获取goroutine ID

var goroutineSpace = []byte("goroutine ")

func curGoroutineID() uint64 {
    b := make([]byte, 64)
    b = b[:runtime.Stack(b, false)]
    b = bytes.TrimPrefix(b, goroutineSpace)
    i := bytes.IndexByte(b, ' ')
    if i < 0 {
        panic(fmt.Sprintf("No space found in %q", b))
    }
    b = b[:i]
    n, err := strconv.ParseUint(string(b), 10, 64)
    if err != nil {
        panic(fmt.Sprintf("Failed to parse goroutine ID out of %q: %v", b, err))
    }
    return n
}

调用curGoroutineID函数获取goroutine的ID