[clean-list] Process starting

[Marco Kesseler]

Arjen van Weelden schreef:
> Hernyák Zoltán wrote:
>> Because my task is to write programs which sends and receives data 
>> from outside.
>> This is a kind of port-reading-writing problems, where on the other 
>> side a 3rd party
>> program processes the data elements.
>>
>> The main program is a kind of:
>>
>> Start w =
>>    #! w = sendAllData [1...10000] w
>>    #! (result,w) = receiveAllData w
>>   = result
>>
>> This cannot work, because until all the elements of [1..1000] is not 
>> sended,
>> nothing is received. Let suppose, the 3rd party program reads one 
>> data element from the
>> port, and sends it back immediately on a synchronized way. So until 
>> the succesfull receiving it won't
>> read another data element from the port. The only idea is to solve is 
>> that:
>>
>> Start w =
>>    #! w = sendAllData_OnSeparateThread [1...10000] w
>>    #! (result,w) = receiveAllData w
>>   = result
>>
>> So it can't be solved in Clean?? I barely think that :)
>>
>> Zoltan Hernyak
>
> It still looks as if two separate programs, or a single program 
> started twice, could solve your problem, in combination with a TCP/IP 
> library.
That depends I guess, on whether the writer should communicate with the 
sender while they are both doing their job, and how complex this 
interaction is. I think it would not be far-fetched if the sender sends 
different data, depending on the reply so far.

Personally, I think that support for multi-threaded execution would be a 
serious enhancement. I wouldn't mind a small performance hit.

> Anyway, the example I sent you can be combined with Clean's TCP/IP 
> library to do just that. The TCP/IP library, which is part of Object 
> I/O, can also be used without Object I/O. Just select an unused port 
> and setup a server in the main thread that receives data from the 
> separate thread/process client. Take a look at ...Clean 
> 2.1.1\Examples\Tcp Examples\chat\chat{Client|Server}.icl. This can 
> easily be incorporated into the example containing newProcess that I 
> sent you.
>
> regards,
>     Arjen
>
> (one more thing: don't use so many #!'s, they are hardly ever necessary)
>
Well, that depends on your view of what constitutes the most readable 
program :-)

For example, I actually have come to apreciate writing brackets instead 
of relying on priorities...

And once in a while, I find the indentation rules annoying, and the 
semicolon becomes my friend...

(couldn't resist)

cheers,
Marco