PySide2: problem with starting QThread with a signal when using debugger Follow

Hi,

Could you please provide sample code for reproducing?

The one from this post isn't exactly the same since it uses Python 2.7.15 and different PyCharm version.

Below is a piece of code I copied, and modified, from Stack Overflow using three different methods of threading.  QObject.moveToThread() does not run in a new thread in 2019.2. The code below works fine in:

PyCharm 2018.3.7 (Community Edition)
Build #PC-183.6156.16, built on July 9, 2019
JRE: 1.8.0_152-release-1343-b28 amd64
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
Windows 7 6.1

####### start code ###############

import sys
import time

from PySide2.QtCore import (QCoreApplication, QObject, QRunnable, QThread,
QThreadPool, Signal)

# Subclassing QThread
# http://qt-project.org/doc/latest/qthread.html
class AThread(QThread):

def run(self):
count = 0
while count < 5:
time.sleep(1)
print("A Increasing")
count += 1

# Subclassing QObject and using moveToThread
# http://blog.qt.digia.com/blog/2007/07/05/qthreads-no-longer-abstract
class SomeObject(QObject):

finished = Signal()

def long_running(self):
count = 0
while count < 5000:
time.sleep(1)
print("B Increasing")
import pydevd;pydevd.settrace(suspend=False)
count += 1
self.finished.emit()

# Using a QRunnable
# http://qt-project.org/doc/latest/qthreadpool.html
# Note that a QRunnable isn't a subclass of QObject and therefore does
# not provide signals and slots.
class Runnable(QRunnable):

def run(self):
count = 0
app = QCoreApplication.instance()
while count < 5:
print("C Increasing")
time.sleep(1)
count += 1
app.quit()

def using_q_thread():
app = QCoreApplication([])
thread = AThread()
thread.finished.connect(app.exit)
thread.start()
sys.exit(app.exec_())

def using_move_to_thread():
app = QCoreApplication([])
objThread = QThread()
obj = SomeObject()
obj.moveToThread(objThread)
obj.finished.connect(objThread.quit)
objThread.started.connect(obj.long_running)
objThread.finished.connect(app.exit)
objThread.start()
sys.exit(app.exec_())

def using_q_runnable():
app = QCoreApplication([])
runnable = Runnable()
QThreadPool.globalInstance().start(runnable)
sys.exit(app.exec_())

if __name__ == "__main__":
# using_q_thread()
using_move_to_thread()
# using_q_runnable()

May I ask you to upload it as a file to https://uploads.services.jetbrains.com/ and let me know the name of the file so I have it with correct formatting?

I have uploaded the file and it is called "so_thread1.py"

Thank you!

I filed an issue to our tracker https://youtrack.jetbrains.com/issue/PY-37222 so the responsible developer can take a look.
It seems that it can be related to https://youtrack.jetbrains.com/issue/PY-24229, but let's see what the developer says.