0x1042

|----------------------------------------------------------------------------------------|--------------------|
|                                    Object Header (64 bits)                             |        State       |
|-------------------------------------------------------|--------------------------------|--------------------|
|                  Mark Word (32 bits)                  |      Klass Word (32 bits)      |                    |
|-------------------------------------------------------|--------------------------------|--------------------|
| identity_hashcode:25 | age:4 | biased_lock:1 | lock:2 |      OOP to metadata object    |       Normal       |
|-------------------------------------------------------|--------------------------------|--------------------|
|  thread:23 | epoch:2 | age:4 | biased_lock:1 | lock:2 |      OOP to metadata object    |       Biased       |
|-------------------------------------------------------|--------------------------------|--------------------|
|               

0x1042

Code organization

Overview

• Go programmers typically keep all their Go code in a single workspace.
• A workspace contains many version control repositories (managed by Git, for example).
• Each repository contains one or more packages.

0x1042

package main

import (
	"context"
	"flag"
	"fmt"
	"log"
	"net/http"
	"os"
	"os/signal"

0x1042

package main

import (
	"io"
	"net/http"
	"sync/atomic"
)

func index() http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {