On Tue, May 09, 2000 at 10:12:43AM -0500, daniel sheltraw wrote:
> I have setup an ISR that accepts hardware interrupts from another
> device via the parallel port. The ISR simply increments a counter. I would
> like to produce a pause in the task when the counter reaches a certain value
> and restart the task at another counter value. This
> should be done without a busy wait checking the value of the counter.
Here's on way.
/* note that if "thread" is running when the SUSPEND is sent, it
will continue to run until it times out or calls the scheduler */
interrupt_handler:
count++;
if(should_stop(count))
pthread_kill(thread,RTL_SIG_SUSPEND);
else if(should_restart(count))
pthread_kill(thread,RTL_SIG_WAKEUP);
>
> Any clarifications on using suspend/resume routines to control the task
> within an ISR. Any other suggestions? Semaphores were
> suggested. Does anyone have a code snippet for a semaphore approach?
>
> Thanks everyone,
> Daniel
>
>
> >From: [EMAIL PROTECTED]
> >To: [EMAIL PROTECTED]
> >CC: [EMAIL PROTECTED]
> >Subject: Re: [rtl] RT interrupt service routine question
> >Date: Tue, 09 May 2000 16:31:47 +0200 (MET DST)
> >
> >
> > > > pthread_wakeup_np() is safe. The others are unknown (yet).
> > >
> > > pthread_suspend_np is safe, but may suspend the interrupt handler.
> >
> >Folks,
> >
> >"Safe" just means: it won't crash your machine (immediately).
> >It not equal to "useful" or "wise". ;-)
> >
> >
> >Gabor
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