You can't pass that to the thread.

So this is where I am stuck now.

What is print?

What is print?

Like puts() but without newline

So this is where I am stuck now.

Try this one: char *newstack = (char *)mmap(NULL, 8392704, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0);

Try this one: char *newstack = (char *)mmap(NULL, 8392704, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0);

What is map()?

What is map()?

mmap I meant.

Try this one: char *newstack = (char *)mmap(NULL, 8392704, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0);

And what is 8392704?

That's for 8 MB stack.

That's for 8 MB stack.

Damn that's huge lol

Reduce it if you want to.

Reduce it if you want to.

Ah okay.

However, this does not mean your thread will consume 8 MB physical memory for the stack.

However, this does not mean your thread will consume 8 MB physical memory for the stack.

? 🤔

? 🤔

mmap allocates virtual memory. It is only physically used when you read/write to it.

class A { void display(){ sop("test"); } } public class Main { psvm(...) { A a1 = new A(); a1.test(); // 1 new A().test(); // 2 } } What is the difference between 1 and 2?

So for example you map 10 MB of memory. You only read 10 bytes, it only uses 10 bytes physical memory. Not really sure about the calculation, but that is the simple illustration.

Lol

class A { void display(){ sop("test"); } } public class Main { psvm(...) { A a1 = new A(); a1.test(); // 1 new A().test(); // 2 } } What is the difference between 1 and 2?

Second one is kinda strange Because you need to delete after

mmap allocates virtual memory. It is only physically used when you read/write to it.

Ah but it's allocated

Second one is kinda strange Because you need to delete after

Sorry I didn't get it?

Ah but it's allocated

Allocated does not mean physically uses the memory.

For example, malloc(1024*1024*1024) won't make your program directly consume 1 GB of memory. It only uses 1 GB of memory if your program read/write to that allocated memory.

For example, malloc(1024*1024*1024) won't make your program directly consume 1 GB of memory. It only uses 1 GB of memory if your program read/write to that allocated memory.

What?

So for example you map 10 MB of memory. You only read 10 bytes, it only uses 10 bytes physical memory. Not really sure about the calculation, but that is the simple illustration.

Depends on where you read those bytes from write those byte to

What?

As what I say, which part I need to explain more?

But for a simpler example, you write 1 byte, and 4 KB of physical memory will be allocated (for the page you wrote that byte to)

if the page size is 4 KB on the target platform

if the page size is 4 KB on the target platform

Oh I see, so it depends on the page size.

Oh I see, so it depends on the page size.

Virtual memory is managed in pages, yes

As what I say, which part I need to explain more?

The part "It only uses 1 GB of memory if your program read/write to that allocated memory.". It's a bit confusing. Are you saying that I can do the following on a machine with 2GB of RAM? x = malloc (1GB) y = malloc (1GB) z = malloc (1GB)

The part "It only uses 1 GB of memory if your program read/write to that allocated memory.". It's a bit confusing. Are you saying that I can do the following on a machine with 2GB of RAM? x = malloc (1GB) y = malloc (1GB) z = malloc (1GB)

Yes.

what's the C telegram group for sharing ugly code?

The part "It only uses 1 GB of memory if your program read/write to that allocated memory.". It's a bit confusing. Are you saying that I can do the following on a machine with 2GB of RAM? x = malloc (1GB) y = malloc (1GB) z = malloc (1GB)

what's the C telegram group for sharing ugly code?

http://t.me/c_cpp_india

The decision of using large chunks or small chunks depends on the mmap threshold, this can be configured with constant option called M_MMAP_THRESHOLD.

You can search for that constant to explore more.

By default, malloc(1024*1024*1024) will always use mmap. Since DEFAULT_MMAP_THRESHOLD_MAX on: > 32-bit systems is 512*1024. > 64-bit systems is 4*1024*1024*sizeof(long).

Except you modify the threshold.

I just realized it is mentioned on man 3 mallopt.

Thanks, I learnt something new today. https://stackoverflow.com/questions/10966121/when-should-errno-be-assigned-to-enomem

http://t.me/c_cpp_india

that was smooth af

Thanks, I learnt something new today. https://stackoverflow.com/questions/10966121/when-should-errno-be-assigned-to-enomem

This is different topic, but related. However, I just learned about /proc/sys/vm/overcommit_memory after reading this. Nice sharing, thanks.

http://t.me/c_cpp_india

Guys, I've got a byjus ias tab, but it's locked and I can't access anything other than the course in it, can someone help me use the tab for other purposes

Guys, I've got a byjus ias tab, but it's locked and I can't access anything other than the course in it, can someone help me use the tab for other purposes

wrong group

http://t.me/c_cpp_india

Lol

I just learnt how to write a makefile and it looks well but when I type "make" in my VS Code terminal,it doesn't recognize the command.Can someone pls help me with this?

I just learnt how to write a makefile and it looks well but when I type "make" in my VS Code terminal,it doesn't recognize the command.Can someone pls help me with this?

Either install all the stuff by hand or use an operating system that is made for development

Im using Windows

Im using Windows

Sad

Im using Windows

Install by hand then

Too bad

Sad

Pls why is that?

Install by hand then

How should i do it then?

Pls why is that?

Windows is an operating system that limits your creativity in programming and has no proper package manegement

How should i do it then?

Let me spoon-feed you with a link

I just learnt how to write a makefile and it looks well but when I type "make" in my VS Code terminal,it doesn't recognize the command.Can someone pls help me with this?

The make command is a GNU project

You can either use some reimplementation, such as the one by Visual Studio, or use a port such as the one in Cygwin

Let me spoon-feed you with a link

AG7💛 https://stackoverflow.com/questions/32127524/how-to-install-and-use-make-in-windows#32127632

AG7💛 https://stackoverflow.com/questions/32127524/how-to-install-and-use-make-in-windows#32127632

Thank u

Thank u

Next time visit your favorite search engine and type in your question before asking here

How should i do it then?

Install linux or bsd on a side disk and use that system as a dev environment. You can still have dual boot and use windowze for gaming and stuff

Hi

Hey 👋

Hey 👋

Hi there how are you?

Install linux or bsd on a side disk and use that system as a dev environment. You can still have dual boot and use windowze for gaming and stuff

Windows Subsystem for Linux will do the trick without dual boot. Just go to Windows Store app and search for "Ubuntu"

Hey guys idk how pointers work, can you suggest me some good sources to learn?

Windows Subsystem for Linux will do the trick without dual boot. Just go to Windows Store app and search for "Ubuntu"

I already do that, it's pretty simple

Windows Subsystem for Linux will do the trick without dual boot. Just go to Windows Store app and search for "Ubuntu"

Oh, completely forgot about this way. You're right

Guys

Guys

I'm a completely beginner with programming I want to know, your personal opinion about it and if you can tell me how to became better

Hey guys idk how pointers work, can you suggest me some good sources to learn?

/get cbook

Thank you!

Thanks for the ebook

Buuut I ask I you can tell me about it,

Buuut I ask I you can tell me about it,

Asking about opinion is mostly going no where since each of us has different point of views. You want to learn to code, then practice. A lot. Read how the language works, learn algorithms, focus on one thing... it takes time. Shortcuts endup being useless. "learn how to code in 48 hours" are scam tutorials. I had a teacher that told me once "Learn how to program well, takes about ten years of daily work. Don't rush." I agree with it, but some people don't

Hi there how are you?

I'm fine 😊, wbu?

I'm fine 😊, wbu?

Nice

Asking about opinion is mostly going no where since each of us has different point of views. You want to learn to code, then practice. A lot. Read how the language works, learn algorithms, focus on one thing... it takes time. Shortcuts endup being useless. "learn how to code in 48 hours" are scam tutorials. I had a teacher that told me once "Learn how to program well, takes about ten years of daily work. Don't rush." I agree with it, but some people don't

Ok.. Thankyou

hi guys, could you help me with codewars 4 kyu? I've done with it, but I have 1 warning because of compiler I guess. I was trying to google that warning, but only found suggestion about "return 0" in main() function (codewars have no main() in yourself tasks :\) and something about -Wall (codewars have no possibility to setup compiler args too :\). Code is here: https://pastebin.com/mdXFnQYA and yeah, code is a bit strange because that task requires to not use function like stoi, atoi or boost, so I had to write function like this