#!/usr/bin/env python

import sys
import random
import time
from PySide2 import QtCore


wait = QtCore.QWaitCondition()
mutex = QtCore.QMutex()


class Producer(QtCore.QThread):
    def run(self):
        while True:
            print("Producer loop hit, waiting for next signal")
            with QtCore.QMutexLocker(mutex):
                # time.sleep(5) # doesn't crash
                wait.wait(mutex) # crashes


class Consumer(QtCore.QThread):
    def run(self):
        while True:
            secs = random.randint(1, 10)
            print(f"Sleep thread sleeping {secs}secs")
            time.sleep(secs)
            wait.wakeOne()


if __name__ == "__main__":
    app = QtCore.QCoreApplication(sys.argv)
    producer = Producer()
    consumer = Consumer()
    producer.start()
    consumer.start()
    #producer.wait() # crashes
    #consumer.wait()