.All processes share a semaphore variable mutex, initialized to 1. Each process must execute wait(mutex) before entering the critical section and signal(mutex) afterward.Suppose a process executes in the following manner;wait(mutex)critical section;wait(mutex)several processes maybe executing in their critical sectionall of the mentioneda deadlock will occurprocesses will starve to enter critical section

Arduino FreeRTOS Tutorial 3- Using Semaphore and Mutex in FreeRTOS with Arduino

Arduino: FreeRTOS Mutex tutorial - Priority Inversion & Priority Inheritance