Hi Guys,
I am not sure whether this API is avialable to user space but this
code snippet is part of Kernel module.
> > Test code:
> > --------------
> > read()
> > {
> > if(down_interruptible())
> > return error;
> > mdelay(10000);
> > up();
> > }
> >
> > With this code in place, I try to do a 'CTRL+C' when it hangs at that delay.
> > It does not respond to my 'CTRL + C'.
>
> Is that user space or kernel space code?
This is my my read implementation of char driver routine i.e. a scull_read.
With the above code in place, when it hangs in the kernel at mdelay(),
a 'CTRL+C' does not preempt the kernel process and give back the
control to terminal prompt.
The kernel only gives control back after the delay is complete.
I was thinking CTRL+C should generate a preemption signal to kernel.
If not, I would like to know what are those signals that can trigger a
preemption in kernel mode.
Does it take more that just enabling 'CONFIG_PREEMPT' to enable a
preemptive kernel.
Regards,
Bhanu J
>
> regards,
>
> Mulyadi
>
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