The authors are developing a unified OS which provides superior real-time response and versatile functionality simultaneously. To accomplish both features, this OS consists of two kernels. One is called nu -kernel and has large number of system calls (about 130). The other is called p-kernel and is characterized by short interrupt masking time (maximum 15 mu sec). The nu -kernel is compressed into a task in the p-kernel in order to achieve short interrupt latency. Using facilities of inter-kernel communication and synchronization. this OS makes it possible to realize a decentralized real-time application system by distributing p-kernels to multiple microprocessors.
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