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Content-type: text/plain
Fyodor,
we had a look at your small example program (not sent to the mailing list).
Basically the snippet amounts to
start := Services.Ticks();
FOR n := 1 TO 10 DO
...
REPEAT
x := Math.Sqrt( n )
UNTIL Services.Ticks() > start + n * Services.resolution;
...
END
As it turns out, your command sits indeed for about 10 seconds in a loop
without letting BlackBox 'breath' in its own main loop.
There are two solutions for this.
(1.) Cooperative multitasking: Chop your program into really small chunks
and use Services.Actions. Please refer to ObxActions for an example.
(2.) Use Werner Braun's "Multithreading with Processes" pattern. I've
attached below excerpts from Werner's emails dated 20th February 2003
explaining his solution. As a side note: Try adding the command line
parameter "/EMBEDDING" to your slave BlackBox process. This way, your
communication engine will not open its main window.
Cheers
Marc
Oberon microsystems, Inc.
From: Werner Braun [wb{([at]})nowhere.xy
Sent: Donnerstag, 20. Februar 2003 08:48
To: blackbox{([at]})nowhere.xy
Subject: Re: Multithreading
There is another way to provide "Multi-Tasking" with BlackBox.
(1.) BlackBox.exe accepts command-line Parameters. Open a Shell, change to
the BlackBox directory and enter: BlackBox.exe /par "my parameter list".
Within the called BlackBox instance you can access the parameters by the
variable Dialog.commandLinePars
(2.) You can start any external program from within BlackBox using
HostDialog.Start.
Now implement this:
Master-Process
=======
Call slave-process HostDialog.Start("BlackBox /par 'my parameters or
param-file' "). Use a Services.Action for polling if the file
"Slave-running.empty" still exists. After the file is gone, read in the data
out of the param-file or any other data-file.
Slave-Process
======Modify module Config to check if some parameters have been passed. Create
file "Slave-running.empty". Read in parameter list or file. Do (blocking)
stuff, write data-file. Delete file "Slave-running.empty". Exit using
Kernel.Quit(0) (which prevents opening Pop-Up-Boxes).
The several BlackBox instances can also communicate over TCP/IP using the
module CommTCP. That's what our Web-Application-Server can do. One
Master-process (server) uses several Slave-Processes (workers) and they
communicate using CommTCP.
You can simply send data around using Stores.Writers. Write the data to a
file. Copy the file via a TCP/IP stream. Read the data from the resulting
file using Strores Readers. ... And voila you have "poor man's CORBA".
Besides some drawbacks (performance) there is one big advantage using TCP/IP
instead of threads: The co-operating processes can run on different machines
if you like.
Werner Braun
--------------------------------------------
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Received on Sat May 22 2004 - 10:54:14 UTC