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"""Module with utilities related to async operations"""
import sys
import os
def cpu_count():
""":return:number of CPUs in the system
:note: inspired by multiprocessing"""
num = 0
try:
if sys.platform == 'win32':
num = int(os.environ['NUMBER_OF_PROCESSORS'])
elif 'bsd' in sys.platform or sys.platform == 'darwin':
num = int(os.popen('sysctl -n hw.ncpu').read())
else:
num = os.sysconf('SC_NPROCESSORS_ONLN')
except (ValueError, KeyError, OSError, AttributeError):
pass
# END exception handling
if num == 0:
raise NotImplementedError('cannot determine number of cpus')
return num
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