package main

import (
	"fmt"
	"sync"
	"time"
)

type Rate struct {
	RPM int
	mu  sync.Mutex
}

func main() {
	r := Rate{RPM: 10}
	for i := 0; i < 10; i++ {
		go func(j int) {
			r.RateLimit()
			fmt.Println("Rate limiting")
		}(i)
	}
	time.Sleep(time.Minute)
}

func (r *Rate) RateLimit() {
	// Lock for the fraction of a minute based on RPM
	r.mu.Lock()
	// Unlock after the fraction of a minute
	time.Sleep(time.Minute / time.Duration(r.RPM))
	r.mu.Unlock()
}