userland shared events & callbacks

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Hi ppl,
i want to use an event to synchronize between a kernel thread and various usermode
processes, the problem is i dont know how do i create userspace<--->kernelspace shared
events, pls point me to anything important.
also, if it possible to make callbacks from kernel to userspace code that could be scheduled
for later execution ( something like NT iocompletion async callbacks, though i m not sure they
r same), i would want to explore that as well. any help or even pointers to kernel source which
i can hack to make such "deferred callbacks" (of course executing under the registering processes
context) would be greatly appreciated.
thanks
amit tikare
 
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Problems cannot be solved at the same level of awareness that created them.
                                                                                       -Albert Einstein
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