Help: Creation of RTEMS Message Queue hangs up computer

[Joel Sherrill <joel@OARcorp.com>]

Alex wrote:
> I am using the rtems-4.6.0pre5.tar.bz2 version in a pc686 using mandrake 9.2...

PR 582 applies.  You should either update RTEMS or extract the 
appropriate patches with CVS.  It would be better to update RTEMS since 
you will pick up a few more bug fixes.

--joel

> Alex
> 
> 
> 
> ----- Mensagem Original -----
> De: Joel Sherrill joelOARcorpcom <joel.sherrill at OARcorp.com>
> Data: Terça-Feira, 21 de Dezembro de 2004, 21:51
> Assunto: Re: Help: Creation of RTEMS Message Queue hangs up computer
> 
> 
>>
>>Alex wrote:
>>
>>>Hi,
>>>I am trying to use posix message queues in RTEMS. I have a 
>>
>>little program that only creates a message queue, nothing else. 
>>But when the mq_open() posix function is executed all the system 
>>blocks forever. I already “debug” the kernel and what I saw was 
>>the _RTEMS_Lock_allocator() function, in regiongetsegment.c file, 
>>which blocks forever but I can't see why...
>>
>>This sounds like a known bug.  What version of RTEMS are you running?
>>
>>--joel
>>
>>
>>
>>>ENV: pc686, mandrake linux 9.2, rtems 4.6, i686 bsp
>>>
>>>Could you help me please?
>>>Any advices?
>>>
>>>By the way, why do we need regions in rtems? Which is the main 
>>
>>aim of regions? In rtems the memeory is completly flat isn't it? 
>>So, why regions?
>>
>>>Many thanks,
>>>
>>>Alex
>>>(RTEMS Beginner)
>>>
>>>
>>>This is my little rtems posix program:
>>>
>>>#define CONFIGURE_INIT
>>>#include <rtems.h>
>>>#include <bsp.h>
>>>#include <stdio.h>
>>>#include <stdlib.h>
>>>#include <string.h>
>>>#include <pthread.h> 
>>>#include <limits.h>
>>>#include <unistd.h>  
>>>#include <errno.h>
>>>#include <sched.h> 
>>>#include <sched.h>
>>>#include <fcntl.h>
>>>#include <time.h>  
>>>#include <signal.h>
>>>#include <mqueue.h>
>>>#include <rtems/posix/mqueue.h>
>>>#include <rtems/posix/time.h>
>>>#define CONFIGURE_INIT_TASK_ENTRY_POINT   POSIX_Init
>>>
>>>void *POSIX_Init(void *argument)
>>>{
>>>mqd_t               mq;
>>>
>>>puts( "\n\n-- POSIX MESSAGE QUEUE --" );
>>>//CREATING / OPENING MESSAGE QUEUE
>>>mq = mq_open("Q_Write", O_CREAT | O_RDWR, 0x777,NULL);
>>>if(mq==-1)
>>>{
>>>         printf("\nError opening message queue Q_Write...");
>>>         exit(0);
>>>}
>>>else
>>>{
>>>         printf("\nQueue Q_Write successfully opened...");
>>>}
>>>
>>>   puts( "-- END OF POSIX MESSAGE QUEUE PROGRAM --");
>>>   exit(0);
>>>}
>>>
>>>#define CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER
>>>#define CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER
>>>#define CONFIGURE_POSIX_INIT_THREAD_TABLE
>>>#define CONFIGURE_MAXIMUM_POSIX_THREADS               2
>>>#define CONFIGURE_MAXIMUM_POSIX_MESSAGE_QUEUES  10
>>>#define CONFIGURE_MAXIMUM_POSIX_TIMERS                   4
>>>#define CONFIGURE_MAXIMUM_POSIX_MUTEXES              20
>>>#define CONFIGURE_MAXIMUM_REGIONS                    4
>>>#define CONFIGURE_POSIX_INIT_THREAD_TABLE
>>>#define CONFIGURE_POSIX_INIT_THREAD_STACK_SIZE  
>>
>>(RTEMS_MINIMUM_STACK_SIZE * 4)
>>
>>>#define CONFIGURE_EXTRA_TASK_STACKS  (5 * RTEMS_MINIMUM_STACK_SIZE)
>>>#include <confdefs.h>
>>> 
>>>
>>>
>>>
>>
>>________________________________________________________________________________> Finalmente uma Caixa de Correio com todos os Extras: 21 MB + Anti-vírus + Filtro de
>>
>>>mensagens indesejadas + Attachs 7MB + Bloqueador IOL + Conteúdos 
>>
>>IOL + Ícones dinâmicos…
>>
>>>Crie aqui a sua: http://www.iol.pt/correio/rodape.php?dst=0411151
>>>
>>
>>
>>-- 
>>Joel Sherrill, Ph.D.             Director of Research & Development
>>joel at OARcorp.com                 On-Line Applications Research
>>Ask me about RTEMS: a free RTOS  Huntsville AL 35805
>>   Support Available             (256) 722-9985
>>
>>
> 
> 
> ________________________________________________________________________________
> Finalmente uma Caixa de Correio com todos os Extras: 21 MB + Anti-vírus + Filtro de
> mensagens indesejadas + Attachs 7MB + Bloqueador IOL + Conteúdos IOL + Ícones dinâmicos…
> Crie aqui a sua: http://www.iol.pt/correio/rodape.php?dst=0411151
> 


-- 
Joel Sherrill, Ph.D.             Director of Research & Development
joel at OARcorp.com                 On-Line Applications Research
Ask me about RTEMS: a free RTOS  Huntsville AL 35805
    Support Available             (256) 722-9985