53 lines
667 B
Go
53 lines
667 B
Go
package main
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import (
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"context"
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"fmt"
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"sync"
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"time"
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)
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var WG sync.WaitGroup
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func f1(ctx context.Context) {
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defer WG.Done()
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go f2(ctx)
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loop:
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for {
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fmt.Println("hello world")
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time.Sleep(time.Millisecond * 500)
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select {
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case <-ctx.Done():
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break loop
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default:
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}
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}
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}
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func f2(ctx context.Context) {
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defer WG.Done()
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loop:
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for {
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fmt.Println("hello wangao")
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time.Sleep(time.Millisecond * 500)
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select {
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case <-ctx.Done():
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break loop
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default:
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}
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}
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}
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func main() {
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ctx, cancel := context.WithCancel(context.Background())
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WG.Add(1)
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go f1(ctx)
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time.Sleep(time.Second * 3)
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//如何通知goroutine退出？
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cancel()
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WG.Wait()
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}
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