brett@lanai.cs.ucla.edu (03/09/89)
I am interested in knowing if you have ANY software
that makes use of System V's shared memory.
Please send to brett@cs.ucla.edu. I will summarize
responses.
brett@cs.ucla.edu,
UUCP: {...sdcrdcf,trwspp,ucbvax}!ucla-cs!bretttim@crackle.amd.com (Tim Olson) (03/09/89)
In article <21499@shemp.CS.UCLA.EDU> brett@CS.UCLA.EDU () writes: | I am interested in knowing if you have ANY software | that makes use of System V's shared memory. I'm not sure if this is the kind of thing you are looking for, but I used shared memory to implement the communication between a "load daemon" and the user-invokable load average reporter on an IBM RT/PC, which didn't have the calculated load averages in the kernel. The load daemon updated, at 1-second intervals, a circular buffer holding the last 15 minutes worth of run-queue sizes. The circular buffer and its associated pointer were kept in a shared-memory segment, so that they could be read by user-level programs to calculate load averages. One benefit of this is that no set-uid program is needed to read the kernel and report load averages. -- Tim Olson Advanced Micro Devices (tim@amd.com)