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SubjectRe: what is the most efficient wakeup method (signals,msgs,semaphores) ?
> I'd like to hear your opinions on the efficiency for the IPC mechanism 
> betweeen two processes. (from a kernel point of view)

Have you read "Unix Network Programming, Volume 2, 2nd edition: IPC"
by Richard Stevens? It has measurements for this kind of thing
on two OS's, and you can run the tests yourself on your favorite OS;
the code is probably at http://www.kohala.com
- Dan
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