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Go – StoreUint32() in sync/atomic package

In this article, we will explore the StoreUint32() Function in sync/atomic package in Go in details, along with examples.

The StoreUint32 function is part of the “sync/atomic” package in Go, which supplies low-level atomic memory operations. This function atomically sets the value of a uint32 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 StoreUint32(addr *uint32, val uint32)

The function takes a pointer to a uint32 variable addr and a uint32 value val as arguments. It sets the value of addr to val atomically.


To illustrate the usage of the StoreUint32 function, let’s create a simple program simulating concurrent data access. We will create two goroutines: one that sets a shared counter to a specific value using the StoreUint32 function and another that reads and prints the counter value using the atomic.LoadUint32 function.

package main

import (






func main() {

	var counter uint32 = 0

	var wg sync.WaitGroup

	// Writer goroutine

	go func() {

		defer wg.Done()

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

			atomic.StoreUint32(&counter, uint32(i+1))

			fmt.Printf("Writer: Counter 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 counter value is %d\n", atomic.LoadUint32(&counter))

			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 counter value using the atomic.StoreUint32 function, ensuring atomicity. Meanwhile, the reader goroutine reads the counter value using the atomic.LoadUint32 function, guaranteeing that it always reads the latest value written by the writer goroutine.

This example demonstrates how the StoreUint32 function can be used to perform atomic write operations on a shared uint32 variable, ensuring data consistency across concurrent threads.


The StoreUint32 function is a critical utility provided by the sync/atomic package in Go, enabling atomic write operations on uint32 variables. It is particularly useful in concurrent programming when multiple goroutines access shared memory. Using the StoreUint32 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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