Newsgroups: comp.sys.transputer
From: "Alberto Chessa" <achessa@fiar.finmeccanica.it>
Subject: About virtual channels (2)
Organization: FIAR S.p.A.
Date: 28 May 1998 14:04:00 GMT
Message-ID: <01bd8a41$c214eae0$92c809c0@chessa>

Sorry, I forget to make the following questions in my previous message
about the virtual channels implementaion (ANSI C Toolset):

What appends when one process is blocked on a ChanOut on a virtual channel
and another process send another message on a virtual channel mapped on the
same link ?
The second process will block until the first one will terminate the
transfer ?

What appends if the first process is a low priority and the second one is
an high priority (and vice versa)  and if they have the same priority ?

I suppose the runtime C toolset adds a process (high-priority) that will
route the messages on the channels (virtual links, identified by a message
header added by the ruter) and that it's able to immediatly serve the
transfer on the link, but what append when the destination process is not
ready ? The router will hold on ? A single ChanOut will be break into two
ChanOut (one for the header and one for the message,  causing
rescheduling!) ?
 
(I searched my documentation but I was not able to retrive any info on
virtual channel but the configuration instructions)

Thanks