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Date: Fri, 13 Apr 2007 22:17:36 +0200
From: Jean-Luc Pamart <jlpamart@domain.hid>
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Subject: [Xenomai-help] Execution error with rtdm heartbeat example
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Hello

I  try to execute the heartbeat example (xenomai 2.3 with kernel 2.6.19)
With the unmodified sources when the heartbeat module
is being unloaded (rmmod)  I obtain :

atkbd.c: Spurious ACK on isa0060/serio0. Some program might be trying 
access hardware directly.  

and the unloading can't be finished.

I try to slightly change the sources. It works with no bad kernel 
message and
complete unloaded with this modification :

void heartbeat(void *cookie)
{
       
        while (!end) {
              ...
        }
    set_leds(0);
    
}
void cleanup_module(void)
{
    //  set_leds(0);
}  

My interpretation :
In the non modified example, We try to access directly to the keyboard
after the end of the rt-driver(after  
rtdm_task_join_nrt(&heartbeat_task, 100);)
So it is a problem for the kernel.

Is it a good interpretation ?
 
what is the difference between rtdm_task_join_nrt(&heartbeat_task, 100) and
 rtdm_task_destroy(&heartbeat_task) ?
What is the role of the polling argument (value 100) ?


best regards