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Schedular activation in threads

What is TRUE about the approach called schedular activation in threads ?

(a) The mechanism can be used on multiprocessor
(b) It makes use of mechanism called upcall
(c) Both of the above
(d) None is correct


The goal of scheduler activation are to mimic the functionality of kernel threads. It can be used on multiprocessor where the virtual processor may be real CPUs, there kernel assigns a certain number of virtual processor to each process.

It also makes use of the mechanism called upcall where kernel activates the run time system at a known starting address, in responce to a signal in UNIX.