UNIX as an Application Program
1990
1. Abstract Since March of 1989 we have had running at CMU a computing environment in which the functions of a traditional Unix system are cleanly divided into two parts: facilities which manage the hardware resources of a computer system (such as CPU, I/O and memory) and support for higher-level resource abstractions used in the building of application programs, e.g. files and sockets. This paper describes the implementation of Unix as a multithreaded application program running on the Mach kernel. The rationale, design, implementation history and performance of the system is presented.
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