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

[Jeff Webb <jeff.webb@domain.hid>]

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.

Thanks again for all the help,

Jeff