[ECOS] ecos-discuss@ecos.sourceware.org

[ECOS] ecos-discuss@ecos.sourceware.org

[Yong Chen Tan]

Hi, I got some doubts regarding the multi-threading.
I experience some problems when i do multi-threading.
The thread seems to stuck at the scanf function. Is it normal? Are there ways to solve this problem?
 
Is eCos multithreading - cooperative or preemptive?


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Re: [ECOS] ecos-discuss@ecos.sourceware.org

[Gary Thomas]

Yong Chen Tan wrote:
> 
> Hi, I got some doubts regarding the multi-threading.
> I experience some problems when i do multi-threading.
> The thread seems to stuck at the scanf function. Is it normal? Are there ways to solve this problem?

What's the source of your input?  Notice that the default console (haldiag) does
non-interrupt I/O (in fact with interrupts disabled) and will definitely block
all other threads from running.

If you want interruptable console I/O, you'll need to enable the serial drivers.
Check the archives for lengthy discussions on this point.

> Is eCos multithreading - cooperative or preemptive?

Preemptive.

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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
------------------------------------------------------------

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RE: [ECOS] ecos-discuss@ecos.sourceware.org

[Yong Chen Tan]

Hi, for my case is two threads running.
One thread is a menu printed on the hyperterminal and scanf is used to check for user input.
Another thread is to run a simple 7 Seg LED from 0-9 on  ARM Board.

So the thread for the 7 Seg LED is stuck at the scanf thread.
How should it be solved? Puzzled...


> Date: Wed, 25 Jun 2008 04:19:20 -0600
> From: gary@mlbassoc.com
> To: oricon776@hotmail.com
> CC: ecos-discuss@ecos.sourceware.org
> Subject: Re: [ECOS] ecos-discuss@ecos.sourceware.org
>
> Yong Chen Tan wrote:
>>
>> Hi, I got some doubts regarding the multi-threading.
>> I experience some problems when i do multi-threading.
>> The thread seems to stuck at the scanf function. Is it normal? Are there ways to solve this problem?
>
> What's the source of your input? Notice that the default console (haldiag) does
> non-interrupt I/O (in fact with interrupts disabled) and will definitely block
> all other threads from running.
>
> If you want interruptable console I/O, you'll need to enable the serial drivers.
> Check the archives for lengthy discussions on this point.
>
>> Is eCos multithreading - cooperative or preemptive?
>
> Preemptive.
>
> --
> ------------------------------------------------------------
> Gary Thomas | Consulting for the
> MLB Associates | Embedded world
> ------------------------------------------------------------
>
> --
> Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
> and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss
>

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Re: [ECOS] ecos-discuss@ecos.sourceware.org

[Andrew Lunn]

On Wed, Jun 25, 2008 at 12:19:00PM +0000, Yong Chen Tan wrote:
> 
> Hi, for my case is two threads running.
> One thread is a menu printed on the hyperterminal and scanf is used to check for user input.
> Another thread is to run a simple 7 Seg LED from 0-9 on  ARM Board.
> 
> So the thread for the 7 Seg LED is stuck at the scanf thread.
> How should it be solved? Puzzled...

Please don't top post.

> > Date: Wed, 25 Jun 2008 04:19:20 -0600
> > From: gary@mlbassoc.com
> > To: oricon776@hotmail.com
> > CC: ecos-discuss@ecos.sourceware.org
> > Subject: Re: [ECOS] ecos-discuss@ecos.sourceware.org
> >
> > Yong Chen Tan wrote:
> >>
> >> Hi, I got some doubts regarding the multi-threading.
> >> I experience some problems when i do multi-threading.
> >> The thread seems to stuck at the scanf function. Is it normal? Are there ways to solve this problem?
> >
> > What's the source of your input? Notice that the default console (haldiag) does
> > non-interrupt I/O (in fact with interrupts disabled) and will definitely block
> > all other threads from running.
> >
> > If you want interruptable console I/O, you'll need to enable the serial drivers.
> > Check the archives for lengthy discussions on this point.


Do as Gary said here.... Enable the interrupt driver serial device
driver and use /dev/ser0, or /dev/tty0 as appropriate.

    Andrew

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