Re: deferred cancellation of ipc

[Marcus Brinkmann]

On Tue, Oct 14, 2003 at 10:45:46PM +0200, Marcus Brinkmann wrote:
> But that is only the one reason.  The other reason is SMP.  Disabling
> preemption is only atomic within a single processor.  If a thread on another
> processor wants to cancel the next or current ipc of a thread, then
> disabling preemption is not good enough.  The cancelling thread does not
> even know if the other thread runs on the same CPU as itself, or some other
> CPU.

Or does maybe stopping a thread on another CPU count as preemption and is
also delayed?

Thanks,
Marcus

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Marcus Brinkmann              The Hurd http://www.gnu.org/software/hurd/
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