Re: kernel thread support - LWP's
Linus Torvalds (torvalds@transmeta.com)
19 Jul 1999 01:45:18 GMT
In article <Pine.SOL.4.05.9907172226570.25819-100000@csa.cs.technion.ac.il>,
Alon Ziv <alonz@cs.Technion.AC.IL> wrote:
>
>I remember someone (David Wragg <dpw@doc.ic.ac.uk>) once mentioned another
>new flag idea: a CLONE_SIBLING flag, which will mean that if the new
>thread does a clone() the new thread will get the same ppid of the parent.
>This (together with the redefinition of the manager thread, above) will
>mean that all of the threads report directly to the manager, and any
>thread may create another thread _without_ communicating to the manager
>(it just creates a new sibling).
This sounds like a Good Idea(tm).
It's also a lot more straightforward as a concept than is the notion of
CLONE_PID, which never got really implemented because it has a ton of
subtle issues (I think that CLONE_PID will basically always just remain
useful for the initial kernel threads, and what pthreads needs in
addition to the CLONE_SIBLING flag is a CLONE_SIGNALS thing).
Linus
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