python線程池極簡教程

實現代碼

import multiprocessing as mp
import time
import random
import subprocess
import logging
logger = mp.log_to_stderr(logging.WARN)

def popen_wrapper(i):
    logger.warn('echo "hi"')
    return i

def log_result(retval):
    results.append(retval)

if __name__ == '__main__':
	#15個任務
    num_to_run = 15
    #線程池中3個進程
    max_parallel = 3
    results = []

    pool =  mp.Pool(max_parallel)
    for i in range(num_to_run):
        pool.apply_async(popen_wrapper, args=(i,), callback=log_result)
    pool.close()
    pool.join()

    logger.warn(results)

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