Raspberry Pi kivy dual display code structure example

rpi_kivy_dual_display.py

from multiprocessing import Process, Manager, Event

def display_process(dict_global, is_master, exit_event):
    import os
    if is_master:
        os.environ["KIVY_BCM_DISPMANX_ID"] = "4"
    else:
        os.environ["KIVY_BCM_DISPMANX_ID"] = "5"

    # kivy module imports go here

    # ButtonDIPO, LabelD, and MyApp class definitions
        
    app = MyApp() # create an app and run it
    app.run()

if __name__ == '__main__':
    m = Manager()
    dict_main = m.dict()
    ev = Event()
    dict_main['counter'] = 0
    proc_master = Process(target=display_process, args=(dict_main,True, ev))
    proc_slave = Process(target=display_process, args=(dict_main, False, ev))
    proc_master.start()
    proc_slave.start()
    proc_master.join()
    proc_slave.join()