Date: Tue, 25 Jun 1996 16:12:49 -0400 (EDT) From: Bill/Carolyn Pechter <pechter@shell.monmouth.com> To: terry@lambert.org (Terry Lambert) Cc: freebsd-chat@freefall.FreeBSD.org Subject: Re: int link(const int inode, const char *name2) Message-ID: <199606252012.QAA13809@shell.monmouth.com> In-Reply-To: <199606251838.LAA00282@phaeton.artisoft.com> from "Terry Lambert" at Jun 25, 96 11:38:42 am
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> > > > sync;sync;sync > > > > That bit of ancient history is purely psychological. Since sync > > isn't synchronous, after the command returns, your buffers aren't > > all written. However, after you've typed the command twice again, > > odds are they are. :-) > > Actually, 3 sync's is superstition. > Not really, they were a time delay -- the old 11/70's would take a while to sync to the RP04/5/6 or even RK disk drives. Typing sync<cr> sync<cr> sync<cr> with a 300 baud DECwriter gave a significant time delay before hitting the halt switch. The story is sync;sync;sync wasn't good enough -- if the halt switch on the 11/70 was in reach easily... > Two syncs was a trigger for a cache flush on a number of older UNIX > and UNIX-like systems. The second sync would wait, since the kernel > knew that there was a sync pending. > OK, I'll buy this. > One could argue on an old (but active) system, you'd type sync until > it hung for a bit. Maybe the first one was preterbed by loading the > sync code itself? > > > Terry Lambert > terry@lambert.org I still think the third sync was "operator carriage return fill characters." Keep them from hitting the big red switch (or magenta) too soon. Bill ex-11/70 RP04 Board swapper ------------------------------------------------------------------------------- Bill Pechter/Carolyn Pechter | 17 Meredith Drive, Tinton Falls, NJ 07724, 908-389-3592 | pechter@shell.monmouth.com I'll run Win95 on my box when you pry the keyboard from my cold, dead hands. FreeBSD, OS/2, CP/M, RT11, spoken here.
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