Atomic

• Low level atomic operations on memory.
• Lockless operation.
• Used for atomic operations on counters.

atomic.AddUint64(&ops,1)
value := atomic.LoadUint64(&ops)

Exercises

https://go.dev/play/p/s7kcfghrbof

package main

import (
    "fmt"
    "runtime"
    "sync"
    "sync/atomic"
)

func main() {
    runtime.GOMAXPROCS(4)

    var counter uint64
    var wg sync.WaitGroup

    // TODO: implement concurrency safe counter

    for i := 0; i < 50; i++ {
        wg.Add(1)
        go func() {
            defer wg.Done()
            for c := 0; c < 1000; c++ {
                // counter++
                atomic.AddUint64(&counter, 1)
            }
        }()
    }
    wg.Wait()
    fmt.Println("counter: ", counter)
}