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List:       linux-kernel
Subject:    Re: Patch: CLONE_PPID, CLONE_WAIT, CLONE_SUSPENDED
From:       Alon Ziv <alonz () cs ! technion ! ac ! il>
Date:       1999-07-31 20:36:30
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On Sat, 31 Jul 1999, Mike Touloumtzis wrote:

> 
> This appears to be another argument for more flexible
> signal semantics (which are currently being worked on,
> I think).  Suppose you have groups of threads akin to
> process groups.  Deliver a signal to all threads in a
> multithreaded process; then the next one to be scheduled
> will handle the core dump.
> 

No, this is still a no-go.

POSIX signal semantics say that traps go to the faulting thread; only if
they're not handled, the whole process is killed (and leaves a coredump).
So we can't send the signal to other threads in the process before we know
that it should have produced a core dump.

And, besides, at least _my_ plan is to implement the signal semantics
entirely in userspace using existing process group semantics.

	-az

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