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golang unsafe pointer

Restu Wahyu Saputra answered on August 13, 2024 Popularity 3/10 Helpfulness 1/10

answer golang unsafe pointer

golang unsafe pointer

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package main

import (
	"fmt"
	"sync"
	"sync/atomic"
	"unsafe"
)

type User struct {
	Name string `json:"name"`
}

// sekilas userGen aman tidak ada masalah, jika anda mengaktifkan race derector go run --race , maka ini akan error
// safe sharing data between gorutine, anda bisa menggunakan channel atau atomic

func main() {
	user := new(User)
	user.Name = "mawar atomic"
	userPtr := unsafe.Pointer(user)

	userChan := make(chan string, 1)
	userChan <- "mawar chan"

	userGen := "mawar general"

	wg := new(sync.WaitGroup)

	wg.Add(2)
	go func() {
		defer wg.Done()

		user = &User{Name: "suparman"}
		atomic.StorePointer(&userPtr, unsafe.Pointer(user))

		userChan <- "safira"
		userGen = "amarta"
	}()

	go func() {
		defer wg.Done()

		loadUserPtr := atomic.LoadPointer(&userPtr)
		user := (*User)(loadUserPtr)
		fmt.Println("Before Value Ptr: ", user.Name)

		fmt.Println("Before Value Chan: ", <-userChan)

		usg := userGen
		fmt.Println("Before Value Gen: ", usg)

		fmt.Print("\n")
	}()
	wg.Wait()

	userPtr = atomic.LoadPointer(&userPtr)
	user = (*User)(userPtr)
	fmt.Println("After Value Ptr: ", user.Name)

	fmt.Println("After Value Chan: ", <-userChan)

	fmt.Println("After Value Gen: ", userGen)
}

Popularity 3/10 Helpfulness 1/10 Language go

Source: Grepper

Tags: go unsafe

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Contributed on Aug 13 2024

Restu Wahyu Saputra

0 Answers Avg Quality 2/10

golang unsafe pointer

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