4 ms·
What about other messages though? The question isn't usually limited to one message in isolation, it's related to the state of the system as a whole. So sure, t
by YZF 2y ago
What about other messages though? The question isn't usually limited to one message in isolation, it's related to the state of the system as a whole. So sure, trivially, setting one bit where that bit is never cleared can only be done once, so any process setting that bit is also trivially (and not very usefully?) "exactly once delivery".
- mgsouth 2y agoOn the contrary, that is an extremely useful process, and is the basis for vast swathes of multiprocessing algorithms (such as "has this thing finished initializing", or "has it been freed"). However, it is "at most once", not "exactly once". The bit may never be set.
- YZF 2y agoFair enough. A single bit that can only get set can indeed be useful.