Pygame。 Windows10。使用ProcessPoolExecutor在loop.run_in_executor之后创建其他窗口。

Question

再现问题的环境：

OS：Windows 10（主机）
处理器：8
的Python：3.6.6
pygame版本：1.9.4
“生成器”：cx_Freeze版本5.1.1

未复制问题的环境：

OS：Ubuntu 14.04（guest，virtualbox）
处理器：4
的Python：3.6.6
pygame版本：1.9.4
“生成器”：cx_Freeze版本5.1.1

脚本

import asyncio
import pygame
import multiprocessing

from concurrent.futures import ProcessPoolExecutor
from concurrent.futures import ThreadPoolExecutor


def init():
    pygame.init()
    screen = pygame.display.set_mode((900, 700), pygame.RESIZABLE)
    clock = pygame.time.Clock()
    return screen, clock


def fast_cpu_blocked():
    print("blocked is run")
    i = 1
    while 1:
        i += 1
        if i > 100000000:
            print("blocked is finished")
            return i


executor_threads = ThreadPoolExecutor(multiprocessing.cpu_count())
executor_processes = ProcessPoolExecutor(multiprocessing.cpu_count())


async def start():
    loop = asyncio.get_event_loop()
    cpu_run = False
    screen, clock = init()
    while 1:
        await loop.run_in_executor(None, clock.tick, 60)
        screen.fill((0, 0, 0))
        txt_surface = pygame.font.Font(None, 18).render(
            "FPS: {}".format(int(clock.get_fps())), True, pygame.Color('grey'))
        screen.blit(txt_surface, (0, 0))
        pygame.display.flip()
        if not cpu_run:
            print("RUN CPU TASK")
            cpu_run = True
            loop.run_in_executor(executor_processes, fast_cpu_blocked)
            print("FINISH CPU TASK")


if __name__ == "__main__":
    loop = asyncio.get_event_loop()
    loop.run_until_complete(start())

问题：

执行loop.run_in_executor(executor_processes, fast_cpu_blocked)时，它会生成多个应用程序窗口（只是黑色窗口，没有任何呈现的上下文）。

使用executor_threads代替executor_processes不会发生这种情况。但是无论如何我都需要executor_processes，所以这只是事实。

登录Windows：

pygame 1.9.4
Hello from the pygame community. https://www.pygame.org/contribute.html
RUN CPU TASK
FINISH CPU TASK
pygame 1.9.4
Hello from the pygame community. https://www.pygame.org/contribute.html
blocked is run
pygame 1.9.4
Hello from the pygame community. https://www.pygame.org/contribute.html
pygame 1.9.4
Hello from the pygame community. https://www.pygame.org/contribute.html
pygame 1.9.4
Hello from the pygame community. https://www.pygame.org/contribute.html
pygame 1.9.4
Hello from the pygame community. https://www.pygame.org/contribute.html
pygame 1.9.4
Hello from the pygame community. https://www.pygame.org/contribute.html
pygame 1.9.4
Hello from the pygame community. https://www.pygame.org/contribute.html
pygame 1.9.4
Hello from the pygame community. https://www.pygame.org/contribute.html
blocked is finished

登录Ubuntu：

pygame 1.9.4
Hello from the pygame community. https://www.pygame.org/contribute.html
RUN CPU TASK
FINISH CPU TASK
blocked is run
blocked is finished

问题：

如何修复/避免/破解Windows系统上的多个窗口。
以及为什么会发生？

Answer 1

使用cx_Freeze为Windows创建exe并使用某种形式的多处理（例如multiprocessing或concurrent.futures.ProcessPoolExecutor）时，您需要引导exe进行多处理您要做的第一件事就是简单地通过在if __name__ == "__main__":块中调用multiprocessing.freeze_support()作为第一件事。