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From: dillon@CORY.BERKELEY.EDU (Matt Dillon)
Newsgroups: comp.sys.amiga
Subject: Re: MCC pipes
Message-ID: <8706240726.AA06112@cory.Berkeley.EDU>
Date: Wed, 24-Jun-87 03:26:46 EDT
Article-I.D.: cory.8706240726.AA06112
Posted: Wed Jun 24 03:26:46 1987
Date-Received: Fri, 26-Jun-87 04:14:53 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
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>I don't know what version I'm talking about. Did you write the PIPE: device
>in the MCC toolkit, as well as the one whose source is floating around (that
>is, are they the same program)? It may well be a very early version that I'm
>using here. Let me check:

	Slight misunderstanding... you were talking about the MCC PIPE:, and
I was talking about my PIPE: (I did not write the MCC pipe... I'm not 
connected with them in any way).

>> 	VD0: is quite a bit more than the measily 2.5Meg I've got.  I can use
>> 	an infinite buffer size for the second PIPE: because Restore can
>> 	read data much faster than the decompressor can decompress it.  
>
>But because of this, the pipe will always be almost empty, so you might as well
>give it a 4K buffer size as well. It might be noted here that the UNIX pipes
>have a 4K buffer size.

	If the program writing to the pipe has a large buffer size (8K is
not uncommon), then it will block every time it does a write until the reader
is ready.  Thus, to completely ensure the program does not block (assuming
the reader can read it faster), the pipe would have to be a bit larger...
say 16K.


>Now, a question and a request:
>
>Does your new PIPE: support the packets Examine and ExNext use? If so, then you
>could just "dir pipe:" to get a list of active pipes, right?

	I've been trying... and trying... and trying...  I can't figure
out why it is crashing....  Can somebody post a *working* device driver
which uses Examine/ExNext????

>The request: I want to use your PIPE: device as the skeleton for an improved
>console device. May I? How would I use it with Aztec (compatibility mode for
>sure, right)? Can I call Intuition from a device (opening windows, etc) or do
>I have to handcraft windows from the lower level primitives? I assume the
>former, but I've visited the Guru enough to know how often my assumptions are
>unwarranted.
	
	Anybody who wishes is certainly welcome to strip my source and use
it as a skeleton.  Since it is copyright, I have to give my permission:
You have my permission (reasonable approximation of my signature: Matthew
Dillon).  Poof, done.  Anybody who needs the source can also mail me
directly and I'll send it to him/her.

	Devices are processes.  Thus, you can call any library you wish.
However, you have to be careful not to make a library call that will result
in DOS trying to talk to your process.  You can even open-up a CON: window
and write to it... though that is *very* precarious.

				-Matt