Re: [patch] Re: Problem with exiting threads under NPTL

[Linus Torvalds]

On Sun, 14 Dec 2003, Ingo Molnar wrote:
>
> are you sure this can happen? eligible_child() does this:

Interesting. That code should have been enough, but we've later on added
extra code into wait_task_zombie to check _exactly_ the same case because
we saw problems.

Hmm.. Maybe that was to protect against concurrent wait4()'ers (which can
happen - the wait case only takes the read lock). Threads can wait for
each others children, after all.

		Linus
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