Understand these three programming tools from a practical perspective to make your embedded code more elegant and efficient! 🎯 Introduction: Why Learn to Use Them Together? Imagine you are managing a smart home system: • Structs are like a storage box that neatly organizes related items together. • Unions are like a transformer that can … Read more
Today, I would like to discuss a phenomenon related to the memory of Siemens PLCs. This concept is a fundamental knowledge point that is typically covered when learning about PLCs, often taught by instructors or institutions. However, many people may not pay much attention to it in actual projects.Phenomenon: Last year, during a renovation project … Read more
Source: Linux Technology Enthusiast A deep reflection triggered by a production incident, a heartfelt summary from a veteran with 5 years of operations and maintenance experience. Introduction: That Friday Night That Kept Me Awake Do you remember that Friday night? Just as I was about to leave work, I received a monitoring alert: the CPU … Read more
Pointers are the essence of the C language. Understanding memory can help better comprehend and learn about pointers. Before learning about pointers, it is advisable to refer to the Von Neumann architecture and the simple example of the Von Neumann architecture, as well as the basic understanding of operating systems. When you run a program, … Read more
A Debugging Story At 2 AM, Xiao Li was working overtime debugging an IoT sensor project. The device inexplicably restarted after running for a few hours, and the error logs pointed to a memory access exception. After several hours of investigation, he finally pinpointed the source of the problem: // Problematic code char *sensor_names[10]; // … Read more
Virtualization technology has matured significantly today, thanks to the active participation of major internet companies. It relies on the Hypervisor to map virtual resources (such as vCPU, virtual memory, virtual devices, etc.) to the physical resources of the Host, thereby providing multiple virtual machine resources and maximizing hardware resource utilization. For instance, the VxLAN technology … Read more
A Comprehensive Guide to C++ Smart Pointers In modern C++ programming, smart pointers are essential for managing dynamic memory. They help prevent memory leaks and dangling pointers, which are common issues in manual memory management. Types of Smart Pointers There are three main types of smart pointers in C++: std::unique_ptr: This smart pointer maintains exclusive … Read more
Resource Limits The Linux kernel has protective mechanisms to prevent processes from consuming excessive memory. Since BPF maps can consume a significant amount of memory, they are also subject to these mechanisms. rlimit (Resource Limit) <span>rlimit</span> (resource limit) is a system mechanism used to track and limit the amount of specific resources that a process … Read more
HeliOS is an open-source, free embedded multitasking kernel designed for various low-power embedded devices. It provides a rich, well-documented API that allows for fine control of the system and access to kernel services (system calls), enabling functionalities such as task management, scheduler management, inter-process communication, memory management, and device management, all while maintaining a minimal … Read more
Code XiaobianMillionFans CertifiedAccount By clicking follow, you not only gain a tool for finding resources but also an interesting soul ▶ ▶ ▶ Memory is a great helper for C/C++ programmers. One of the reasons we often say that C/C++ programs have higher performance is that they allow for manual memory management. However, memory issues … Read more