On 14 Mar 2005 13:06:37 -0000, jhoney jhoney
<jhoney_joney@xxxxxxxxxxxxxx> wrote:
> I have one doubt. How the process is blocking on a system call. For
AFAIK, sleeping is mor or less done in the following way:
1. The process adds itself to a work queue (wake_queue_head_t) that
will wake it up later on.
2. process calls set_current_state(TASK_INTERRUPTIBLE)
(or TASK_UNINTERRUPTIBLE if signals are not allowed to wake it up)
3. calls schedule()
- this is where sleeping occurs
4. set_current_state(TASK_RUNNING)
- this gets executed once the process is waken up and scheduled.
And that's it. BTW, this is IMHO a very basic question. Consider
buying a book on kernel programing. I'm currenty reading Linux Kernel
Development (2nd edition) by Robert Love and so far it seems to be
up-to date (covers kernels 2.6.x), well written and indeed very good.
HTH
Martin
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