goRandomWalk1D.go

package main

import (
	"fmt"
	"math/rand"
	"sync"
	"time"
)

var wg sync.WaitGroup

func randomWalk1D(n int, c chan float64) {
	var x float64
	x = 0.0
	// fmt.Println(time.Now().UTC())
	for i := 0; i < n; i++ {
		x += rand.Float64() - 0.5
	}
	// fmt.Println(time.Now().UTC())
	c <- x
	defer wg.Done()
}

func main() {
	rand.Seed(time.Now().UTC().UnixNano())

	numThreads := 18
	numSteps := 1000000

	c := make(chan float64, numThreads)
	wg.Add(numThreads)
	for i := 0; i < numThreads; i++ {
		go randomWalk1D(numSteps, c)
	}

	wg.Wait()
	close(c)
	for i := 0; i < numThreads; i++ {
		fmt.Println(<-c)
	}
}