From mboxrd@z Thu Jan 1 00:00:00 1970 From: clemc@ccc.com (Clem Cole) Date: Wed, 1 Feb 2017 12:18:47 -0500 Subject: [TUHS] shared memory on Unix In-Reply-To: <1b4095d8-047e-fa23-fc34-b1f8eb5c9d02@mhorton.net> References: <1b4095d8-047e-fa23-fc34-b1f8eb5c9d02@mhorton.net> Message-ID: ​I do not remember the BBN share memory code, but the Columbus shared memory and semaphore changes were certainly known in 1978 and 1979. I remember seeing a man page for them from one of the OYOC types - Phil Karn maybe, but its possible it was tjk. As quick scan of my paper archives, did not turn anything up; and I do not remember any system at CMU that had the code, only looking at a hard copy of the man pages. My memory is that the API changed a little by the time they became the System V API; as I remember thinking that the IPC was "new" when I first saw it in a system that had all three. On Wed, Feb 1, 2017 at 11:21 AM, Mary Ann Horton wrote: > I*'m not sure what you mean by CB3, but these features (shared memory, > semaphores, IPC) were added to CB-UNIX (Bell Labs, Columbus) precisely > because they were needed in real time telco systems and not preset in the > versions from New Jersey. This would have been in the early 1980s. When I > got there in 1981 I think CB-UNIX was already well established and had > these features. (These would show up, ironically, in /usr/ucb, which did > not stand for Berkeley.) > > Mary Ann > > > > On 02/01/2017 06:18 AM, Paul Ruizendaal wrote: > >> The presence of some sort of shared memory facility in the >> BBN V6 Unix kernel got me thinking about the origins of >> shared memory on Unix. >> >> I had a vague recollection that primordial versions were present >> in either PWB or CB3, but a quick glance at the source indicates >> that this is not correct. >> >> What are the origins of shared memory on Unix, i.e. what came >> before mmap() and SysV IPC? Was the BBN kernel the first to >> implement such a facility on Unix? >> >> Paul >> >> > -------------- next part -------------- An HTML attachment was scrubbed... URL: