0xc0d

var mutex sync.Mutex
type Person struct {
	Age int
}
persons := make([]Person, 10)
for _, p := range persons {
	mutex.Lock()
	// defer mutex.Unlock()
	p.Age = 13
	mutex.Unlock()

0xc0d

var mutex sync.Mutex
type Person struct {
	Age int
}
persons := make([]Person, 10)
for _, p := range persons {
	func() {
		mutex.Lock()
		defer mutex.Unlock()
		p.Age = 13

0xc0d

func doReq(timeout time.Duration) obj {
	// ch :=make(chan obj)
	ch := make(chan obj, 1)
	go func() {
		obj := do()
		ch <- result
	} ()
	select {
	case result = <- ch :
		return result

0xc0d

type BadOrderedPerson struct {
	Veteran bool   // 1 byte
	Name    string // 16 byte
	Age     int32  // 4 byte
}

type OrderedPerson struct {
	Name    string
	Age     int32
	Veteran bool

0xc0d

type BadOrderedPerson struct {
	Veteran bool     // 1 byte
	_       [7]byte  // 7 byte: padding for alignment
	Name    string   // 16 byte
	Age     int32    // 4 byte
	_       struct{} // to prevent unkeyed literals
	// zero sized values, like struct{} and [0]byte occurring at 
	// the end of a structure are assumed to have a size of one byte.
	// so padding also will be addedd here as well.
	

0xc0d

func init() {
	http.HandleFunc("/debug/pprof/", Index)
	http.HandleFunc("/debug/pprof/cmdline", Cmdline)
	http.HandleFunc("/debug/pprof/profile", Profile)
	http.HandleFunc("/debug/pprof/symbol", Symbol)
	http.HandleFunc("/debug/pprof/trace", Trace)
}

0xc0d

func init() {
	go func() {
		http.ListenAndServe(":1234", nil)
	}()
}

0xc0d

func main() {
	defer profile.Start(profile.ProfilePath(".")).Stop()
	// do something
}

0xc0d

// CPUProfile enables cpu profiling. Note: Default is CPU
defer profile.Start(profile.CPUProfile).Stop()

// GoroutineProfile enables goroutine profiling.
// It returns all Goroutines alive when defer occurs.
defer profile.Start(profile.GoroutineProfile).Stop()

// BlockProfile enables block (contention) profiling.
defer profile.Start(profile.BlockProfile).Stop()

0xc0d

import (
	"encoding/json"
	"math/rand"
	"net/http"
	_ "net/http/pprof"
	"time"
)

func main() {
	http.HandleFunc("/log", logHandler)