> Yeah, I used a wrong term when was asking about "callback". Actually I need
asynchronous notification, so I can pend a task on some primitive like a semaphore. Semaphore is not a good choice to OS/application signaling due to memory access issues in some build configurations. And semapores are not easilty shareable in the case of multiple waiters. Again, a signal is what you want. Your applications can wait on a signal primitive for any mount related event to occur. This is the strategy used everywhere and is intended just for what you are doing.
