Re: SCO: "thread creation is about a thousand times faster than on native Linux"

From: Alan Cox (
Date: Thu Aug 24 2000 - 13:21:31 EST

> On Thu, Aug 24, 2000 at 02:01:55PM +0200, Andi Kleen wrote:
> > POSIX wants to send the signal to the first thread in the group who
> > doesn't have it blocked.
> To _any_ thread in the group that does not have it blocked.

Any-single or any-all ?

See you need to send them to a predictable thread for real time signals to
preserve queue time order semantics on signal queues. Otherwise you just
broke the entire asynchronous I/O model

> > Several signals are special cased in POSIX, e.g. SIGSTOP, and need to
> > handled by all threads in the group.
> I think that logic needs to be in the root thread.

The root thread cant catch SIGSTOP and reprocess it

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