547 posts
Hey there. Do you want to take part in building the JH GitLab open source project and become a contributor, but as a newcomer you have no idea where to start? The truth is, anyone can join the JH GitLab open source project and become a contributor — technical background not required.
Not long ago I got accepted into the Cloudflare R2 Storage beta, so I can see it and use it now. Here's my hands-on experience and my take on it.
If you like tearing things apart: this drive served me four years and couldn't be saved. Today I'm taking it apart to show you, letting it give off its last bit of warmth and leaving DIY electronic enthusiasts with some final bits of knowledge.
Every developer's program differs: some handle JSON well, some XML, some plain TXT. So why not just respond in the format you need? ip.renfei.net now returns different formats based on the Accept request header.
A week ago someone kept hammering my traffic — see the post Notice: This Site Was Recently Hit by Malicious Traffic. Today, past 4 a.m., every monitoring channel started howling at me through app, DingTalk, email, and SMS: another scan. Fortunately, having been burned last time, I already had countermeasures ready, so there was essentially no damage.
Starting 2022-04-27 22:18:22, this site came under hostile traffic from a China Telecom residential broadband line in Jinjiang District, Chengdu, Sichuan, China. Here's the post-incident breakdown. Please browse this site normally and politely.
Before discussing volatile we need to understand JMM (Java Memory Model) first. Jumping straight to volatile without JMM feels odd, so let's cover JMM. To guarantee correctness of shared memory (visibility, ordering, atomicity), the memory model defines the rules for read/write behavior in multithreaded programs on shared memory systems.
The classic variable operation is increment: turning 1 into 2. Single-threaded, no problem. But the moment two threads operate on the same variable, trouble appears — that's related to Java's memory model, JMM, which I'll cover in the next article on volatile. If thread A already changed the variable to 2 while thread B increments at the same time without seeing that change and also sets it to 2, two increments should give 3 but give 2 instead. That's what brings CAS in.
Surely you've heard plenty of experts talk about AQS. So what is it? From the name AbstractQueuedSynchronizer we can guess it's an abstract queued synchronizer. Every character makes sense on its own; string them together and it stops making sense. Let's break it apart.
Many people don't know grassroots webmasters exist. I got into the website-building scene back in high school, and I'm one of them. Our crowd runs personal sites, personal blogs, hobby-sharing sites — we're basically the bottom layer of the internet, mostly gathered around shared interests, and most of us will never make a cent.
