Messages in this thread | | | Date | Wed, 10 Jun 1998 09:30:20 +1000 | From | Richard Gooch <> | Subject | Re: [Linux-3D] Try my new DMA kernel functions |
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Alan Cox writes: > > > I care about - firstly mmap /dev/mem, start video grabbing on it, secondly > > > grabbing into the image part of a sys5 shared memory MITSHM block. > > > > sys5 shared memory is stupid and obsolete. It's good to have the > > facility around so that stupid and obsolete programs still work, but > > when considering radical new OS features, we shouldn't design them > > around ancient quirks that no wise programmer will use in new code. > > Stupid, obsolete humm - video folks do DMA to MITSHM X objects because its > FAST, way faster than the alternatives generally available. I doubt they > generally give a hoot about SYS5 v BSD shm arguments at all.
SysV SHM still has advantages over mmap. I'd find mmap much more useful if I could mmap /dev/zero, pass the FD to another process and mmap there and hence share memory between the two.
Regards,
Richard....
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