Відео

u should put arguments in wait() func. just leave it in NULL.

these are really the best videos on C out there. thank you so much!

How come you don't cast the variable "a" to void pointer inside of pthread_create function (line 25 when all the code is ready)? Just like you cast the address of the variable "r" to double void pointer inside of pthread_join function on line 32?

Best explanation of this topic on the entire internet.

Thank you ,this is exactly what i need for my OS homework and teachers wont tell it at class

The example on the video was the exact problem I was facing and how I solved it 🥹 Basically I had a function returning a pointer to another pointer wich already had memory allocated to it. The program would crash at random points because of it. Now I just use strdup on the string and use the void function to modify it. It would be best if the debugger would point out my stupid mistake. I hope it was the issue, I still have to test the program when I am done rewriting it.

Thanks

Thanks so much man I got these type of error soo much that I thought to switch to C++ because it uses <iostream>. Thank you so much, I will subscribe you!!!!😄😁😇

Thank you for the video I definitely learn a lot from you. I think one important thing to mention too is that declaring the malloced int* also needs to happen inside the loop or else you you would pass the same pointer and free would free the value sometimes before other threads can use it. I had the same setup but assigned into an int of a struct and had double freeing issues because of this. Still trying how to figure out a way around this though while passing struct if there are any ideas I am all ears. :)

saved me from 2 hours of useless lecture

Thank you so much. You explained it really well, but I have a question: What if I only want to save the age and gender in variables, but not the name? I tried to use "{ \t\"name\": \"[^\"]+\", \t\"age\": %d, \t\"gender\": \"%c\" }" as PERSON_FORMAT_IN and fscanf_s(file, PERSON_FORMAT_IN, &p2.age, &p2.gender) function, but it doesn't work. I think it has something to do with the "+" symbol. I'm not really sure of that. How would I solve it? Thanks in advance.

Why does my teacher inquire us to use pointers and structs for this. This was ideal thank you

thank you so much

Great video, thanks I subbed after watching this.

Wonderfully explained. Thank you sir.

Bravo, frate. Super tutorial. Felicitări !

Apparently there's another way of initializing a pthread_mutex: pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; I wonder what the difference is

I approve of cooking pots.

This code doesn't look clean to me since you don't handle a possible failure auf execlp... - the program will hang if you substitute "ping" by "pong" (or delete /usr/bin/ping on your system)...

i'm 30 seconds into the video and i already know this guy is about to spit some facts

Holy shit this blew my mind that you can do it this way. Poahhh well explained good sir

This is interesting that every process has a parent save for 0 so I guess 0 is the kernel or something ? I guess I would find out next semester with the dreadful Operating System course 😂

you don't actually need to pass a pointer to a function, just the function name should be enough. At least in c99.

OMG I love you so much !!! You just saved my life

00:00 - Introduction to inter-process communication and the purpose of the video. 01:20 - Explanation of pipes as a method of inter-process communication. 02:40 - Basic syntax and functions for creating pipes in C. 04:15 - Demonstration of creating a pipe in C with a simple example. 06:00 - Discussion of reading from and writing to pipes. 07:30 - Example of parent-child process communication using pipes. 10:00 - Handling errors and closing pipes. 12:00 - Summary and conclusion.

Thank you for the vid.... and showing the syntax. It's such a weird execution flow... not natural at all. I'm still trying to wrap my mind around that.

Welcome back

Thank you for this video. It was presented very cleary and understandably.

Great explanation. Cheers!

Great video man im learning so much from you thank you!

how about calling wait() inside the curly braces for "else", before making n = 6? That way you save the if (id != 0).

Hey! I like your videos! The only thing I suppose was wrong in that one is that your doesn't close the descriptor in case of write or read error and return straight away

great lesson hairline man

U are GOAT🫡

Piola👍

Piola👍

thank you so much for these videos, i literally have an exam in 2 days and my prof makes everything seem so complicated, you literally saved me. i have a question tho, just out of curiosity, are you romanian? you kinda give me that vibe.

I have one question. How make a function which returns a string but not only some dummy string, string with parameters. So how to make a function which have for example one string and one int as parameters and return string which have those two parameters?

If you don't wanna malloc stuff typedef struct s_elements { int *array; int a_index; pthread_mutex_t m1; } t_elements; void *routine(void *elements) { t_elements *new_elements = (t_elements *)(elements); pthread_mutex_lock(&new_elements->m1); printf("%d ", new_elements->array[new_elements->a_index]); new_elements->a_index += 1; pthread_mutex_unlock(&new_elements->m1); return NULL; } int main(void) { pthread_t t[10]; t_elements elements; int primes[10] = {2, 3, 5, 7, 11, 13, 17, 19, 23, 29}; elements.array = primes; elements.a_index = 0; pthread_mutex_init(&elements.m1, NULL); for(int i = 0; i < 10; i++) pthread_create(&t[i], NULL, &routine, &elements); for(int i = 0; i < 10; i++) pthread_join(t[i], NULL); pthread_mutex_destroy(&elements.m1); }

drari dyal 1337 kanchofkom

I just thought about the wait() in the if statement: is it necessary?

22 😅

If you are here from 42 👍😉

hey dude I am sorry I did not reply to you earlier but this is the problem exactly: So the problem is with files taking some input , the code is let's say : #include<stdio.h> int main() { int d ; printf("Enter age."); scanf("%d",&d); printf("%d",d); return 0; } Now when I run this in the nppexec console following all your instructions, nothing happens , there is just a cursor blinking, so I type something on the keyboard(say 2) and press enter , then it prints : Enter age.2 Why is it not printing the prompt first and then taking input ? In case multiple inputs in the code , what it does is that it takes all the inputs first , then prints the prompt printf statements , skips the scanf statements and gives the output .

Is the function 'wait()' nessecerry after 'kill()' function, If so why do we need 'wait() function' ?

Ty

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I find this approach the easiest, yes, but not the most reliable. I wish you had used a union or packed the struct, then dumped it to a file and reloaded it.

Fantastic video to learn such a complex concept.

Thanks for the clear instructions and good code example. It's highly recommended for beginners like me to further study how to properly end the thread pool after all tasks finished on ChatGPT.