runtime.StackからgoroutineIDを取得する

runtime.stack.parse.go

package main

import (
	"log"
	"runtime"
	"sync"
)

func goroutineId() string {
	buf := make([]byte, 1024)
	runtime.Stack(buf, false)
	id := []byte{}
	if string(buf[0:9]) == "goroutine" {
		for _, c := range buf[10:] {
			if string(c) == " " {
				break
			}
			id = append(id, c)
		}
	}
	return string(id)
}

func main() {
	var wg sync.WaitGroup
	for i := 0; i < 10; i++ {
		wg.Add(1)
		go func() {
			log.Println(goroutineId())
			wg.Done()
		}()
	}
	wg.Wait()
}

$ go run runtime.stack.parse.go
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