Re: [Xenomai-help] rt_task_bind() and timeout values

[Philippe Gerum <rpm@xenomai.org>]

Stefan Kisdaroczi wrote:
> Hi Philippe,
> 
> Philippe Gerum schrieb:
>> Stefan Kisdaroczi wrote:
>>> Hi all,
>>>
>>> If I call rt_task_bind() with a timeout value other than TM_NONBLOCK or
>>> TM_INFINITE
>>> it works not as expected (by me).
>>>
>>> System: Debian Lenny with Xenomai 2.4.3 and Kernel 2.6.24.
>>>
>>> The attached example calls 3 times rt_task_bind() for a nonexistent
>>> task:
>>>
>>> 1. dont wait: rt_task_bind(&task,"SomeTaskName",TM_NONBLOCK)
>>>   -> returns -11 (EWOULDBLOCK) -> OK
>>>
>>> 2. wait 5 secs: rt_task_bind(&task,"SomeTaskName",5000000000LL);
>>>   -> returns immediately -13 (EACCES) without waiting -> ?
>>>   -> I expected ETIMEDOUT after 5 seconds
>>>
>>
>> "SomeTaskName" was found in the registry, but suddenly disappeared
>> while in the
>> process of returning its handle (we do post-validation after binding).
>> That task
>> has probably exited prematurely.
> 
> There was and is no task with this name. This happens on a freshly
> rebooted box
> with any name i choose. Can someone please try my small example from the
> first
> mail on his box. Thank you.
>

Can't test right now, unfortunately, and I'll be travelling tomorrow.

I suspect some weird issue with xnregistry_bind(). Please make sure to disable
CONFIG_XENO_OPT_NATIVE_REGISTRY, and apply this trivial trace point. The only
reason to get EACCES would be to receive a success code from xnregistry_bind(),
which we should not. I'd be interested to know the result codes for each call
your snippet does. TIA,

--- ksrc/nucleus/registry.c	(revision 4044)
+++ ksrc/nucleus/registry.c	(working copy)
@@ -776,6 +776,8 @@

 	xnlock_put_irqrestore(&nklock, s);

+	printk(KERN_INFO "%s: ret=%d\n", __FUNCTION__, err);
+
 	return err;
 }


>>> 3. wait forever: rt_task_bind(&task,"SomeTaskName",TM_INFINITE);
>>>   -> blocks a expected -> OK
>>>
>>> I have the same problem with rt_queue_bind() calls.
>>>
>>> Do i expect something wrong?
>>>
>>> Thanks for your help!
>>>
>>> kisda
>>>
>>>
>>> ------------------------------------------------------------------------
>>>
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>>> Xenomai-help mailing list
>>> Xenomai-help@domain.hid
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>>
>>
> 
> 


-- 
Philippe.