import threading
import time

class Data_frame():
    lock_var_1 = threading.Lock() # Global lock on the data_frame obj
    var_1 = 0
    var_2 = 0


class Worker_1(threading.Thread):
    def __init__(self, data_frame, time):
        threading.Thread.__init__(self)
        self.daemon = True # Cause CMD window and i like CTRL + C
        self.data = data_frame
        self.time = time

    def run(self):
        while True :
            print("{} : Waiting for DATA lock".format(self.name))
            self.data.lock_var_1.acquire()
            try:
                print("{} : Acquired DATA lock".format(self.name))
                print("{} : Doing some work".format(self.name))
                dummy = self.data.var_1
                time.sleep(self.time) # That's not really but it holds the lock
                self.data.var_1 = dummy + 1
                print("{} : Finished some work = > {}".format(self.name, self.data.var_1))
            finally:
                self.data.lock_var_1.release()
                print("{} : Release DATA lock".format(self.name))



class Worker_2(threading.Thread):
    def __init__(self, data_frame, time):
        threading.Thread.__init__(self)
        self.daemon = True # Cause CMD window and i like CTRL + C
        self.data = data_frame
        self.time = time

    def run(self):
        while True :
            print("{} : Doing some work".format(self.name))
            dummy = self.data.var_2
            time.sleep(self.time) # That's not really but it holds the lock
            self.data.var_2 = dummy + 1
            print("{} : Finished some work      = > {}".format(self.name, self.data.var_2))



class Main_frame():
    def __init__(self):
        self.data = Data_frame()

        self.worker_type_1_n1 = Worker_1(self.data, 2)
        self.worker_type_1_n2 = Worker_1(self.data, 4)
        self.worker_type_2_n1 = Worker_2(self.data, 1)

    def start(self):
        self.worker_type_1_n1.start()
        self.worker_type_1_n2.start()
        self.worker_type_2_n1.start()

def main():
    example = Main_frame()
    example.start()
    time.sleep(30)

if __name__ == "__main__":
    main()