[PyQt] Bug Report: QThreadPool doesn't take the ownership of QRunnable

[Riccardo Ferrazzo]

Hi,
In PyQt5 i'm having problems due to deleted objects inside the QThreadPool.
I've created a simple example to prove the existence of the problem:

from PyQt5.QtCore import *
from time import sleep

class Test(QRunnable):
    def __init__(self):
        QRunnable.__init__(self)

    def run(self):
        sleep(10)
        print(self, "Awake!")

    def __del__(self):
        print(self, "Deleted")

def run_thread():
    t = Test()
    QThreadPool.globalInstance().start(t)

if __name__ == "__main__":
    for i in range(10):
        run_thread()
    sleep(20)

It prints out: 
(<__main__.Test object at 0x7feb8499fc30>, 'Deleted')
(<__main__.Test object at 0x7feb8499fc30>, 'Deleted')
(<__main__.Test object at 0x7feb8499fc30>, 'Deleted')
(<__main__.Test object at 0x7feb8499fc30>, 'Deleted')
(<__main__.Test object at 0x7feb8499fc30>, 'Deleted')
(<__main__.Test object at 0x7feb8499fc30>, 'Deleted')
(<__main__.Test object at 0x7feb8499fc30>, 'Deleted')
(<__main__.Test object at 0x7feb8499fc30>, 'Deleted')
(<__main__.Test object at 0x7feb8499fc30>, 'Deleted')
(<__main__.Test object at 0x7feb8499fcc8>, 'Deleted')
(<__main__.Test object at 0x7feb8499fc30>, 'Awake!')
(<__main__.Test object at 0x7feb8499fc30>, 'Deleted')
(<__main__.Test object at 0x7feb8499fcc8>, 'Awake!')
(<__main__.Test object at 0x7feb8499fcc8>, 'Deleted')

-- 
Riccardo Ferrazzo
Software Developer
Develer S.r.l. - http://www.develer.com
Tel.: +39 055 3984627 int. 243