linux context switching

From: 발딱세우기 (sslim_at_core.kaist.ac.kr)
Date: 02/09/04

  • Next message: Tauno Voipio: "Re: Getting hostname from /proc/dev/tcp" 
    Date: Mon, 9 Feb 2004 14:14:23 +0900

    In linux, is there kernel context?
    Assume following sistuation,
    1. a user process is having CPU
    2. the process calls systems calls such as ioctl()
    3. the process is excuted in a kernel mode, at this momnet is there context
    switching?
    4. H/W interrupt occurs
    5. save contexts of the process in a kernel mode
    6. interrupt handler is excuted
    7. the handler gets finished
    8. RET is called
    9. at this moment, without preemption, the interrupted process in a kernel
    mode will be selected again.
    If the steps I mentioned above is right, I think there is no pure kernel
    context to be saved.
    All contexts have corresponding user processes. Am I right?
    Who owns Task number 0? kernel?

    I have analyzed source codes. But it's very hard to understand them and
    figure out my questions.

    Your sincere advices will be appreciated :-)

  • Next message: Tauno Voipio: "Re: Getting hostname from /proc/dev/tcp"

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