Dear users,
I had a problem regarding Threads in python and Gtk3. I want to stop a while
loop in Gtk , a loop starded with a thread.
I want to control a delay timer laser board with give me ,when I send a command
by serial connection, give back continuous status values ; but I want to stop
this loop , to modify parameters and start the loop again.
A part of my code is here :
import serial
import threading
import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk
from gi.repository import GObject,Pango, GLib
from threading import Thread
GObject.threads_init().............
#START BUTTON
def start(self,button_start):
Thread(target=self.start_on,args=(self.button_start))
def start_on(self,widget,data=None):
if ser.isOpen():
cmd = 's'
ser.write(cmd.encode('ascii')+'\r\n')
while True:
try:
values = ser.readline()
self.label_result.set_text(values)
except:
pass
#STOP BUTTON
def stop(self,button_stop):
Thread(target=self.stops,args=(button_stop)).start()
def stops(self,widget,data=None):
if ser.isOpen():
try:
cmd = 'f'
ser.write(cmd.encode('ascii')+'\r\n')
status = ser.readline()
self.label_result.set_text(status)
except:
pass
...........win=sincrolaser()
win.show_all()
Gtk.main()
But the problem is when I send STOP button program freeze , probably the loop
from the start is looping forever. How do I stop the start thread?
Is there a posibility to give a thread flag or identity to find him and close?
Thank you,Alex
---------
Eng.ALEXANDRU ACHIM
National Institute for Lasers, Plasma and Radiation Physics
Center for Advance Laser Technologies - PW Laser Facility
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