Date: Sun, 1 Jul 2001 04:00:34 -0500 From: Alfred Perlstein <bright@sneakerz.org> To: "E.B. Dreger" <eddy+public+spam@noc.everquick.net> Cc: "Michael C . Wu" <keichii@peorth.iteration.net>, freebsd-smp@freebsd.org, freebsd-hackers@freebsd.org Subject: Re: Quick question: AIO / SMP / process-based threading Message-ID: <20010701040034.G84523@sneakerz.org> In-Reply-To: <Pine.LNX.4.20.0107010345230.29177-100000@www.everquick.net>; from eddy%2Bpublic%2Bspam@noc.everquick.net on Sun, Jul 01, 2001 at 03:51:10AM %2B0000 References: <20010630222829.E84523@sneakerz.org> <Pine.LNX.4.20.0107010345230.29177-100000@www.everquick.net>
next in thread | previous in thread | raw e-mail | index | archive | help
* E.B. Dreger <eddy+public+spam@noc.everquick.net> [010630 22:51] wrote: > > Date: Sat, 30 Jun 2001 22:28:29 -0500 > > From: Alfred Perlstein <bright@sneakerz.org> > > > > Can you point to some specific PRs about this or crashdumps before > > (or at least while) taking pot shots at the AIO implementation? > > In the mean time, until somebody can substantiate that claim... is AIO SMP > safe? I see that aiocb.aio_buf is declared as "volatile", so I would > presume so. > > I just want to be sure that, if an aio call runs on one CPU, another CPU > can access *aio_buf and be 100% certain that the data are coherent. > It should be, if you experience any problems please let us know. > aio_buf = mmap() using MAP_HASSEMAPHORE -- good idea, bad idea, pointless? Pointless I think. -- -Alfred Perlstein [alfred@freebsd.org] Ok, who wrote this damn function called '??'? And why do my programs keep crashing in it? To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20010701040034.G84523>