From owner-freebsd-questions  Mon Oct 30  1:47:44 2000
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From: Mike Meyer <mwm@mired.org>
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Date: Mon, 30 Oct 2000 03:47:34 -0600 (CST)
To: <jay.krell@cornell.edu>
Cc: <questions@freebsd.org>
Subject: Re: make install multiprocess safe?
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jay.krell@cornell.edu types:
> Imho it should be more safe.
> Even concurrent builds in the same directory should work better -- one
> should notice the other and either wait or abort.

Well, once you patch the files in /usr/ports/Mk to do that, use
send-pr to submit them.

	<mike

>  ..Jay
> 
> -----Original Message-----
> From: Mike Meyer <mwm@mired.org>
> To: jay.krell@cornell.edu <jay.krell@cornell.edu>
> Cc: questions@freebsd.org <questions@freebsd.org>
> Date: Sunday, October 29, 2000 11:31 AM
> Subject: Re: make install multiprocess safe?
> 
> 
> >jay.krell@cornell.edu writes:
> >> This has been bugging me a while. I've always just avoided it.
> >> Is it safe to
> >>     cd /usr/ports/1/2
> >>     make install &
> >>     cd /usr/ports/3/4
> >>     make install
> >> ?
> >
> >Mostly it's safe.
> >
> >> if both go to like register the package at about the same time, will the
> >> package database stay not corrupted?
> >
> >The "packages database" is a collection of flat text files. You only
> >get into problems if you try writing to the same one at the same time.
> >
> >> I'm assuming both have all their dependents installed or they share no
> >> dependents -- to avoid the question of building in the same directory at
> the
> >> sam etime.
> >
> >*That's* the real problem: dependencies. If both ports depend on the
> >same third package, and they both start writing on the +REQUIRED_BY
> >file at the same time, it could mess up that file. On the other hand -
> >that's not a major breakage; it just means that you don't get warned
> >about all the dependencies when you remove the third package. As
> >opposed to what happens when the two makes start trying to build the
> >same package, which tends to break that build.
> >
> >If no package in system is directly required by more than one unbuilt
> >package in the tree of dependents, you will be safe. Given that all
> >the dependents of the two ports are built, this means that no package
> >is directly required by both ports.
> >
> > <mike
> 
> 


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