Go buffered channel

buffer_channel.go

import (
	"sync"
	"fmt"
)

func maxGoRoutinesExample(maxNumberOfConnections int) {
	var wg sync.WaitGroup
	guard := make(chan int, maxNumberOfConnections)

	for i := 0; i < 100; i++ {
		wg.Add(1)
		// Add to a channel.
		guard <- 1

		go func() {
		 	// This make sure that you finish the wait group.
			defer wg.Done()
			
			doAnything()

			// Remove form channel when finish
			<-guard
		}()
	}

	// Wait all go routines to finish
	wg.Wait() 
}