Goroutines

Ek goroutine ek lightweight, independently-running function hai, jo ek function call ke aage go lagakar start kiya jaata hai. Goroutines cheap hote hain — ek Go program ek saath hazaaron chala sakta hai — aur yeh language ka hi ek core part hain, koi add-on library nahi.

package main

import (
	"fmt"
	"sync"
)

func main() {
	var wg sync.WaitGroup
	results := make([]int, 3)

	for i := 0; i < 3; i++ {
		wg.Add(1)
		go func(index int) {
			defer wg.Done()
			results[index] = index * index
		}(i)
	}

	wg.Wait()
	fmt.Println(results)
}

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sync.WaitGroup woh tarika hai jisse main ek group ke goroutines ke finish hone ka wait karta hai aage badhne se pehle — wg.Add(1) ek goroutine ko wait karne ke liye register karta hai, aur har goroutine complete hone par wg.Done() call karta hai; wg.Wait() tab tak block karta hai jab tak har registered goroutine check in na kar le.

Aage: channels — goroutines ek doosre se safely kaise communicate karte hain.