how to disable interrupt in application?

how to disable interrupt in application?

[zhuzhenhua]

our project have a video decoder code run as application. there is
some short code want to be run uninterruptable. is there anyway to do
it?
thanks for any hints
Best Regards


zhuzhenhua

Re: how to disable interrupt in application?

[Bin Chen]

man sigprocmask

On 5/31/06, zhuzhenhua <zzh.hust@gmail.com> wrote:
> our project have a video decoder code run as application. there is
> some short code want to be run uninterruptable. is there anyway to do
> it?
> thanks for any hints
> Best Regards
>
>
> zhuzhenhua
>
>

Re: how to disable interrupt in application?

[Kevin D. Kissell]

sigprocmask manages signals, which are user-mode abstractions
of exceptions.  It does not affect hardware interrupt behavior.
If by "uninterruptable", ZhuZhenHua means that the decoder
process will not get switched out in favor of another user-mode
process, then getpriority()/setpriority() provide some control
that may be sufficient.  If what is desired is that hardware interrupts
are actually masked during some critical sequence, the critical
sequence must be executed with kenel privilege - you need to
look at putting the critical sequence into a driver or other loadable
kernel module that can be invoked by the application code.

            Regards,

            Kevin K.

----- Original Message ----- 
From: "Bin Chen" <binary.chen@gmail.com>
To: "zhuzhenhua" <zzh.hust@gmail.com>
Cc: "linux-mips" <linux-mips@linux-mips.org>
Sent: Wednesday, May 31, 2006 8:11 AM
Subject: Re: how to disable interrupt in application?


> man sigprocmask
> 
> On 5/31/06, zhuzhenhua <zzh.hust@gmail.com> wrote:
> > our project have a video decoder code run as application. there is
> > some short code want to be run uninterruptable. is there anyway to do
> > it?
> > thanks for any hints
> > Best Regards
> >
> >
> > zhuzhenhua
> >
> >
> 
> 

Re: how to disable interrupt in application?

[zhuzhenhua]

On 5/31/06, Kevin D. Kissell <KevinK@mips.com> wrote:
> sigprocmask manages signals, which are user-mode abstractions
> of exceptions.  It does not affect hardware interrupt behavior.
> If by "uninterruptable", ZhuZhenHua means that the decoder
> process will not get switched out in favor of another user-mode
> process, then getpriority()/setpriority() provide some control
> that may be sufficient.  If what is desired is that hardware interrupts
> are actually masked during some critical sequence, the critical
> sequence must be executed with kenel privilege - you need to
> look at putting the critical sequence into a driver or other loadable
> kernel module that can be invoked by the application code.
>
>             Regards,
>
>             Kevin K.
>
> ----- Original Message -----
> From: "Bin Chen" <binary.chen@gmail.com>
> To: "zhuzhenhua" <zzh.hust@gmail.com>
> Cc: "linux-mips" <linux-mips@linux-mips.org>
> Sent: Wednesday, May 31, 2006 8:11 AM
> Subject: Re: how to disable interrupt in application?
>
>
> > man sigprocmask
> >
> > On 5/31/06, zhuzhenhua <zzh.hust@gmail.com> wrote:
> > > our project have a video decoder code run as application. there is
> > > some short code want to be run uninterruptable. is there anyway to do
> > > it?
> > > thanks for any hints
> > > Best Regards
> > >
> > >
> > > zhuzhenhua
> > >
> > >
> >
> >
>

actually i don't want the pipelining be interrupted while run our user
define instructions.

Re: how to disable interrupt in application?

[Kevin D. Kissell]

> actually i don't want the pipelining be interrupted while run our user
> defined instructions.

If you want to guarantee that, you need to put that code into a kernel
module that turns off interrupts during processing - and you need to
accept responsibility for the fact that a problem in your code may be
irrecoverably fatal to the system, and that errors in system timing may
accumulate due to clock interrupts not being serviced.

            Regards,

            Kevin K.

Re: how to disable interrupt in application?

[Freddy Spierenburg]

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Hi,

On Wed, May 31, 2006 at 02:11:00PM +0800, Bin Chen wrote:
> On 5/31/06, zhuzhenhua <zzh.hust@gmail.com> wrote:
> >our project have a video decoder code run as application. there is
> >some short code want to be run uninterruptable. is there anyway to do
> >it?
> man sigprocmask
This way you can mask signals, but AFAIK your process is still
interruptable. What if the kernel scheduler decides another
process deserves some running time? Not something you can
suppress, if I'm correct.

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