import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk
import time
from multiprocessing import Process, Value, Lock, Pool

class Counter(object):
    def __init__(self, initval=0.0):
        self.val = Value('d', initval)
        self.lock = Lock()

    def increment(self):
        with self.lock:
            self.val.value += 1/2542
            print(self.val.value)

    def value(self):
        with self.lock:
            return self.val.value

class MyWindow(Gtk.Window):

    def __init__(self):
        Gtk.Window.__init__(self, title = 'Hello World')

        #self.val = 0

        self.box = Gtk.Box(spacing=6)
        self.add(self.box)

        self.button1 = Gtk.Button(label = 'Hello')
        self.button1.connect('clicked', self.on_button1_clicked)
        self.box.pack_start(self.button1, True, True, 0)

        self.button2 = Gtk.Button(label = 'Goodbye')
        self.button2.connect('clicked', self.on_button2_clicked)
        self.box.pack_start(self.button2, True, True, 0)

        self.pbar = Gtk.ProgressBar()
        self.pbar.set_fraction(0.0)
        self.box.pack_start(self.pbar, True, True, 0)

    def on_button1_clicked(self, widget):
        print('Hello')
        #procs = [Process(target=self.func, args=(counter,)) for i in range(10)]

        #for p in procs: p.start()
        #for p in procs: p.join()
        p = Pool(2)
        p.map(self.func, range(2542))
        print (counter.value())

        #while counter.val.value <10:
            #self.update_pbar(self.pbar)
        print('Goodbye')
        Gtk.main_quit()

    def on_button2_clicked(self, widget):
        print('Goodbye')
        Gtk.main_quit()

    def update_pbar(self, widget, value):
        #self.val += 0.1
        self.pbar.set_fraction(value)
        #time.sleep(0.5)
        while Gtk.events_pending():
            Gtk.main_iteration()
        
    def func(self, data):
        #for i in range(2542):
        time.sleep(0.01)
        counter.increment()
        #while counter.value() <1:
            #self.update_pbar(self.pbar, counter.value())

counter = Counter(0.0)
win = MyWindow()
win.connect('delete-event', Gtk.main_quit)
win.show_all()
Gtk.main()