from PyQt5.QtCore import QObject, QThread, QSemaphore, QReadWriteLock, pyqtSignal, pyqtSlot
import random, time
class Share():
    data = dict()
    def __init__(self, key, value):
        Share.data[key] = value
    @staticmethod
    def get(key):
        return Share.data[key]
    @staticmethod
    def set(key, value):
        if isinstance(value, int):
            print("new value:", value)
            Share.data[key] = value
        else:
            raise Exception("Need to be an int")
    @staticmethod
    def multiply(key, value):
           Share.data[key] *= value
class Worker(QThread):
    sma = QSemaphore(QThread.idealThreadCount())
    mutex = QReadWriteLock()
    end = pyqtSignal(Worker)
    count = 0
    def __init__(self, state, data, key):
        super().__init__()
        Worker.count += 1
        self.number = Worker.count
        self.state = state
        self.data = data
        self.key = key
        self.finished.connect(self.__del__)
    def __del__(self):
        self.quit()
        self.deleteLater()
    def run(self):
        self.sma.acquire()
        factor = random.randint(1, 10)
        operation = factor if self.state else 1 / factor
        wait = random.randint(1,10)
        self.mutex.lockForWrite()
        print("thread", self.number, "running | operation =>", operation, \
             "| threads aviable =>", self.sma.available())
        time.sleep(wait)
        self.data.multiply(self.key, operation)
        print("from", self.number, "data = ", self.data.get(self.key))
        self.mutex.unlock()
        self.end.emit(self)
class Test(QObject):
    def __init__(self, origin):
        super().__init__()
        self.w = list()
        for i in range(2,15):
            state = random.randint(0,1)
            new_worker = Worker(state, origin, "a")
            new_worker.end.connect(self.on_end)
            self.w.append(new_worker)
            print("there is", len(self.w), "workers running")
            self.w[i-2].start()
        while len(w) != 0:
            time.sleep(1)
        print("finally, origin is", origin)
    @pyqtSlot(Worker)
    def on_end(self, worker):
        print("bye bye", worker.number)
        del self.w[worker]
origin = Share("a", 1)
ok = Test(origin)