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SubjectRe: thread group comments
> I don't see how you can do this.  Also on user level you would have to
> do this atomically since otherwise communication between the threads
> isn't possible anymore. We have a PR in the glibc bug data base about
> just that. And I know that there are many other users with this
> problem.

You need to deliver a reserved signal to each thread then spin/sleep until
each one acks the request or dies. Its identical to a TLB shootdown in
the kernel.

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