The role of error handling in golang function concurrency

Error handling in concurrent functions is crucial, and the Go language provides a variety of methods to handle errors: Use the error type to store error messages. Pass errors through function parameters or return types. Use the errgroup package to collect and handle errors for concurrent function groups. Use custom error types to provide more specific information. Proper handling of errors ensures the robustness and reliability of concurrent functions.

The role of error handling in Go language function concurrency

In concurrent programming, it is crucial to handle errors correctly, because an error in a function may Have an impact on other concurrent functions. The Go language provides several ways to handle errors in concurrent functions.

Using the error type

error type is a built-in type used by the Go language to handle errors. error The variable stores the error message or any value that represents the cause of the error.

Passing errors

Concurrent functions can pass errors through function parameters or return types. For example:

func doSomething() error {
    // 在这里执行任务

    return nil // 如果没有错误，则返回 nil
}

Then, the function can be called as follows:

err := doSomething()
if err != nil {
    // 处理错误
}

Using errgroup

##errgroup provided by the ## package #sync.ErrGroup type, which is used to collect and handle errors in concurrent function groups. Use

as follows: <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:go;toolbar:false;'>import ( &quot;context&quot; &quot;errors&quot; &quot;fmt&quot; &quot;sync&quot; ) func main() { var g sync.WaitGroup // 用于等待并发函数完成 g.Add(2) ctx := context.Background() eg := sync.ErrGroup{} eg.Go(func() error { defer g.Done() return errors.New(&quot;函数 1 失败&quot;) }, ctx) eg.Go(func() error { defer g.Done() // 这里执行任务 return nil }, ctx) g.Wait() // 检查是否有错误并进行处理 if err := eg.Wait(); err != nil { fmt.Println(&quot;错误:&quot;, err) } }</pre><div class="contentsignin">Copy after login</div></div>Use custom error types

You can use custom error types to provide more specific information about errors. For example:

type MyError struct {
    message string
}

func (e *MyError) Error() string {
    return e.message
}

Then, you can create and return

in the concurrent function. Error:

func doSomething() error {
    // 在这里执行任务

    return &MyError{"函数 1 失败"}
}