「让我们一起 Golang」怎样出让协程资源和设置可用 CPU 核心数

子协程0 0子协程0 1子协程0 2子协程0 3子协程0 4子协程0 5子协程2 0子协程2 1子协程2 2子协程2 3子协程2 4子协程2 5子协程2 6子协程2 7子协程1 0子协程0 6子协程0 7子协程1 1子协程1 2子协程1 3子协程1 4子协程1 5子协程1 6子协程1 7

func main() {  for i:=0;i<3;i++{    go func(index int) {      task("子协程"+strconv.Itoa(index))    }(i)  }  time.Sleep(5 * time.Second)}
func task(name string)  {  for i:=0;i<8;i++{    if name == "子协程1"{            //Gosched yields the processor, allowing other goroutines to run. It does not suspend the current goroutine, so execution resumes automatically.      runtime.Gosched()    }    fmt.Println(name,i)  }}

package main
import (  "fmt"  "runtime")
func main() {
  fmt.Println("可用CPU核心数为",runtime.NumCPU())      // GOMAXPROCS sets the maximum number of CPUs that can be executing    // simultaneously and returns the previous setting. If n < 1, it does not    // change the current setting.    // The number of logical CPUs on the local machine can be queried with NumCPU.    // This call will go away when the scheduler improves.  fmt.Println("设置CPU的可用核数为1，先前的设置为",runtime.GOMAXPROCS(1))}