Messages in this thread | | | Date | Mon, 15 Dec 2003 14:55:38 -0800 | From | Roland McGrath <> | Subject | Re: [patch] Re: Problem with exiting threads under NPTL |
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> On Sun, 2003-12-14 at 23:10, Linus Torvalds wrote: > > > Even though the parent ignores SIGCHLD it _can_ be running on another CPU > > in "wait4()". > > which fwiw is a case of illegal behavior in the program ... of course > the kernel shouldn't die if it happens.
No, it is legal to call wait* when ignoring SIGCHLD--and it is required to return ECHILD for the dead ones. For example, using waitpid with WNOHANG is a valid way to poll for the liveness of a child (though there is no good reason why an application wouldn't just use kill(,0) for that). It's not a method that has anything to recommend it, but it is perfectly valid and the range of permissible results is well-specified. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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