What does idle thread do

[Yuxin Ren]

Thank you very much.
I have a further question.
The idle thread creates another two threads--sigma0_thread and boot_thread
(in Kernel_thread::init_workload in kernel_thread-std.cpp file ).
I am curious about what their priority is and when they finish.
In addition in my test, I only have a single thread doing memory map and
unmap.
But I find it is always preempted by another two threads. I do not know
what they are.
Could you give me some hints?

Thank you again.
Yuxin

On Thu, Sep 25, 2014 at 5:46 PM, Adam Lackorzynski <
adam at os.inf.tu-dresden.de> wrote:

> Hi,
>
> On Wed Sep 24, 2014 at 16:25:31 -0400, Yuxin Ren wrote:
> > I want to know what kernel idle thread does.
> > Does it just execute "halt" instruction or anything else?
>
> Mostly it is calling a halt instruction but it can also do remote work.
>
> > Where is code for the idle thread?
>
> Please look for 'for (;;) idle_op()' in kernel_thread.cpp and
> app_cpu_thread.cpp.
>
>
>
> Adam
> --
> Adam                 adam at os.inf.tu-dresden.de
>   Lackorzynski         http://os.inf.tu-dresden.de/~adam/
>
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