In-Depth Analysis of Linux SMP Technology: From Principles to Practice 1 Basic Concepts of SMP Symmetric Multiprocessing (SMP) is a computer architecture technology that integrates multiple processors into a single system. Its core feature is that all processors work together in a peer-to-peer manner within a single operating system, sharing a unified memory space and … Read more
Introduction In practical embedded project development, have you ever encountered the dilemma of needing multiple tasks to work together but not knowing whether to use global variables, message queues, or semaphores? An improper choice may lead to slow system response, data contention, or even deadlocks. This article will systematically outline the inter-task communication mechanisms in … Read more
1. Introduction: Why is Happens-Before Necessary? In multithreaded programs, “statement order” ≠ “execution order”.Modern CPUs and compilers can reorder instructions as long as the results in a single thread remain unchanged, allowing for free optimization.However, in concurrent scenarios, this can lead to serious issues: bool ready = false;int data = 0; void writer() { data … Read more
The client provides you with an intranet clock address, requesting that “the server time must match it exactly!” Don’t panic, this step-by-step tutorial will help you synchronize with the client’s clock with zero error in just 5 minutes. 1. First, clarify: What did the client provide? The address provided by the client, similar to <span>10.x.x.x</span>, … Read more
A Trio of Concurrency in Rust:<span>Join</span>、<span>Arc<Mutex></span> and <span>mpsc</span> Channel Synchronization in Practice Concurrency is one of Rust’s core advantages, but handling shared state and thread communication has always been a challenge in programming. Rust, with its ownership system and unique synchronization primitives, makes multithreaded programming safe and efficient, completely eliminating common issues like data races … Read more
Task notifications are a lightweight inter-task communication (IPC) and synchronization mechanism provided by FreeRTOS. Each task has a built-in “notification value” that can be sent directly to a specified task, avoiding the use of heavier objects such as queues, semaphores, and event groups. The characteristics include no involvement of object allocation, deallocation, and intermediate data … Read more
1. Introduction The design of the reset tree for SoC (System on Chip) is a critical aspect that ensures the chip can reliably start and recover under various conditions. The reset tree, as a crucial yet often overlooked infrastructure within the SoC, is responsible for safely, reliably, and orderly transmitting reset signals generated externally or … Read more
In FPGA design, handling cross-time domain (Cross-Time Domain, commonly referred to as Cross Clock Domain CDC) is a key technology to ensure reliable signal transmission between different clock domains, with the core issue being the resolution of the metastability problem. 1. Single Bit Signal Crossing Domain: Two-Stage Synchronizer This is the most basic method, suitable … Read more
1. Introduction The design of the reset tree for SoC (System on Chip) is a critical aspect that ensures the chip can reliably start and recover under various conditions. The reset tree, as a crucial yet often overlooked infrastructure within the SoC, is responsible for safely, reliably, and orderly transmitting reset signals generated externally or … Read more
SemaphoreWe all know about queues, which can be used to transmit different types of data.However, sometimes we only need to convey a state without transmitting specific information.Thus, we introduce semaphores, which do not transmit data but rather convey states, serving as notifications and saving memory. A semaphore cannot transmit data; it only has a count … Read more