Date: Wed, 17 May 2006 09:21:47 +0300 From: Vasil Dimov <vd@FreeBSD.org> To: Edwin Groothuis <edwin@mavetju.org> Cc: ports@freebsd.org, Paul Koch <paul.koch@statseeker.com> Subject: Re: Is it safe to compile multiple ports at the same time ? Message-ID: <20060517062147.GA42089@qlovarnika.bg.datamax> In-Reply-To: <20060517061302.GR1116@k7.mavetju> References: <200605171353.37745.paul.koch@statseeker.com> <20060517045403.GI1113@k7.mavetju> <200605171508.07228.paul.koch@statseeker.com> <20060517060026.GA40653@qlovarnika.bg.datamax> <20060517061302.GR1116@k7.mavetju>
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On Wed, May 17, 2006 at 04:13:02PM +1000, Edwin Groothuis wrote:
> On Wed, May 17, 2006 at 09:00:26AM +0300, Vasil Dimov wrote:
> > Not really, locking will just prevent breakages. Let me illustrate my
> > thought with an example:
> >=20
> > port A depends on X
> > port B depends on X
> >=20
> > You start building A which results in building X via exclusive lock on =
X.
> > During the build of X you decide to build B which results in building X
> > (X is not yet installed) but you block trying to acquire the exclusive
> > lock on X so you wait _idling_ until building of X is done. Furthermore
> > what do you suggest to do when the lock is released?
>=20
> You have to obtain a lock on the X's Makefile before you are doing
> to check if you have this port installed.
>=20
> For example, a dependcy on pkg-config in the directory devel/pkgconfig:
>=20
> - obtain lock on devel/pkgconfig/Makefile
What do you do if that is already locked?
> - check if pkg-config exists, and if not, build and install it.
> - release lock on devel/pkgconfig/Makefile
>=20
>=20
> > Ofcourse if B depends also on Y it can fallback to building Y if it
> > cannot gain exclusive lock on X.
>=20
> Building one port is a serial process, building multiple ports can
> be a parallel process.
>=20
Agreed.
--=20
Vasil Dimov
gro.DSBeerF@dv
Testing can show the presence of bugs, but not their absence.
-- Edsger W. Dijkstra
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