On Thu, May 04, 2000 at 08:38:32PM +0530, santhosh m kumar wrote:
> Hi
>
> What will happen if i have a code like this,
>
> Thread 1
> ---
> rtl_no_interrupts
> rtl_schedule
> rtl_restore_interrupts
> ---
>
> Thread 2
> ---
> rtl_schedule
> ---
>
> Will the correct interrupt status be restored.
>
Yes.
thread 2 running with interrupts enabled
call rtl_schedule
switch to thread 1
thread 1 disables interrupts
calls rtl_schedule
switch to thread 2
thread 2 is running with interrupts enabled!
> Thanks and Regards
> Santhosh
> -----Original Message-----
> From: [EMAIL PROTECTED] [SMTP:[EMAIL PROTECTED]]
> Sent: Thursday, May 04, 2000 8:26 PM
> To: santhosh m kumar
> Cc: '[EMAIL PROTECTED]'
> Subject: Re: [rtl] rtl_no_interrupts question
>
> On Thu, May 04, 2000 at 12:59:33PM +0530, santhosh m kumar wrote:
> > Hi,
> >
> > In pthread_make_periodic_np and few other function in rtl_sched.c,
> > rtl_no_interrupts is called and then rtl_schedule is called. After which
> > rtl_restore_interrupts is done.
> > Will this not cause some problems, that is the interrupts will be disable
> > when the new task is running. If i am wrong, can any one tell me where
> > exactly is the rtl_restore_interrupts done.
>
> The scheduler does
> save the interrupt status
> disable interrupts
> switch to new thread
> restore interrupt status saves for this thread.
>
> So the new thread will run with the correct interrupt status.
>
>
> >
> > One more question, is priority inversion supported in RTL.
>
> Priority inversion is a design issue. RTLinux is designed so that the
> RT threads never wait for Linux unless they request to do so. You should
> design your RT application so that lower priority threads do not
> hold resources needed by higher priority threads, except when they have
> disabled scheduling. It's not very hard unless the application is too
> complex -- and then nothing will help anyways except for a redesign.
>
>
> >
> > Thanks and Regards
> > Santhosh
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> --
> ---------------------------------------------------------
> Victor Yodaiken
> FSMLabs: www.fsmlabs.com www.rtlinux.com
> FSMLabs is a servicemark and a service of
> VJY Associates L.L.C, New Mexico.
>
--
---------------------------------------------------------
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FSMLabs: www.fsmlabs.com www.rtlinux.com
FSMLabs is a servicemark and a service of
VJY Associates L.L.C, New Mexico.
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