Hey guys, looks like UKposts is still processing this video (#classic), so hopefully it will be in HD soon. Thanks for watching :)

Explaining thread in the woods because another cherno::thread is using the house for another video

Walked in the woods, found a Cherno doing c++ multithreading.

Cherno gave us a simple and great example of how to display a looping "Loading" text animation while waiting for our models and other materials to load. We learn c ++ with practical examples. Great things for beginners. Thanks dude!

I bet there was a bear family just behind you hiding in the bushes and learning C++:D great tutorial thanks a lot

There are plenty of good C++ tutorials out there, and this is by far the best C++ channel. Thank you.

You're doing great job bro. You are explaining things in a really clear way and not doing it in a boring way. Lucky to find you

I miss these videos in nature 😢

You are great at making things interesting. Loved all your videos so far. Thank you.

Thx for this series, exactly what i needed right now ! :)

Thanks for the C++ tutorials. I have seen most of your videos multiple times over the last few years. Now, your videos are my reference content whenever I need something in C++

Thank you for the clear tutorial! Very easy to follow your explanations

I have been waiting for this for so long...

I really like your videos. Great knowledge and charisma!

Cheers to Cherno! Hands down the best C++ tutorials. My guy somehow manages to explain a relatively complex topic along with example in about 10 mins. Just Awesome.

This series is absolutely outstanding!

A video on exception handling and a video on callbacks would be awesome if you haven't done those topics yet! Awesome videos man, you are a great teacher.

OMG i have been waiting

Dude I LOVE that you are in the woods. I want my office as programmer and engineer to be the summit of some mountain or in the middle of the forest. Thats badass.

Brilliant production Cherno! Both informative and aesthetically pleasing. I'm really looking forward to the new game engine series.

This was so helpful--thank you!

well explained, thanks for this awesome tutorial!

Hey Cherno - Amazing series. I would be very interested in a couple that explore optimisation strategies in greater detail.

Every Time I have a problem just you clarifying it gets me going!

That was a really nice review! Thank you

Thanks for another awesome video!

that's something I was thinking about some time ago, great think and great video

Great vid as always

That is so cool!!! like this multi-threading stuff is so freaking cool

Thank you alot for your videos!

Came here because of the recommendation, stayed to see how C++ enables threading, learned that C++ offers custom literals

Great video, love wood scenery

brilliant vid, thx

This is really good explanation for this.

Love your introductions.

i cant thank you enough, finally found what i needed

My wish is that maybe one day teach us about Neural Networks in C++. I'm loving your C++ series man !

great tutorial!!! I love your videos

Awesome video! Can you do please videos about multithreading problems and how to avoid them? (data race, deadlock,livelock,starvation, etc.)

If tutor is going in nature, why should we study in room, I'm watching this in nature. Cherno you are amazing brother ❤️❤️

Thanks Cherno

Love how you explained this. Ended up watching your video instead of my instructors' lecture because it was more content in less time more completely explained. Thanks for what you do!

Finally. I am waiting this.

My game engine uses a thread pool that I've written along with coroutines for the different components and a scheduler class. The scheduler determines how long and when each component should run based on amount of work and priority and because they're coroutines its easy to suspend them at many points, save their state, and then pick up execution from there during the next frame

Unique ideas to appear cool in UKposts! It sure is working.

I was teaching myself some network programming using UDP sockets and was printing off the state of the server into the console. Problem is that std::cout is really slow and it was taking up so much time my server was lagging behind the game. So what I did was stick the std::cout into a thread of it's own and put it in an infinite loop and just sleep it for 0.2 seconds after every draw. Just a toy example but something simple that shows the usefulness of threads.

Cherno you are a hero!

I love the fact that you are doing this in the forest!

Need more videos in C++ series! :)

Note that simple thread example is actually wrong: it accesses a global variable (s_Finished) from two different threads without using proper thread synchronisation - which according to the C++ 11 standard is "undefined behaviour". In fact, a C++ compiler is explicitly allowed to "optimise away" the read- access to the global variable s_Finsihed in your worker thread. Why? Because access to that variable is not using any thread synchronisation mechanisms (such as e.g. std::atomic), so the compiler is able to say: "Hey, s_Finished is never changed to false in this function call, so I may as well replace it with while(true)!". Of course also depending on the "optimisation level" that you set during compilation. And you would end up with a worker thread that would never stop! Also e.g. refer to the excellent UKposts video "Back to Basics: Concurrency - Arthur O'Dwyer - CppCon 2020". At around the time mark 6:45 it says: "Every write to a single memory location must be synchronise-with all other reads or writes of that memory location, or else the program has undefined behavior". And that's why there's a bit more behind concurrency than simply spawning multiple threads ;) But otherwise nice video that shows in simple ways how to create and join threads in C++ :)

It's easy to understand, thanks.

