def get_num_build_jobs():
"""
Get number of parallel build jobs set by the --parallel command line
argument of setup.py
If the command did not receive a setting the environment variable
NPY_NUM_BUILD_JOBS checked and if that is unset it returns 1.
Returns
-------
out : int
number of parallel jobs that can be run
"""
from numpy.distutils.core import get_distribution
envjobs = int(os.environ.get("NPY_NUM_BUILD_JOBS", 1))
dist = get_distribution()
# may be None during configuration
if dist is None:
return envjobs
# any of these three may have the job set, take the largest
cmdattr = (getattr(dist.get_command_obj('build'), 'parallel', None),
getattr(dist.get_command_obj('build_ext'), 'parallel', None),
getattr(dist.get_command_obj('build_clib'), 'parallel', None))
if all(x is None for x in cmdattr):
return envjobs
else:
return max(x for x in cmdattr if x is not None)
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