【Python】进程池与线程池

import time, random, os
from concurrent.futures import ProcessPoolExecutor,ThreadPoolExecutor


def task(name):
    print('name:%s pid:%s run' % (name, os.getpid()))
    time.sleep(random.randint(1,3))


if __name__ == '__main__':
    # pool = ProcessPoolExecutor(4)  # 限定4个进程
    pool = ThreadPoolExecutor(4)   # 限定4个线程

    for i in range(10):  # 同时开10个, 多出来的进程/线程只能阻塞
        pool.submit(task, 'caya-%s' % i)

    pool.shutdown(wait=True)  # 关闭进程池,相当于join  默认 wait=True 所有进程/线程结束池才能关闭

    try:
        pool.submit(task, 'caya-%s' % 999)  # 关闭进程池后不可加入
    except RuntimeError as e:
        print(e)
    print('main')