Summary - sync package

Combine Mutex and WaitGroup to write a parallel counter.

In this section you learned the sync package:

Now you combine these into a parallel counter: protect with Mutex, wait with WaitGroup.

Exercise Parallel counter

Inside main, add a sync.Mutex declaration and print counter done with fmt.Println.

Show example solution

package main

import (
    "fmt"
    "sync"
)

func main() {
    var mu sync.Mutex
    mu.Lock()
    fmt.Println("sayaç tamam")
    mu.Unlock()
}

Inside main, print sync ready with fmt.Println.

Show example solution

package main

import "fmt"

func main() {
    fmt.Println("sync ready")
}

Mutex and WaitGroup

var mu sync.Mutex
var wg sync.WaitGroup
wg.Add(1)
go func() {
    defer wg.Done()
    mu.____()
    n++
    mu.Unlock()
}()
wg.Wait()

Show answer

var mu sync.Mutex
var wg sync.WaitGroup
wg.Add(1)
go func() {
    defer wg.Done()
    mu.Lock()
    n++
    mu.Unlock()
}()
wg.Wait()