Buildman uses all available CPUs by default, so running more than one or
two concurrent processes is not normally useful.
However in some CI cases we want to be able to run several jobs at once
to save time. For example, in a lab situation we may want to run a test
on 20 boards at a time, since only the build step actually takes much
CPU.
Add an option which allows such a limit. When buildman starts up, it
waits until the number of running processes goes below the limit, then
claims a spot in the list. The list is maintained with a temporary file.
Note that the temp file is user-specific, since it is hard to create a
locked temporary file which can be accessed by any user. In most cases,
only one user is running jobs on a machine, so this should not matter.
Signed-off-by: Simon Glass <sjg@chromium.org>
The patman directory has a number of modules which are used by other tools
in U-Boot. This makes it hard to package the tools using pypi since the
common files must be copied along with the tool that uses them.
To address this, move these files into a new u_boot_pylib library. This
can be packaged separately and listed as a dependency of each tool.
Signed-off-by: Simon Glass <sjg@chromium.org>
