This changes the buildlink3.mk files to use an include guard for the
recursive include. The use of BUILDLINK_DEPTH, BUILDLINK_DEPENDS,
BUILDLINK_PACKAGES and BUILDLINK_ORDER is handled by a single new
variable BUILDLINK_TREE. Each buildlink3.mk file adds a pair of
enter/exit marker, which can be used to reconstruct the tree and
to determine first level includes. Avoiding := for large variables
(BUILDLINK_ORDER) speeds up parse time as += has linear complexity.
The include guard reduces system time by avoiding reading files over and
over again. For complex packages this reduces both %user and %sys time to
half of the former time.
The latest code is only found in the boehm-gc CVS repository (see
Makefile.version for information). I had to take this from there,
as there were bug fixes.
This library was imported primarily for the [hopefully]
upcoming audio/pulseaudio package.
TODO: Add support for NetBSD atomic ops?
This package provides semi-portable access to hardware provided
atomic memory operations. These might allow you to write code:
- That does more interesting things in signal handlers.
- Makes more effective use of multiprocessors by allowing you to write
clever lock-free code. Note that such code is very difficult to get
right, and will unavoidably be less portable than lock-based code. It
ia also not always faster than lock-based code. But it may occasionally
be a large performance win.
- To experiment with new and much better thread programming paradigms, etc.
As the latest code for this library is only available via CVS, this package
provides a snapshot.
