import io, sys, multiprocessing

class B(multiprocessing.Process):
    def __init__(self, glock, *args, **kwargs):
        multiprocessing.Process.__init__(self, *args, **kwargs)

        self.glock = glock

    def run(self):
        self.glock.acquire()
        import pdb
        pdb.set_trace()

        print("Hello, World!")

        self.glock.release()
    
class A:
    def __init__(self):
        self.glock = multiprocessing.Lock() 

    def run(self):
        jobs = []
        for k in range(3):
            jobs.append(B(self.glock))

        for j in jobs:
            j.start()

        for j in jobs:
            j.join()

if __name__ == '__main__':
    A().run()