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Go – AddUint64 in sync/atomic package in Go

In this article, we will explore the AddUint64 Function in sync/atomic package in Go in details, along with examples.

AddUint64 in sync/atomic package in Go performs an atomic addition operation on a given unsigned 64-bit integer (uint64). The function signature is as follows:


func AddUint64(addr *uint64, delta uint64) (new uint64)

AddUint64 accepts two arguments:

  • addr: A pointer to the uint64 value that you want to update atomically.
  • delta: The uint64 value you want to add to the value at addr.

The function returns the new value after the addition is complete.

Using AddUint64 in Go

In concurrent programming, multiple goroutines may access and modify shared data simultaneously. This can lead to race conditions and incorrect results. The AddUint64 function ensures that the addition operation is performed atomically, preventing any data races or inconsistencies.

Here’s an example of how to use the AddUint64 function to safely increment a counter from multiple goroutines:


package main

import (





var counter uint64

func main() {

	var wg sync.WaitGroup


	for i := 0; i < 100; i++ {

		go func() {

			defer wg.Done()

			atomic.AddUint64(&counter, 1)



	fmt.Printf("Counter value: %d\n", counter)


In this example, we create a global counter variable of type uint64. Then, we launch 100 goroutines, each of which increments the counter by 1 using AddUint64. The sync.WaitGroup is used to ensure that the main goroutine waits for all the other goroutines to finish their execution.

After all goroutines have finished, the main goroutine prints the value of the counter. Since we used AddUint64 to update the counter atomically, we can be confident that the final value is correct and free of data races.


The AddUint64 function in the sync/atomic package is a powerful tool for performing atomic addition operations on unsigned 64-bit integers in Go. By using this function, you can ensure that your concurrent programs are safe from race conditions and data inconsistencies. Make sure to explore other atomic operations provided by the sync/atomic package to implement complex synchronization algorithms and develop efficient concurrent applications in Go.

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Posted in golang, packages, sync

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