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Terminate a process #8

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zzz0072 opened this issue Sep 24, 2013 · 2 comments

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zzz0072 commented Sep 24, 2013

http://eng.upm.edu.my/~kmbs/teaching/OS/html/forkexit_8c.html
Check destroy part

ghost assigned zzz0072

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zzz0072 commented Oct 5, 2013

Study note:

tasks[number].stack stores a new task's .text entry at fork
How retenv did multitasking?
- A infinite loop as a scheduler
  - Pick a task from READY queue
  - Start to run the task in user space (check activate( (tasks[current_task].stack);)
    - active may also suspend previous task before start to run selected task. Need to check
    - Task invokes syscall
      - Check r7, do related service
    - Task did invokes syscall
      - Wait for hardware interrupt timer (check tick_count)
        
        Check if system needs to wake tasks who call 'sleep()' system call
  - Select next task

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zzz0072 commented Oct 6, 2013

c6f11a9#commitcomment-4260342

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