__init__.py 文件源码

def _process_entry_point(channel, iface_name):
    logger.info('Bus monitor process started with PID %r', os.getpid())
    app = QApplication(sys.argv)    # Inheriting args from the parent process

    def exit_if_should():
        if RUNNING_ON_WINDOWS:
            return False
        else:
            return os.getppid() != PARENT_PID       # Parent is dead

    exit_check_timer = QTimer()
    exit_check_timer.setSingleShot(False)
    exit_check_timer.timeout.connect(exit_if_should)
    exit_check_timer.start(2000)

    def get_frame():
        received, obj = channel.receive_nonblocking()
        if received:
            if obj == IPC_COMMAND_STOP:
                logger.info('Bus monitor process has received a stop request, goodbye')
                app.exit(0)
            else:
                return obj

    win = BusMonitorWindow(get_frame, iface_name)
    win.show()

    logger.info('Bus monitor process %r initialized successfully, now starting the event loop', os.getpid())
    sys.exit(app.exec_())


# TODO: Duplicates PlotterManager; refactor into an abstract process factory