Fushuan [he/him]

Huh?

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  • 34 Comments
Joined 1 year ago
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Cake day: July 1st, 2023

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  • Get learning lol. I know that there’s some command line program that gives process info on mouse hover and then that can be parsed with awk to get the pid, then pipe that again into kill -kill. Then use xbindkeys or whatever keybindings program to bind that script to a key.

    Tbh. For involved stuff like this chatgpt will help you more than stackoverflow.






  • I just have a script that repeats the “install-kernel” command and the “bootctl install” one that I run after every big update. It should be fine without them, right? Too many times the kernel one fails in the pacman update chain and I’ve had to chroot from a live USB too many times to do the bootctl install to put the correct bootloaders in the efi partition to skip the manual bootclt install from my actual PC after updates.

    Just in case. It takes 2 seconds vs searching the pendrive, loading, typing in an European keyboard when the live USB asumes it’s american, searching the chroot command on my phone… All of this when I just want to relax. Weird stuff I know.












  • Shared poibters are used while multithreading, imagine that you have a process controller that starts and manages several threads which then run their own processes.

    Some workflows might demand that an object is instantiated from the controller and then shared with one or several processes, or one of the processes might create the object and then send it back via callback, which then might get sent to several other processes.

    If you do this with a race pointer, you might end in in a race condition of when to free that pointer and you will end up creating some sort of controller or wrapper around the pointer to manage which process is us8ng the object and when is time to free it. That’s a shared pointer, they made the wrapper for you. It manages an internal counter for every instance of the pointer and when that instance goes out of scope the counter goes down, when it reaches zero it gets deleted.

    A unique pointer is for when, for whatever reason, you want processes to have exclusive access to the object. You might be interested in having the security that only a single process is interacting with the object because it doesn’t process well being manipulated from several processes at once. With a raw pointer you would need to code a wrapper that ensures ownership of the pointer and ways to transfer it so that you know which process has access to it at every moment.

    In the example project I mentioned we used both shared and unique pointers, and that was in the first year of the job where I worked with c++. How was your job for you not to see the point of smart pointers after 7 years? All single threaded programs? Maybe you use some framework that makes the abstractions for you like Qt?

    I hope these examples and explanations helped you see valid use cases.