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The Mach operating system was designed to incorporate the many recent innovations in operating system research to produce a technically advanced and fully functional system Mach incorporates multiprocessing support throughout which is extremely flexible and ranges from shared memory systems to systems with no memory shared between processors Mach is an operating system kernel developed at Carnegie-Mellon University to support operating system research primarily distributed and parallel computation The project at CMU ran from 1985 to 1994 Several factors were considered in making the Mach operating system It was important that the operating system be Multi-user and multitasking Network-compatible An excellent program-development environment Well-represented in the university research and business communities Extensible and robust Capable of providing room for growth and future extensions Mach minimizes kernel size by moving most kernel services into user-level processes The kernel itself contains only the services needed to implement a communication system between various user-level processes Mach splits the traditional UNIX notion of a process into two abstractions the task and the thread A task is the environment within which program execution occurs A thread is the basic unit of execution Its a lightweight process executing within a task and consists solely of the processor state such as program counter and hardware registers necessary for independent execution In Mach communication among operating system objects is achieved through messages Mach messaging is implemented by three kernel abstractions The Port The Port Set and The Message MACH uses priority policy for scheduling tasks and has an Exception Handling System that was designed according to the following 1 Single facility with consistent semantics for all exceptions 2 Clean and simple interface 3 Full support for debuggers and error handlers 4 No duplication of functionality within kernel 5 Support for user-defined exceptions Features of MACH 1Mach was designed to execute on a shared memory multiprocessor so that both kernel threads and user-mode threads could be executed
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