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Date: Mon, 21 May 2007 20:48:50 +0200 From: Eric Dumazet <dada1@...mosbay.com> To: Ulrich Drepper <drepper@...hat.com> CC: Linux Kernel <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org> Subject: Re: second, bigger problem with private futexes Ulrich Drepper a écrit : > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Eric Dumazet wrote: >> Do you mean POSIX allowed to mix PROCESS_PRIVATE and PROCESS_SHARED >> condvar and mutexes ? Seems silly to me :( > > Don't judge what you don't understand. Yes, I kindly apologise for this crime. > If all waiters are always in one > process but the notifiers can be in different processes, this setup > might make a lot of sense. Thanks for providing this information. I assume in this case the condvar is PSHARED, while mutex could be/is PRIVATE ? I wonder how old (assuming all shared) code could work, since the notifier would call FUTEX_CMP_REQUEUE giving a target address outside of this process vm ? My understanding (probably bad, since I know nothing about POSIX as you mentioned) - Old code could not use FUTEX_CMP_REQUEUE if mutex was private. -> Old code was using a normal FUTEX_WAKE in this case. So I repeat my question : Should we really add yer another futex command in kernel for a corner case ? Thanks - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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