Example on pause and resume threads in golang

pause_resume.go

package main

import (
	"fmt"
	"runtime"
	"time"
)

// Thread stages
const (
	Pause = "pause"
	Run   = "run"
	Stop  = "stop"
)

func myThread(stateChan <-chan string) {
	state := Pause

	for {
		select {
		case state = <-stateChan:
			switch state {
			case Pause:
				fmt.Println("Pausing")
			case Run:
				fmt.Println("Starting")
			case Stop:
				fmt.Println("Stopping")
				return
			}
		default:
			// runtime.Gosched()
			if state == Pause {
				break
			}

			fmt.Println(time.Now())
		}
	}
}

func main() {
	runtime.GOMAXPROCS(runtime.NumCPU())
	ch := make(chan string)

	go myThread(ch)
	defer func() {
		ch <- Stop
	}()
	ch <- Run
	for i := 0; i < 1000000; i++ {
		fmt.Println("Counter", i)
		if i%50 == 0 {
			ch <- Pause
			time.Sleep(5 * time.Second)
			ch <- Run
		}

	}
}