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SubjectRe: thread group comments
> The queued exit signal could carry which thread has died. The only tricky
> issue is what to do when the exit signal cannot be queued because there
> are too many threads in flight, in this case it makes sense to just make
> it pending without any data (the thread library can search some global
> data structure in this case)

And where it can and cannot be delivered priviledged. I think you need to
deliver SIGCLD to the real parent unless the proposed target pid is in the same
thread group, uid, gid.

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