import platform

# Some tests perform deep recursion, which requires a larger pthread stack size
# than the relatively low default of 192 KiB for 64-bit processes on AIX. The
# `AIXTHREAD_STK` environment variable provides a non-intrusive way to request
# a larger pthread stack size for the tests. Various applications and runtime
# libraries on AIX use a default pthread stack size of 4 MiB, so we will use
# that as a default value here.
if 'AIXTHREAD_STK' in os.environ:
    config.environment['AIXTHREAD_STK'] = os.environ['AIXTHREAD_STK']
elif platform.system() == 'AIX':
    config.environment['AIXTHREAD_STK'] = '4194304'