Help me understand PIDController::OnTarget()

[jwakeman]

Originally Posted by wireties

the first is a semaphore used for mutual exclusion (to protect the critical region), in this use-case the semaphore is taken before and given after a critical region of code and always in the same context - the semaphore includes the concept of ownership (by the thread/task) and recursion

the second is a semaphore used for synchronization, in this use-case the semaphore is taken in one context/thread/task and given or flushed in another context - for example given/flushed in a periodic timer callback function (or maybe an interrupt service routine) and taken in a task/thread

I figured. So in QNX parlance (which I am most familar with) these would be a Mutex and Condition Variable. However, I don't see where the semaphore is being flushed in the PIDController implementation. The periodic loop is accomplished with a Notifier calling the Calculate() method periodically. Is the sync actually being used somehow here?