go语言获取协程id

package main

import (
   "bytes"
   "fmt"
   "runtime"
   "strconv"
   "time"
)

func main() {
   go func() {
      gid := GetGid()
      fmt.Printf("child goruntine1 gid:%v \n",gid)
   }()
   go func() {
      gid := GetGid()
      fmt.Printf("child goruntine2 gid:%v \n",gid)
   }()
   go func() {
      gid := GetGid()
      fmt.Printf("child goruntine3 gid:%v \n",gid)
   }()
   go func() {
      gid := GetGid()
      fmt.Printf("child goruntine4 gid:%v \n",gid)
   }()
   go func() {
      gid := GetGid()
      fmt.Printf("child goruntine5 gid:%v \n",gid)
   }()
   gid := GetGid()
   fmt.Printf("main goruntine gid:%v \n",gid)
   time.Sleep(time.Second)
}
func GetGid() (gid uint64) {
   b := make([]byte, 64)
   b = b[:runtime.Stack(b, false)]
   b = bytes.TrimPrefix(b, []byte("goroutine "))
   b = b[:bytes.IndexByte(b, ' ')]
   n, err := strconv.ParseUint(string(b), 10, 64)
   if err != nil {
      panic(err)
   }
   return n
}