From:	Richard Dawe <richdawe AT bigfoot DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: virtual MUltiCPU - compiling on more than one computer
Date:	Sat, 19 Feb 2000 00:01:55 +0000
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To:	djgpp AT delorie DOT com
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Hello.

Eli Zaretskii wrote:
> leon wrote:
<snip>
> > It is possible then for make to run multiple compilers on SINGLE
> > system with multi CPU - that is certainly an advantage.
<snip>
> We could make it work on Windows (by using the START command), but we'd
> need to solve the problem of communications between Make and its
> children, since START launches a separate Virtual Machine, and
> communications between VMs are tricky for DOS programs.

What form of communication does make use to communicate between different
processes? I ask this because you could probably use the Unix domain
socket support in the development version of libsocket to communicate the
DOS boxes. Here's how I envisage it working:

1. Master make creates a datagram Unix domain socket for co-ordinating
makes, e.g. with a name like /tmp/make/<pid>

[ Note that the namespace used by libsocket Unix domain sockets is
  separate to the filesystem namespace. ]

2. Master make "starts" a child make, passing it the Unix domain socket
path as a command-line argument.

3. Child make creates a datagram Unix domain socket for communication with
master make.

4. Child make informs master make of the address of its Unix domain
socket.

5. Master make spawns off lots of children using steps 1-4.

How easy would it be to add this to make?

Bye,

-- 
Richard Dawe
richdawe AT bigfoot DOT com ICQ 47595498 http://www.bigfoot.com/~richdawe/

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