Help: Creation of Message Queue hangs up the system

[Alex]

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...

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>




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