HI All,
Since there is no semaphore objects in SEK , i need to create
it for my task. Since semaphore objects are automic in nature , is
there any method to create an atomic variable? Some S's have some
objects called atomic_t but in SEK there is nothing like this. Can
anybody give me some pointers to create an atomic variables and create
semaphore operations?
regards
Anks

Mr_Nayak wrote:
HI All,
Since there is no semaphore objects in SEK , i need to create
it for my task. Since semaphore objects are automic in nature , is
there any method to create an atomic variable? Some S's have some
objects called atomic_t but in SEK there is nothing like this. Can
anybody give me some pointers to create an atomic variables and create
semaphore operations?

regards
Anks

If your process does not have a Test And Set opcode, look up Dekker's
Algorithm or Peterson's algorithm. Then implementing the P(s) and V(s)
semaphore operations are easy. Any decent Systems text book
should have it. I have an ancient one called
An Introduction to Systems
Harvey M. Deitel
(it is so old, ity doesn't have Peterson's Algorithm.)

What is SEK anyway?

Good luck,
Ed

Mr_Nayak wrote:
HI All,
Since there is no semaphore objects in SEK , i need to create
it for my task. Since semaphore objects are automic in nature , is
there any method to create an atomic variable? Some S's have some
objects called atomic_t but in SEK there is nothing like this. Can
anybody give me some pointers to create an atomic variables and create
semaphore operations?

regards
Anks

If your CPU does not have a Test And Set opcode, look up Dekker's
Algorithm or Peterson's algorithm. Then implementing the P(s) and V(s)
semaphore operations are easy. Any decent Systems text book
should have it. I have an ancient one called
An Introduction to Systems
Harvey M. Deitel
(it is so old, ity doesn't have Peterson's Algorithm.)

What is SEK anyway?

Good luck,
Ed

Wed, 13 Sep 2006 02:58:07 -0700, Mr_Nayak wrote:

Since there is no semaphore objects in SEK , i need to create
it for my task. Since semaphore objects are automic in nature , is
there any method to create an atomic variable? Some S's have some
objects called atomic_t but in SEK there is nothing like this. Can
anybody give me some pointers to create an atomic variables and create
semaphore operations?

SEK/VDX is an industry standard specification. Look in the 2.2.3 spec
under resource management, Sections 8 and 13.4 (DeclareResource(),
GetResource(), and ReleaseResource() ).

Are you writing your own RTS to the spec? Might be easier to buy a
compliant one such as ThreadX. If you don't know how to perform "atomic"
operations, you're either (1) a student asking for homework help, or (2)
in over your head. If (2), hire some knowledgeable help.

~Dave~

Hi All,
Thanks for the reply.
Dave i am aware of the Resource concept in SEK . I am writing some
adapters where i have to have some semaphores according to some
standard. Its not that i am not aware of atomic operations (Which
almost all S books will give) i am not aware how to create or declare
these variables. I think my question is not clear here. If somebody
asks some questions that doesnot mean they are students or they dont
have any knowledge or its either their experience level is less or
they are new to certain areas. I bet you too dont know EVERYTHING which
you can ask yourself.
Thanks for the reply

Anks

Dave wrote:
Wed, 13 Sep 2006 02:58:07 -0700, Mr_Nayak wrote:

Since there is no semaphore objects in SEK , i need to create
it for my task. Since semaphore objects are automic in nature , is
there any method to create an atomic variable? Some S's have some
objects called atomic_t but in SEK there is nothing like this. Can
anybody give me some pointers to create an atomic variables and create
semaphore operations?

SEK/VDX is an industry standard specification. Look in the 2.2.3 spec
under resource management, Sections 8 and 13.4 (DeclareResource(),
GetResource(), and ReleaseResource() ).

