[英]Python multiprocessing queue not sending data to parent process
So I've got a bluetooth connection from an arduino reading a joystick and sending the axis readout over bluetooth to my raspberry pi (4b running ubuntu 20.10).所以我从 arduino 获得了蓝牙连接,读取操纵杆并将轴读数通过蓝牙发送到我的树莓派(4b 运行 ubuntu 20.10)。 I've confirmed it's receiving this data too.
我已经确认它也收到了这些数据。
Now I try to run this bluetooth communcication in a separate process using the python multiprocessing module.现在我尝试使用 python 多处理模块在单独的进程中运行此蓝牙通信。 to access the data from the arduino, I give the function a queue from the parent main process to put the data in there.
为了从 arduino 访问数据,我给 function 一个来自父主进程的队列,以便将数据放入其中。 Then in the main function I continuously try to read from this queue and process the data there.
然后在主 function 中,我不断尝试从该队列中读取并处理那里的数据。
The queue in the parent process always remains empty, however, and as such I can't process the data any further.但是,父进程中的队列始终为空,因此我无法进一步处理数据。
How can I get the data from the bluetooth process back to the main process?如何将蓝牙进程中的数据返回到主进程?
main.py
#!/usr/bin/env python3
import time
import logging
import multiprocessing as mp
import bluetoothlib
logging.basicConfig(level=logging.DEBUG)
logging.info("creating queue")
global q
q = mp.Queue()
def main():
try:
logging.info("starting bluetooth process")
p = mp.Process(target=bluetoothlib.serlistener, args=(q,))
p.start()
except:
logging.error("unable to start bluetooth listener")
logging.info("start reading from queue")
while True:
#logging.info(q.qsize())
if not q.empty():
mss = q.get()
logging.info(mss)
#do something with data
elif q.empty():
logging.info("queue empty")
time.sleep(1)
main()
bluetoothlib.py
#!/usr/bin/env python3
import os
import serial
import io
def serlistener(q):
print ("creating connection")
btConn = serial.Serial("/dev/rfcomm0", 57600, timeout=1)
btConn.flushInput()
sio = io.TextIOWrapper(io.BufferedRWPair(btConn, btConn, 1),encoding="utf-8")
print ("connection created, starting listening")
while btConn.is_open:
try:
mss = sio.readline()
q.put(mss)
except:
print("error")
break
At thelizardking34's suggestion, I relooked at the global stuff I'd been messing with and after correcting it, the code as now given in the question works.在 thelizardking34 的建议下,我重新查看了我一直在搞乱的全局内容,在更正之后,问题中给出的代码有效。
Thanks to thelizardking34!感谢蜥蜴王34!
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