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Go – StoreInt64() in sync/atomic package

In this article, we will explore the StoreInt64() Function in sync/atomic package in Go in details, along with examples.

The StoreInt64 function is part of the “sync/atomic” package in Go, which supplies low-level atomic memory operations. This function atomically sets the value of an int64 variable. It is a write operation that ensures the value written is immediately visible to other concurrent threads. The function signature is as follows:


func StoreInt64(addr *int64, val int64)

The function takes a pointer to an int64 variable addr and an int64 value val as arguments. It sets the value of addr to val atomically.


To illustrate the usage of the StoreInt64 function, let’s create a simple program simulating concurrent data access. We will create two goroutines: one that sets a shared flag to a specific value using the StoreInt64 function and another that reads and prints the flag value using the atomic.LoadInt64 function.

package main

import (






func main() {

	var flag int64 = 0

	var wg sync.WaitGroup

	// Writer goroutine

	go func() {

		defer wg.Done()

		for i := 0; i < 5; i++ {

			atomic.StoreInt64(&flag, int64(i+1))

			fmt.Printf("Writer: Flag set to %d\n", i+1)

			time.Sleep(time.Millisecond * 500)



	// Reader goroutine

	go func() {

		defer wg.Done()

		for i := 0; i < 10; i++ {

			fmt.Printf("Reader: Current flag value is %d\n", atomic.LoadInt64(&flag))

			time.Sleep(time.Millisecond * 250)





In this example, we use the sync.WaitGroup to ensure that both goroutines complete before the program exits. The writer goroutine sets the flag value using the atomic.StoreInt64 function, ensuring atomicity. Meanwhile, the reader goroutine reads the flag value using the atomic.LoadInt64 function, guaranteeing that it always reads the latest value written by the writer goroutine.

This example demonstrates how the StoreInt64 function can be used to perform atomic write operations on a shared int64 variable, ensuring data consistency across concurrent threads.


The StoreInt64 function is a critical utility provided by the sync/atomic package in Go, enabling atomic write operations on int64 variables. It is particularly useful in concurrent programming when multiple goroutines access shared memory. Using the StoreInt64 function ensures data consistency and helps eliminate race conditions, contributing to the overall stability and reliability of your concurrent Go applications.

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Posted in golang, packages, sync

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