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#-----------------------------------------------------------------------------
# Copyright (c) 2005-2023, PyInstaller Development Team.
#
# Distributed under the terms of the GNU General Public License (version 2
# or later) with exception for distributing the bootloader.
#
# The full license is in the file COPYING.txt, distributed with this software.
#
# SPDX-License-Identifier: (GPL-2.0-or-later WITH Bootloader-exception)
#-----------------------------------------------------------------------------
import sys
import multiprocessing
def f(x):
return x * x
def main(start_method):
multiprocessing.set_start_method(start_method)
# Start a pool with 4 worker processes.
with multiprocessing.Pool(processes=4) as pool:
print('Evaluate f(10) asynchronously...')
result = pool.apply_async(f, [10])
assert result.get() == 100
print('Evaluate f(0..9)...')
assert pool.map(f, range(10)) == [x**2 for x in range(10)]
if __name__ == '__main__':
multiprocessing.freeze_support()
if len(sys.argv) != 2:
print(f"Usage: {sys.argv[0]} <start-method>")
sys.exit(1)
main(sys.argv[1])
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