMutexMap) Add(i int) {
mm.Lock()
mm.m[i] = true
mm.Unlock()
}
func (mm *RWMutexMap) Get(i int) (b bool) {
mm.RLock()
b = mm.m[i]
mm.RUnlock()
return
}
const N = 1e3
var (
sm = SpinMap{m: map[int]bool{}}
mm = MutexMap{m: map[int]bool{}}
rwmm = RWMutexMap{m: map[int]bool{}}
)
func BenchmarkSpinL(b *testing.B) {
var wg sync.WaitGroup
for i := 0; i < b.N; i++ {
wg.Add(N * 2)
for i := 0; i < N; i++ {
go func(i int) {
sm.Add(i)
wg.Done()
}(i)
go sm.Get(i)
go func(i int) {
sm.Get(i - 1)
sm.Get(i + 1)
wg.Done()
}(i)
}
}
wg.Wait()
}
func BenchmarkMutex(b *testing.B) {
var wg sync.WaitGroup
for i := 0; i < b.N; i++ {
wg.Add(N * 2)
for i := 0; i < N; i++ {
go func(i int) {
mm.Add(i)
wg.Done()
}(i)
go mm.Get(i)
go func(i int) {
mm.Get(i - 1)
mm.Get(i + 1)
wg.Done()
}(i)
}
}
wg.Wait()
}
func BenchmarkRWMutex(b *testing.B) {
var wg sync.WaitGroup
for i := 0; i < b.N; i++ {
wg.Add(N * 2)
for i := 0; i < N; i++ {
go func(i int) {
rwmm.Add(i)
wg.Done()
}(i)
go mm.Get(i)
go func(i int) {
rwmm.Get(i - 1)
rwmm.Get(i + 1)
wg.Done()
}(i)
}
}
wg.Wait()
}