Locations behind looks so peaceful

Thanks!

powerful for image processing

Note: in real applications one should always use e.g. std::atomic for s_Finished (or other ways to ensure thread safety) to avoid race condition, which is a kind of undefined behaviour, which is very bad.

awesome!

love the birds in the background xd

hey charnya its amazing series

Awesome!

Thanks for the great video! Can you please do a follow up video on how Future, Promise and Coroutines work in C++?

thanks!

very well explained.

FYI open gl is single threaded .... I use threads in all my heap allocations but I try not to have more than 2 threads running at the same time. Also it's better to abandon oop and have your threads in one function with a switch loop, and each case calling a single function (then the function calls the classes etc)

you are the best!

well said

Hey cherno loving this as always still waiting a course on algorithms and data structures

The aussie forest background sounds were a vibe

teaches threads in da woods. legend

The code in this video is not thread safe, s_Finished should be atomic, it is perfectly acceptable for the compiler/machine to only do the read once for that boolean value if it can determine it is not changed anywhere throughout that function, in which case it won't see it become true.

Thanks

شرح حلو عاشت ايدك ♥👏

if you print very fast, in background thread, and you don't use std::endl but you use then it goes into new randomly. " " Outputs a newline (in the appropriate platform-specific representation, so it generates a " " on Windows), but std::endl does the same AND flushes the stream.

Threads! Finally!

You should have mentioned Race Conditions which are probably the most common problem with threads. Still nice simple introduction.

I work at home in a room with my pet birds, and they are going NUTS from the bird sounds in the background lol

Dude , you're video is pretty good. The audio quality is fine , you should speak a bit slower and make sure the typing noise will not interrupt too much , and also increase the font, for those of us who use notebook with small screen .

I LOVE YOU AND YOUR CHANNEL IS FANTASTIC IM BRAZILIAN BRO

I almost didn't recognize you until you did the hands :-)

Nice forest!

i'm glad that modern PCs are multicore because in the old days, one could have threaded code that worked but only because all the threads were scheduled on a single CPU (i.e., software threads), getting discrete time slices and not truly running in parallel. The code would then fail on a multiprocessor system surprising the developer. But now we can rigorously test right away. Even release vs. debug builds can differ!

11:15 "Is it done?" LOL

I like the nature

@TheChernoProject will you ever go in to true parallel programing without shared memory. Like how to use MPI for example?

AmaZING! Thank you. Now l can run 2 things together!

Hi cherno , please make video on recursion in c++ & how it works internally.

Thanks for the video, i wonder if boolean variable could be cached and never get new value?

great vid! but there's so much more to talk about threads. You can't mention threads and not talk about mutexes & atomic operations (also next - semaphores, multiprocessing) :) holding on for part #2..

11:16 His camera man says "It's done?" :D

subscribed

EXCEPTIONS Chernobyl

More threading videos!

imagine hiking in woods and seeing guy speaking about threads in cpp

Nice

hey there, hoping for you thoughts on this. wish to make a fake 3d style fps rpg with a physics engine to help simulate abilities like telekinesis and such. wish to build from scratch though not sure of the mathimatical requirments to understand and anything else that would be needed. would be using c++ and not look to make it very complex just enough to simulate what i want. if possible? any suggestions or advice? would the sparky engine in your tutorials work for it?

A would like to know how to raise an event from another thread c++. Could you make an example?

Some questions i have: - How would I make differents thread accessing and updating the same value to always have the most up to date value? - And also, how many threads can I initialize? My pc has 16 threads, so is that the maximun I can start? Or if a start more than that the OS will handle how each thread will run?

A quick tip for people compiling with linux, make sure to add the compiler flag: -pthread

Can this treads be used as Interrupt? My C++ project got safety concern. It need to do interrupt when safety button trigger. Then execute machine stop function & power down machine immediately.

That Resolution, oh boi.

Suspend and resume is also used in a thread loop waiting for an event, state or condition. What it does give up control to other threads the scheduler is managing because even though you have two or more threads you may only have one CPU to run the threads. It is important for real-time multi-threaded programmers to be aware of this. A good example of this is when you come out of a critical region block, you should pause (suspend) which means another thread waiting for the critical region gets the chance to run before the region block releasing thread loops to lock the same region again. Multi-threaded programmers need to think about this aspect in their code. Also how common data is accessed. The differences between atomic operations and mutex-protected data shared between threads. I also like to use thread-local storage to store things like lastError in each thread so each thread has it's own last error. A critical region is used in a function called by many threads.