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An approach to estimating the blocking factor impact on feasibility of software applications in real-time systems on multi-core processors is described. An option for compound blocking to occur is demonstrated for the priority inheritance protocol as well as for other known protocols for access to shared resources. A method to estimate the impact of chained blocking on feasibility of particular application tasks and the application as a whole is described. A method to estimate the blocking factor value for systems with compound and chained blocking on multi-core processors is presented.