主协程退出,子协程也跟着挂

主协程退出,子协程也跟着挂

func main() {
   go func() {
      i := 0
      for {
         i++
         fmt.Println("子 i = ", i)
         time.Sleep(time.Second)
         
      }
   }()    //别忘记()

   i := 0
   for {
      i++
      fmt.Println("main i = ", i)
      time.Sleep(time.Second)

      if i == 2 {
         break
      }
   }

}

子协程退出

import (
	"runtime"
	"sync"
)

func main() {
	wg := new(sync.WaitGroup)
	wg.Add(1)

	go func() {
		defer wg.Done()
		defer println("A.defer")

		func() {
			defer println("B.defer")
			runtime.Goexit() // 终止当前 goroutine
			println("B")     // 不会执行
		}()

		println("A") // 不会执行
	}()

	wg.Wait()
}

输出结果:

B.defer
A.defer