【2014-11-23】《The Hardware/Software Interface》– Section 8 (continue)

• Exceptions:
  • An exception is transfer of control to the operating system in response to some event.
  • exception processing by exception handler
  • 

1. Process(进程)

• Process abstraction provides an interface between the program and the underlying CPU + Memory.
• Definition: A process is an instance of a running program
• Process provides each program with two key abstractions:
  • Logical control flow
    • Each process seems to have exclusive use of the CPU
  • Private virtual address space
    • Each process seems to have exclusive use of main memory

Context Switching

• Processes are managed by a shared chunk of OS code called the kernel
• Control flow passes from one process to another via a context switch
• 

Creating New Processes & Programs

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