Python进程间通信Queue

2022年5月7日 22:38 by wst

python高级

进程之间可以通过multiprocessing的Queue实现通信,下面举例说明。

from multiprocessing import Queue, Process
import time

def write_task(q: Queue):
    """ 向队列中写入数据 """
    if not q.full():
        for i in range(5):
            message = "消息" + str(i)
            q.put(message)
            print("写入:%s" % message)



def read_task(q: Queue):
    """ 从队列读取数据 """
    time.sleep(1)
    while not q.empty():
        # 等待两秒,如果还没有读到信息就抛出Queue.Empty异常
        print("读取:%s" % q.get(True, 2))


if __name__ == "__main__":
    print("父进程开始...")
    q = Queue()                                 # 父进程创建Queue并传递给各个子进程
    pw = Process(target=write_task, args=(q,))  # 实例化写入队列的子进程
    pr = Process(target=read_task, args=(q,))   # 实例化读取队列的子进程
    pw.start()                                  # 启动子进程pw,写入消息
    pr.start()                                  # 启动子进程pr,读取消息
    pw.join()                                   # 等待pw结束
    pr.join()                                   # 等待pr结束
    print("-----父进程结束------")

 


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