Primarily your point 2, that is, CLONE_PID is supposed to be the flag
that indicates when a set of tasks (at least) share a common signal
delivery queue.
It may imply other things, such as the effect of exit. Currently this
is handled with some particularly ugly atexit hooks; it would be nice
for things to be done cleaner.
It is nice to see that someone is actually working on this.
r~
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