Prabhu Sunderaraman: prabhu@durasoftindia.com: Page 2

Lockdown Learning – Day #44– Waiting for Goroutines in GoLang (Music Only)

By Prabhu Sunderaraman on May 8, 2020 in Go, Golang

Continuing with our lockdown learning of Go language. Here’s a video on the Need to wait for goroutines in Golang

A goroutine may have to wait for another goroutine to complete. Using time.Sleep() is a very crude way to wait

package main

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

func main() {
	go fixIssues()
	time.Sleep(time.Second * 5) //Unreliable.
	//So it would be good for the main goroutine to wait for fixIssues goroutine to complete
	//How do we do that? Next video 
	fmt.Println("***Enough! I am done waiting")
}

func fixIssues()  {
	i := 0
	rand.Seed(time.Now().UnixNano())
	iterations := rand.Intn(20)
	fmt.Println("Time required:", iterations, "seconds")
	for i < iterations {
		fmt.Println("Fixing Issues ...")
		time.Sleep(time.Second * 1)
		i++
	}
}

You can watch other videos in Go lang in the links below

Getting Started

Variables and Constants

Conditional statements

Functions – Part I

Functions – Part II

Type Conversions

struct – Part I

struct – Part II

struct – Part III

Pointers – Part I

Pointers – Part II

interface – Part I

interface – Part II

interface – Part III

interface – Part IV

defer – Part I

defer – Part II

defer – Part III

defer – Part III

panic and recover

panic, recover and defer

Getting started with GoLand IDE.

Getting started with GoLand IDE.

import packages – Part I.

import packages – Part II.

import packages – Part III.

goroutine – intro .

goroutines & panic.

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Lockdown Learning – Day #43– Goroutines & Panic in GoLang (Music Only)

By Prabhu Sunderaraman on May 7, 2020 in Go, Golang

Continuing with our lockdown learning of Go language. Here’s a video on panic in goroutines in Golang

A goroutine needs to have it’s own recover functions. Here’s the code that shows that

package main

import (
	"fmt"
	"time"
)

func main()  {
	go func() {
		defer func() {
			if r:=recover(); r != nil {
				fmt.Println("Error", r)
			}
		}()

		arr := [5]int{}

		//Something silly 
		for i:=0; i< 15; i++ {
			fmt.Println(arr[i])
		}
	}()
	time.Sleep(time.Second)
	fmt.Println("End of main")
}

You can watch other videos in Go lang in the links below

Getting Started

Variables and Constants

Conditional statements

Functions – Part I

Functions – Part II

Type Conversions

struct – Part I

struct – Part II

struct – Part III

Pointers – Part I

Pointers – Part II

interface – Part I

interface – Part II

interface – Part III

interface – Part IV

defer – Part I

defer – Part II

defer – Part III

defer – Part III

panic and recover

panic, recover and defer

Getting started with GoLand IDE.

Getting started with GoLand IDE.

import packages – Part I.

import packages – Part II.

import packages – Part III.

goroutine – intro .

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Lockdown Learning – Day #42– Goroutines – Intro in GoLang (Music Only)

By Prabhu Sunderaraman on May 6, 2020 in Go, Golang

Continuing with our lockdown learning of Go language. Here’s the a short intro to Goroutines in Golang

Here’s a list of things about go routines

Goroutines are “lightweight” threads
“lightweight” threads because they are not OS threads
Exist and managed within the Goruntime
go () starts a new Goroutine
main() itself runs as Goroutine

You can watch other videos in Go lang in the links below

Getting Started

Variables and Constants

Conditional statements

Functions – Part I

Functions – Part II

Type Conversions

struct – Part I

struct – Part II

struct – Part III

Pointers – Part I

Pointers – Part II

interface – Part I

interface – Part II

interface – Part III

interface – Part IV

defer – Part I

defer – Part II

defer – Part III

defer – Part III

panic and recover

panic, recover and defer

Getting started with GoLand IDE.

Getting started with GoLand IDE.

import packages – Part I.

import packages – Part II.

import packages – Part III.

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Lockdown Learning – Day #41– import packages – Part III in GoLang (Music Only)

By Prabhu Sunderaraman on May 5, 2020 in Go, Golang

Continuing with our lockdown learning of Go language. Here’s the third part of the video on import packagesin Golang

You can watch other videos in Go lang in the links below

Getting Started

Variables and Constants

Conditional statements

Functions – Part I

Functions – Part II

Type Conversions

struct – Part I

struct – Part II

struct – Part III

Pointers – Part I

Pointers – Part II

interface – Part I

interface – Part II

interface – Part III

interface – Part IV

defer – Part I

defer – Part II

defer – Part III

defer – Part III

panic and recover

panic, recover and defer

Getting started with GoLand IDE.

Getting started with GoLand IDE.

import packages – Part I.

import packages – Part II.

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Lockdown Learning – Day #40 – import packages – Part II in GoLang (Music Only)

By Prabhu Sunderaraman on May 4, 2020 in Go, Golang

Continuing with our lockdown learning of Go language. Here’s the second part of the video on import packagesin Golang

You can watch other videos in Go lang in the links below

Getting Started

Variables and Constants

Conditional statements

Functions – Part I

Functions – Part II

Type Conversions

struct – Part I

struct – Part II

struct – Part III

Pointers – Part I

Pointers – Part II

interface – Part I

interface – Part II

interface – Part III

interface – Part IV

defer – Part I

defer – Part II

defer – Part III

defer – Part III

panic and recover

panic, recover and defer

Getting started with GoLand IDE.

Getting started with GoLand IDE.

import packages – Part I.

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