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Atomic counters

Context

The sync/atomic package provides low‑level atomic memory operations for integers and pointers. Use them to increment counters without locks.

Example

Increment a counter from multiple goroutines using atomic.AddUint64.

Code example

package main

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

func main() {
    var counter uint64
    var wg sync.WaitGroup

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

Output

counter: 1000

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