On Wed, May 10, 2000 at 07:59:16AM +0200, Tobias Klotz wrote:
> Is it not recommend to use pthread_wakeup_np form inside an ISR?`(I
> currently do
> it and I'm not sure if it is a good idea, what makes the difference?).
pthread_wakeup_np and pthread_suspend_np both call the scheduler
(if the target thread is on the same machine) so the ISR may
not complete right away -- which is sometimes exactly what you want.
Here's an example:
Re_entrant_ISR:
do low level stuff
make sure to re-enable hard interrupts from this source
/* which thread did we interrupt? Is it the target?*/
if(pthread_self() == my_thread){
/* give up the processor at once */
pthread_suspend_np(pthread_self())
return; /*after thread wakes up again */
}
else {
/* just make sure thread does not get scheduled again*/
pthread_kill(my_thread,RTL_SIG_SUSPEND);
return; /* scheduler is not called yet */
}
>
> Which header do I have to include to use pthread_kill ?
>
Just use 2.2 or later.
> Thanks
>
> tobias
>
> [EMAIL PROTECTED] schrieb:
>
> > 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
> > > >-- [rtl] ---
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