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SubjectRe: Some very thought-provoking ideas about OS architecture.
somebody wote :

> difference between the implementation of
>
> read(fd,buf,sz)
> and
> fd->CALL(OP_READ,buf,sz)

I might be off track here , but is the second line anyhow related to
object oriented programming ?

Then the difference is mostly in the syntax , because on lower level the
second line get translated to :

read_nr_32( fd , buf,sz)

The correct method/function is choosen and called with the additional
"implicit" parameter , a pointer to the object.
The correct function can be found at compile time or run time,
when using virtual methods.

Now what I understood under sending messages in OS is :

message_type *m;
m = <the contents of the message>
send_message(m [ , destination ] ) ;

So the execution will not neccesarily be transfered to another piece of code.
Just the message would be transfered to some mailbox.

This is ( more or less ) how AmigaOS works. For example a task sends a message to
the filesystem "do this" , the message is sent and the task continues its bussiness.
The filesystem , which is another task , reads the message , does something and
sends a reply.

Well , just some thoughts of mine ...

--
David Balazic , student
E-mail : 1stein@writeme.com | living in sLOVEnija
home page: http://surf.to/stein
Computer: Amiga 1200 + Quantum LPS-340AT
--

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