Multhearding using PyQt5

Dayama Pradeep

Hello,

Trying to experiment with PyQt5 Qthreads, where in trying with multi thread.
Below is the thread class

//import sys
import time
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *


from PyQt5.QtCore import (QCoreApplication, QObject, QRunnable, QThread,
                          QThreadPool, pyqtSignal)

# Subclassing QThread
# http://qt-project.org/doc/latest/qthread.html
class serial_thread(QThread):  
   def __init__(self):
      super(serial_thread, self).__init__()
      self.TIME_INTERVAL = 5
      self.ctimer = QTimer() 
      self.direction = 'T'
      self.ctimer.timeout.connect(self.readWriteData)            

   def readWriteData(self):
      if(self.direction == 'T'):
         self.direction = 'R'
         print('inside Transmit') 
      elif(self.direction == 'R'):
         self.direction = 'T'
         print('inside Receive')
      
   def receive_info(self):
      print('inside Recieve info')    
      self.start()
      
   def run(self):
      print('inside run')
      self.ctimer.start(self.TIME_INTERVAL)  
      self.exec_()

   def stop(self):
      #self._isRunning = False
      self.terminate()
      self.wait()
      self.ctimer.stop()
      print('thread is been stopped')

from main theard. creating 2 instances of child theards

for i in range(2):
        self.serial_thread[i] = serial_thread()

when start is clicked from UI, thread starts, as shown below

self.serial_theard[index].receive_info()

when stop is clicked from UI, thread stops, as shown below

self.serial_theard[index].stop()

Issue: The thread is not been stopped once stop is clicked from UI. it goes in stop function but readWriteData function keeps executing
There are 2 tabs in UI, where in each tab is to associated with each thread object, the above issue happens only once 1 tab (thread)is started, and the same tab (thread )is closed or stopped

please help me.

thanks

SGaist

Hi,

Calling terminate is not a good idea like explained in the documentation. Since you are using the thread's event loop, you should call quit and then wait.

Also, you have several threads, are you sure you are stoping them all ?

Dayama Pradeep

@SGaist Okay, Got it,. Actually tired a different way of multithreading using Qthreads.. and as of now it seems to be working.. I used move to thread.. and doing same.. as u suggested.. quit and wait

SGaist

How did you use moveToThread ?

Dayama Pradeep

well.. implemented in similar fashion as shown in below link

https://stackoverflow.com/questions/6783194/background-thread-with-qthread-in-pyqt

SGaist

What if you call quit in place of terminate ?