Golang sync.Cond example

go_cond_example.go

package main

import (
	"context"
	"sync"
	"time"
)

func main() {
	serverReadyCond := sync.NewCond(&sync.Mutex{})

	go func() {
		println("waiter 1")
		serverReadyCond.L.Lock()
		serverReadyCond.Wait()
		println("waiter 1 woke")
		serverReadyCond.L.Unlock()
		println("waiter 1 done")
	}()

	go func() {
		println("waiter 2")
		serverReadyCond.L.Lock()
		serverReadyCond.Wait()
		println("waiter 2 woke")
		serverReadyCond.L.Unlock()
		println("waiter 2 done")
	}()

	go func() {
		println("server init")
		time.Sleep(5 * time.Second)
		serverReadyCond.L.Lock()
		serverReadyCond.Broadcast()
		println("server started")
		serverReadyCond.L.Unlock()
		println("server done")
	}()

	duration, _ := time.ParseDuration("30s")
	ctx, _ := context.WithTimeout(context.Background(), duration)
	<-ctx.Done()
}