[ECOS] Re: Is main() a normal thread ?

[Claudio Leonel]

> Claudio Leonel wrote:
> 
>> Hi,
>>
>> Savin Zlobec wrote:
>>
>>> Claudio Leonel wrote:
>>>
>>>> Hi all,
>>>>
>>>> I thought main() was a normal thread but if I ran the
>>>> following application step by step in gdb there is no
>>>> return from the function cyg_thread_delay(). Apparently
>>>> it hangs in the call to cyg_thread_delay().
>>>>
>>>
>>> Check the CYGSEM_LIBC_STARTUP_MAIN_THREAD option -
>>> it controls how main() is invoked (from an eCos thread or not).
>>
>>
>>
>> It is enabled: main() will be invoked as an eCos thread
>> with 8192 bytes of stack and priority 10.
>> If I interrupt the application in gdb and execute 'info threads'
>> main() appears in the thread list.
>>
>> The most strange thing is that, I if precede 'cyg_thread_delay(100)'
>> with a diag_printf("..."), cyg_thread_delay() works and returns
>> after 100 ticks:
>>
>> ---------------------------------------------------------------
>> int main(void) {
>>   while (1) {
>>      diag_printf("...\n");    // Works if I insert this line !
>>      cyg_thread_delay(100);
>>   }   }
>> ---------------------------------------------------------------
> 
> 
> Most strange. Maybe you should give more info about your configuration,
> platform, eCos version and tools. Is the above all of your program or 
> are you
> doing something else before main (in cyg_user_start) ?

It is all my program !
My configuration is:
- arm-elf tools from the eCos 2.0 package (gcc 3.2.1)
- eCos configuration 2.0
- eCos from cvs
- AT91EB55 evaluation board from Atmel with redboot in Flash with
   AT91M55800A CPU (ARM7TDMI).
- Development host: Linux 2.4.20

Now I am not using main() anymore and using cyg_user_start() instead
and continuing the project, but is not confortable to know that
something is wrong and can manifest itself in other ways.

Regards,
Claudio L. Salvadori





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