mutex cost

mutexbench.go

package goczmq

import (
	"sync"
	"testing"
)

// WITHOUT MUTEX

type WithoutMutex struct {
	value int
}

func (w *WithoutMutex) Set(val int) {
	w.value = val
}

func (w *WithoutMutex) Get() int {
	return w.value
}

func BenchmarkSetGet(b *testing.B) {
	w := &WithoutMutex{value: 0}

	for i := 0; i < b.N; i++ {
		w.Set(i)
		n := w.Get()
		if n != i {
			panic("wrong number")
		}
	}
}

// WITH MUTEX

type WithMutex struct {
	value int
	m     *sync.Mutex
}

func (w *WithMutex) Set(val int) {
	w.m.Lock()
	w.value = val
	w.m.Unlock()
}

func (w *WithMutex) Get() int {
	w.m.Lock()
	defer w.m.Unlock()
	return w.value
}

func BenchmarkSetGetMutex(b *testing.B) {
	w := &WithMutex{value: 0, m: &sync.Mutex{}}

	for i := 0; i < b.N; i++ {
		w.Set(i)
		n := w.Get()
		if n != i {
			panic("wrong number")
		}
	}
}