03_unix - The UNIX time-sharing system Unit 3 OS structure...

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The UNIX time°sharing system Unit 3
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OS structure ● Three primary designs ○ Monolithic ○ Layered ○ Microkernel
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Monolithic user applications OS: procs+data hardware user/kernel boundary
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Layer ±XINU² user filesystem inter-machine net. device mgr + drivers real-time clock mgr IPC process coord process mgr memory mgr hardware user/kernel boundary
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Microkernel hardware kernel FS me m svr pro c svr use r app use r app use r app user/kernel boundary?
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**Discussion Microkernel Layered Monolithic Disadvantages Advantages
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++End°to°end argument ● where to provide functionality “The function in question can completely and correctly be implemented only with the knowledge and help of the application standing at the end points of the communication system. Therefore, providing that questioned function as a feature of the communication system itself is not possible.” http://www.reed.com/Papers/EndtoEnd.html
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))Consider **Dijkstra ³$9!#8 ● Can any system be made hierarchical?
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