RE: [ECOS] FW: [ECOS] Mailboxes - priorities of messages

["Han Hoekstra" <Han dot Hoekstra at WirelessValue dot nl>]

Hey,

I have had the same problem in one of my projects and what I did is trigger
the receive process using a semaphore and have it check multiple mailboxes,
the one with the highest priority first and the one with the lowest priority
last. Also I made my own mailbox implementation which uses the eCos Mailbox
API to implement the actual message queue, the only thing my mailbox does
extra is trigger the semaphore every time a message is placed in the queue,
so that the receive process will start. The sending process only has to
place the message in the correct mailbox, which corresponds to the priority
of the message.....

Greetings,
   Han
-----Original Message-----
From: ecos-discuss-owner@ecos.sourceware.org
[mailto:ecos-discuss-owner@ecos.sourceware.org] On Behalf Of Gorjup Matthias
Sent: dinsdag 29 juni 2004 12:48
To: ''Ecos-Discuss (E-Mail)'
Subject: [ECOS] FW: [ECOS] Mailboxes - priorities of messages

Hello Andrew,

Here are some details of our mBox problem;

When more than one thread (task) is using the same mBox to communicate with
one another thread, the send/received mails(messages) has to be kept in a
message qeue. ( or they arrive to mBox and kept in an order qeue). 

In this message qeue, we need to put the process of the messages (mails) in
a prioritisation. For example , a critical mail send by a timeout function
has to be processed before a user request mail which is send through the
same mBox to the same thread.

I hope this gives you enough info.

Regards.
Tolga

   

-----Original Message-----
From: Gorjup Matthias
To: 'Tolga SIMSEK' (E-Mail)
Sent: 29.06.2004 12:34
Subject: WG: [ECOS] Mailboxes - priorities of messages



-----Ursprungliche Nachricht-----
Von: Andrew Lunn [ mailto:andrew@lunn.ch <mailto:andrew@lunn.ch> ]
Gesendet: Dienstag, 29. Juni 2004 11:29
An: Gorjup Matthias
Cc: 'ecos-discuss@ecos.sourceware.org' 
Betreff: Re: [ECOS] Mailboxes - priorities of messages 


On Tue, Jun 29, 2004 at 10:02:32AM +0200, Gorjup Matthias wrote: 
> Hello,
> 
> we are porting a special ethernet driver to eCos and we would need to 
> implement prioritozed mailbox messages for communication between
threads. Is 
> it possible to use priorities for mbox messages? If not, is there some

> workaround or another solution that we could use? 

Prioritized could mean many different things. Please could you be more
specific. Are you talking about the threads blocking for access to the mbox,
the messages withing the mbox, or some other priority feature. 

        Andrew 

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