Everything You Need To Know About Semaphores And Mutexes
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Semaphores and Mutexes are two distinct RTOS synchronization primitives that developers often confuse. Mutexes are designed for shared resource protection and include a critical priority inheritance mechanism, while Semaphores (counting or binary) are for task synchronization and coordination. Using Binary Semaphores in place of Mutexes for resource protection is a common mistake — illustrated by NASA's Mars Pathfinder priority inversion bug — because Binary Semaphores lack priority inheritance. The post also covers RTOS API abstraction layers, recursive mutexes, and best practices for embedded RTOS application design.
