Re: [Xenomai-help] Real-time printf in Xenomai 2.6.0

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

On 02/24/2012 12:07 AM, Jeff Webb wrote:
> On 02/23/2012 04:26 PM, Gilles Chanteperdrix wrote:
>> On 02/23/2012 11:02 PM, Jeff Webb wrote:
>>> I was happy to see that printf now works from real-time POSIX
>>> threads in Xenomai 2.6.0.  Unfortunately, I'm seeing some strange
>>> behavior that surfaces when I try to print the string "\n" by
>>> itself.  When I run the attached example program, I get:
>>> 
>>> $ ./printf_test start CPU time limit exceeded $
>>> 
>>> IfI replace the two printf calls with rt_printf calls and
>>> #include<rtdk.h>,I get the expected result:
>>> 
>>> $ ./rt_printf_test start 1 2 3 4 ^C $
>>> 
>>> The original example also works if these two lines:
>>> 
>>> printf("%d", count); printf("\n");
>>> 
>>> are replaced with:
>>> 
>>> printf("%d\n", count);
>>> 
>>> Can someone confirm if this a bug in Xenomai 2.6.0, something
>>> specific to my HW/SW installation, or some mistake in my test
>>> program?
>> 
>> I would bet the call to printf is replaced with something else
>> (such as putchar). Could you disassemble the test to check this?
> 
> Yes, it appears that putchar is called indeed.
> 
>> Note that I have fixed similar issues in xenomai-2.6 current
>> repository, so you could give it a try.
> 
> I may give that a try.  Now that I have confirmed that putchar is the
> issue, do you think xenomai-2.6 current will fix the problem?  Is
> putchar now wrapped as well?  I noticed that puts appears to be
> wrapped from the disassembly output.

No, it is not yet wrapped.

-- 
                                                                Gilles.