Summary
Summary Introduction to the OSC module
- Institution
- The University Of Nottingham (UON)
introduction to the OSC module, the scope and various assessment information etc
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OSC : Operating Systems and ConcurrencyOperating Systems
- Middleman between hardware and user
- “Layer of Indirection” atop hardware
- Uses multi-programming (modern day)
- Goal1 : Improve User Experience
- Goal2 : Maximize resource Utilization
- Overview of functions
- Abstraction for applications: Hides certain things user doesn’t need to see
- Cleaner interface for hardware: GUI
- Allocates/Shares resources in a Fair/Safe way
OS Structure
- User Space
- UI,Application etc
- Kernel Space
- MMU, CPU etc
- Modern OS: Hybrid Systems (Monolithic X Micro)
Micro Kernel Monolithic Kernel
Kernel mode and User mode separate Build all apps in kernel mode
Advantages: Advantages: No need for system calls
Cause less damage if things go wrong
Different levels of privileges (restrictions)
Much more reliable
Disadvantages: Disadvantages:
Need to make system calls for OS services Difficult to maintain
Overhead of system calls slows things down Easier to bring whole system down
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