From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Niklaus Giger" <Niklaus.Giger@domain.hid>
Date: Fri, 15 Sep 2006 21:44:48 +0200
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Subject: [Xenomai-core] Odd behaviour of vxworks
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To: xenomai@xenomai.org
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Hi

First I was surprised that a lot of vxworks return -1 unless
running inside a thread created by taskSpawn, e.g. taskIdSelf
or taskMCreate return -1.

Then I did added a very simple sequence of
semMCreate
semTake
semGive
and now semGive returned me -1 (ERROR). This puzzled me even more, as
this is the same sequence where the simulator has no problem
and where semGive returns 0 (OK).

I modified satch.c (see patch below) to get a simple test case (in UVM).
Native and UVM are built-in.
Output is:

_user_init: semMCreate 4 taskId -1
__xeno_user_init: semTake 4 status -1 -1 taskId -1
__xeno_user_init: semGive 4 status -1 -1 taskId -1
consumer_task: task 6 ConsumerTask
producer_task: task SEM_DELETE_SAFE 7 ProducerTask

producer_task: semMCreate 8 taskId 7
producer_task: semTake 8 status 0 0 taskId 7
producer_task: semGive 8 status -1 1441896 taskId 7
producer_task: semDelete 8 status 0 1441896 taskId 7
producer_task: task 7 ProducerTask

producer_task: semMCreate 9 taskId 7
producer_task: semTake 9 status 0 1441896 taskId 7
producer_task: semGive 9 status -1 1441896 taskId 7
Now playing Surfing With The Alien...
Now playing Lords of Karma...
Now playing Banana Mango...

I am reproduced these results with Xenomai trunk revision 1618.

Using a simulator (built with an earlier version) outputs like this:
Xenomai/sim: real-time nucleus v2.2-rc1 (Engines Of Creation) loaded.
starting VxWorks services.

__xeno_user_init: semMCreate 269073416 taskId 268720448
__xeno_user_init: semTake 269073416 status 0 0 taskId 268720448
__xeno_user_init: semGive 269073416 status 0 0 taskId 268720448
consumer_task: task 269074952 ConsumerTask
producer_task: task SEM_DELETE_SAFE 269075976 ProducerTask

producer_task: semMCreate 269073544 taskId 269075976
producer_task: semTake 269073544 status 0 0 taskId 269075976
producer_task: semGive 269073544 status 0 0 taskId 269075976
producer_task: semDelete 269073544 status 0 0 taskId 269075976
producer_task: task 269075976 ProducerTask

producer_task: semMCreate 269073544 taskId 269075976
producer_task: semTake 269073544 status 0 0 taskId 269075976
producer_task: semGive 269073544 status 0 0 taskId 269075976

Any hint would be appreciated.

Best regards

Niklaus Giger

begin 666 satch.patch
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end