In multithreaded programming, if we let a waiting thread continuously check whether a condition is met in a loop, and if it is, continue executing the corresponding processing operation, and if not, sleep for a while, can this achieve the same effect as using condition variables? The method of polling with sleep can indeed implement … Read more
1. What is variable scope? The variable scope determines the visibility and lifetime of a variable. In embedded systems, a correct understanding of scope directly relates to memory usage efficiency and system stability. Code Example: // Global variable – visible throughout the program's lifetime int global_var = 0; void func() { // Local variable – … Read more
Follow our official account to keep the embedded knowledge flowing! 1. Can you explain variable scope? The variable scope determines the visibility and lifetime of a variable. In embedded systems, understanding scope correctly directly relates to memory usage efficiency and system stability. Code Example: // Global variable – visible throughout the program's lifecycle int global_var … Read more
Hello everyone, I am the Intelligence Guy~ Most of you must have used condition variables (<span><span>pthread_cond_t</span></span>) in embedded Linux system programming. However, when I first used them, I was not aware of the issue of false wake-ups. You might have suspected this was a bug in Linux, but later research revealed that this is not … Read more