Are you writing your own RTS to the spec? Might be easier to buy a
compliant one such as ThreadX. If you don't know how to perform "atomic"
operations, you're either (1) a student asking for homework help, or (2)
in over your head. If (2), hire some knowledgeable help.
--
~Dave~

13 Sep 2006 20:16:48 -0700, "Ed Prochak" <edprochak@gmail.com>
wrote:
>What is SEK anyway?

SEK is the acronym for ' Systeme und deren Schnittstellen
die Elektronik im Kraftfahrzeug' which translates to ' Systems and
the Corresponding Interfaces for Automotive Electronics' in English.

It is an organization that has produced specifications for an embedded
S (and a lot of related things) primarily intended for the automotive
industry. The S specification is also referred to as SEK.

More details at http://www.osek-vdx.org/

Have a nice day,
Pradeep

14 Sep 2006 23:45:44 -0700, "Mr_Nayak" <anoop.nayak@gmail.com>
wrote:
>Dave wrote:
>Wed, 13 Sep 2006 02:58:07 -0700, Mr_Nayak wrote:
>>
>Since there is no semaphore objects in SEK , i need to create
>it for my task.
>>
>SEK/VDX is an industry standard specification. Look in the 2.2.3 spec
>under resource management, Sections 8 and 13.4 (DeclareResource(),
>GetResource(), and ReleaseResource() ).
>>
>Dave i am aware of the Resource concept in SEK . I am writing some
>adapters where i have to have some semaphores according to some
>standard.

Fixed top posting. Please see

Since you are aware of the Resource concept in SEK, I believe you
would be able to use Resources to control access to, well, resources.

Since you need to implement semaphores according to 'some standard', I
suggest that you check if the requirements of 'some standard' are
compatible with the facilities of SEK.

Section 1.1 of SEK specification 2.2.3 makes it very clear that SEK
intentionally left out support of dynamic generation of system
objects. S specifications like PSIX allow dynamic generation
of system objects. If you want something like that in your adapters,
it would be best to look for an S *not* based on SEK. You could add
such features to an SEK implementation. However, doing so would very
likely be a lot more difficult, error prone and expensive than using
an S that directly supports those features.

Have a nice day,
Pradeep
All opinions are mine and do not represent the views or
policies of my employer.
R Pradeep Chandran rpc AT pobox DT com

Pradeep Chandran wrote:

14 Sep 2006 23:45:44 -0700, "Mr_Nayak" <anoop.nayak@gmail.com>
wrote:
>Dave wrote:
>Wed, 13 Sep 2006 02:58:07 -0700, Mr_Nayak wrote:
>>
>Since there is no semaphore objects in SEK , i need to create
>it for my task.
>>
>SEK/VDX is an industry standard specification. Look in the 2.2.3 spec
>under resource management, Sections 8 and 13.4 (DeclareResource(),
>GetResource(), and ReleaseResource() ).
>>
>Dave i am aware of the Resource concept in SEK . I am writing some
>adapters where i have to have some semaphores according to some
>standard.
>
Fixed top posting. Please see

Since you are aware of the Resource concept in SEK, I believe you
would be able to use Resources to control access to, well, resources.

Since you need to implement semaphores according to 'some standard', I
suggest that you check if the requirements of 'some standard' are
compatible with the facilities of SEK.

Section 1.1 of SEK specification 2.2.3 makes it very clear that SEK
intentionally left out support of dynamic generation of system
objects. S specifications like PSIX allow dynamic generation
of system objects. If you want something like that in your adapters,
it would be best to look for an S *not* based on SEK. You could add
such features to an SEK implementation. However, doing so would very
likely be a lot more difficult, error prone and expensive than using
an S that directly supports those features.

Have a nice day,
Pradeep
All opinions are mine and do not represent the views or
policies of my employer.
R Pradeep Chandran rpc AT pobox DT com

HI Pradeep,
Thanks for the reply. As you said SEK doesnt support dynamic creation
of objects i am facing the problem. You might be knowing that it wont
support malloc and everything should be static. What i need to do is
write some wraper above the SEK which will make sure that my
application which is independent of S should work. So i dont have a
chance of opting other S. Anyways thanks for the reply.

Anoop