In embedded (not sure how applicable here?) you invoke a critical section to access a lock. You will have an interrupt handler. Inside that, you will invoke a c

In embedded (not sure how applicable here?) you invoke a critical section to access a lock. You will have an interrupt handler. Inside that, you will invoke a critical section, which prevents other processes from interrupting it. Inside the CS, you an get a handle to a mutex that has shared state. The mutex is what I would call the "lock" in this convention.