python – Stomp.py从侦听器返回消息

线程切换的一个简单示例是使用带有锁定的共享变量,并在接收器线程接收到消息时更新该变量.并且,在另一个线程中读取该变量,但是您需要使用适当的同步机制来确保不覆盖该消息,并且不会遇到死锁.

下面是使用带锁定的全局变量的示例代码.

rcvd_msg = None
lock = thread.Condition()

# executed in the main thread
with lock:
    while rcvd_msg == None:
        lock.wait()
    # read rcvd_msg
    rcvd_msg = None
    lock.notifyAll()

class Listener(ConnectionListener):      

    def on_message(self,headers,message):
        # executed in the receiver thread
        global rcvd_msg,lock
        with lock:
            while rcvd_msg != None:
                lock.wait()
            rcvd_msg = message
            lock.notifyAll()

希望有所帮助!!