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Wait for function to complete in golang

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Feb 13, 2024 am 08:15 AM

在 golang 中等待函数完成

In golang, waiting for a function to complete is a common programming requirement. Whether you are waiting for a goroutine to complete or waiting for data in a channel to arrive, you need to use a suitable waiting method to handle it. In this article, we will introduce you to some methods and techniques to wait for function completion in golang. Whether you are a beginner or an experienced developer, this article will provide you with helpful guidance and sample code to help you better handle waiting for functions to complete scenarios. Let’s take a closer look!

Question content

I have the following code in golang:

func A(){
  go print("hello")
}

func main() {
  A()
  // here I want to wait for the print to happen
  B()
}

How to ensure that b() is only executed after printing has occurred?

Solution

Use sync.mutex

var l sync.mutex

func a() {
    go func() {
        print("hello")
        l.unlock()
    }()
}

func b() {
    print("world")
}

func testlock(t *testing.t) {
    l.lock()
    a()
    l.lock()
    // here i want to wait for the print to happen
    b()
    l.unlock()
}

Use sync.waitgroup

var wg sync.waitgroup

func a() {
    go func() {
        print("hello")
        wg.done()
    }()
}

func b() {
    print("world")
}

func testlock(t *testing.t) {
    wg.add(1)
    a()
    wg.wait()
    // here i want to wait for the print to happen
    b()
}

Use chan

func A() chan struct{} {
    c := make(chan struct{})
    go func() {     
        print("hello")
        c <- struct{}{}
    }()
    return c
}

func B() {
    print("world")
}

func TestLock(t *testing.T) {
    c := A()
    // here I want to wait for the print to happen
    <-c
    B()
}

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