In the world of concurrency, sometimes what traps you is not others, but yourself. <span>recursive_mutex</span> <span>mutex</span> is the most basic and commonly used magic door. Regarding this category, C++ provides us with more options. Today, let’s take a look at <span>recursive_mutex</span>! 1. The Illusion of Deadlock 🪤 Imagine a task that rewards you with 100W💰 … Read more
C++ multithreading programming has always been a highly technical topic. It can bring significant performance improvements, but improper handling of details can lead to serious issues. With the popularity of multi-core processors, many developers choose to introduce multithreading to optimize program performance when facing compute-intensive tasks. However, C++ multithreading programming is not as simple as … Read more
1. Introduction In the process of writing projects, multithreading is often involved. Programming multithreaded applications usually involves issues of thread safety, which is why mutexes are often used to ensure thread safety. However, the use of mutexes can often lead to another problem: deadlocks. A deadlock, simply put, occurs when there are two shared resources, … Read more
1 Deadlock std::mutex mtM,mtN;int M = 0;int N = 0; void threadA() { std::lock_guard guardM(mtM); std::lock_guard guardN(mtN); M++; N–;} void threadB() { std::lock_guard guardN(mtN); std::lock_guard guardM(mtM); M–; N++;} This is a typical example that can lead to a deadlock. The classic two-phase locking issue is immediately apparent, but when more locks are involved, the problem … Read more
Intelligent Terminal Control System, “Mysterious Freeze” After Running for Several Hours We developed an intelligent gateway based on STM32 + FreeRTOS for a client, featuring: Multithreaded tasks: sensor data collection, CAN communication, UI refresh, log writing Using mutexes to protect shared resources (such as LCD, Flash, serial port) Priority design was reasonable (or so we … Read more
When programming in C++ under the Linux environment, multithreading provides excellent concurrency capabilities, allowing programs to perform more efficiently when handling complex tasks. However, multithreaded programming is not without its challenges; deadlock issues lurk like hidden “killers,” potentially causing programs to become stuck. Once a deadlock occurs, the program is trapped in an unbreakable loop, … Read more
1. Introduction: When the “Two Wires” Suddenly “Stop Working“ In the daily work of embedded engineers, the I2C bus, with its two-wire communication feature, is a prime example of “minimalist aesthetics“. However, this seemingly simple two-wire system can suddenly fall into a “deadlock“—the clock line (SCL) stubbornly remains high, while the data line (SDA) is … Read more
Click the aboveblue text to follow us The I2C bus, as a widely used communication protocol in embedded systems, has its stability and reliability directly affecting the overall performance of the system. An I2C deadlock refers to a situation where the bus is stuck and unable to continue communication, usually caused by a slave device … Read more
How To Fix And Prevent Buffered Streams Deadlock Rust has eliminated various stupid bugs and traps that are common in other languages, making it easier to develop and maintain our projects. Unfortunately, when it comes to common problems in asynchronous programming, Rust is not inherently as strong. In fact, asynchronous programming in Rust is much … Read more
Welcome FPGA engineers to join the official WeChat technical group. ClickBlue TextFollow us at FPGA Home – the largest FPGA engineer community in China Generally, there are no issues with soldering I2C devices; following the device manual step by step usually leads to success. However, if such a simple thing fails to yield the desired … Read more