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Comparing two remote threads?

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linux-howto

http://stackoverflow.com – I am implementing an application which executes two programs in lockstep. Each system call is a synchronization point. An application might have more than one thread, thus I need to identify unequivocally each of them in order to synchronize the execution of a thread from the first application with the execution of the same thread in the second application. Is there a way to identify if two remote threads are executing the same code or function? Every suggestion is welcomed!! :D (HowTos)