From NSNotificationQueue Documentation:
NSPostASAP
The notification is posted at the end of the current notification
callout or timer.
NSPostWhenIdle
The notification is posted when the run loop is idle.
NSPostNow
The notification is posted immediately after coalescing.
Since a run loop is a closed loop, I always get confused about what is
the "end", and when it is idle. I guess the "notification callout" is
the part in the run loop when notification inputs are processed and
sent, but I'm not sure when that is, in relation to "coalescing".
In actual practice, I'm a dummy and think like this:
1. I have a hypothesis that a notification is getting posted too
early relative to other stuff, so I want to delay it and see if things
work better.
2. I have a hypothesis that a notification is getting posted too late
relative to other stuff, so I want to make it happen earlier and see
if things work better.
In my experience, it seems that the order of the above three styles
from earliest to latest, is:
1. NSPostNow
2. NSPostASAP
3. NSPostWhenIdle
Is that true? If someone can confirm, I shall file a bug and ask
Apple to put them that way in the documentation.
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