Python如何与两个不同的线程(A类，B类)共享一个串行端口

我有一个Python进程，该进程使用串行端口(唯一资源)，该串行端口使用类A的实例进行管理.存在使用类B和C的实例初始化的两个不同的线程，这些线程一直在使用串行通过已经创建的对象来移植资源.

I have a single Python process which is using a serial port (unique resource) which is managed using an instance of a class A. There exists two different threads initialized using instances of classes B and C, which are constantly using the serial port resource through the objected already created.

import threading

Class A(threading.Thread):
    #Zigbee serial port handler
    def __init__(self,dev):
        #something here that initialize serial port
    def run():
        while True:
            #listening serial interface
    def pack(self):
        #something
    def checksum(self):
        #something
    def write(self):
        #something

Class B(threading.Thread):
    def __init__(self,SerialPortHandler):
        self.serialporthandler=SerialPortHandler
    def run(self)
        while True:
            #something that uses self.serialporthandler

Class C(threading.Thread):
    def __init__(self,SerialPortHandler):
        self.serialporthandler=SerialPortHandler
    def run(self)
        while True:
            #something that uses self.serialporthandler

def main():
    a=A('/dev/ttyUSB1')
    b=B(a)
    b.start()
    c=C(a)
    c.start()

if __name__=='main':
    while True:
        main()

问题是两个线程都试图同时访问串行资源.我可以使用几个相同类A的实例，在敏感部分中附加Lock.acquire()和Lock.release().

The problem is that both threads are trying to access the serial resource at the same time. I could use several instances of the same class A, attaching Lock.acquire() and Lock.release() in the sensitive parts.

你们中的一些人能指出我正确的方向吗?

Could some of you point me to the right way?

谢谢.