Is it safe to compile multiple ports at the same time ?

[Edwin Groothuis]

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:
> 
> port A depends on X
> port B depends on X
> 
> 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?

You have to obtain a lock on the X's Makefile before you are doing
to check if you have this port installed.

For example, a dependcy on pkg-config in the directory devel/pkgconfig:

- obtain lock on devel/pkgconfig/Makefile
- check if pkg-config exists, and if not, build and install it.
- release lock on devel/pkgconfig/Makefile


> Ofcourse if B depends also on Y it can fallback to building Y if it
> cannot gain exclusive lock on X.

Building one port is a serial process, building multiple ports can
be a parallel process.

Edwin

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