python - Terminate the Thread by using button in Tkinter -

in gui code, tried run loop1 , loop2 @ same time clicking 1 button. thus, used thread achieve this. tried stop clicking button , failed. after searching on stackoverflow, found out there no directly way kill thread. here part of code:

def loop1():     while true:         call (["raspivid -n -op 150 -w 640 -h 480 -b 2666666.67 -t 5000 -o test.mp4"],shell=true)         call (["raspivid -n -op 150 -w 640 -h 480 -b 2666666.67 -t 5000 -o test1.mp4"],shell=true)  def loop2():     while true:         call (["arecord -d plughw:1 --duration=5 -f cd -vv rectest.wav"],shell=true)         call (["arecord -d plughw:1 --duration=5 -f cd -vv rectest1.wav"],shell=true)  def combine():     thread(target = loop1).start()     thread(target = loop2).start()  def stop():     thread(target = loop1).terminate()     thread(target = loop2).terminate() 

i tried use these 2 buttons control it.

btn1 = button(tk, text="start recording", width=16, height=5, command=combine) btn1.grid(row=2,column=0) btn2 = button(tk, text="stop recording", width=16, height=5, command=stop) btn2.grid(row=3,column=0) 

i want loop1 , loop2 can stopped button2. apparently there no terminate in thread. used method process. here code:

from subprocess import call multiprocessing import process def loop1():     while true:         call (["raspivid -n -op 150 -w 640 -h 480 -b 2666666.67 -t 5000 -o test.mp4"],shell=true)         call (["raspivid -n -op 150 -w 640 -h 480 -b 2666666.67 -t 5000 -o test1.mp4"],shell=true) def loop2():     while true:         call (["arecord -d plughw:1 --duration=5 -f cd -vv rectest.wav"],shell=true)         call (["arecord -d plughw:1 --duration=5 -f cd -vv rectest1.wav"],shell=true) if __name__ == '__main__':     process(target = loop1).start()     process(target = loop2).start() 

but program finished after ran it. know there terminate function in process. don't know how use it.

a potential solution use events. also, rule of thumb when making guis use objects.

from threading import thread,event subprocess import call  class controller(object):     def __init__(self):         self.thread1 = none         self.thread2 = none         self.stop_threads = event()      def loop1(self):         while not self.stop_threads.is_set():             call (["raspivid -n -op 150 -w 640 -h 480 -b 2666666.67 -t 5000 -o test.mp4"],shell=true)             call (["raspivid -n -op 150 -w 640 -h 480 -b 2666666.67 -t 5000 -o test1.mp4"],shell=true)      def loop2(self):         while not self.stop_threads.is_set():             call (["arecord -d plughw:1 --duration=5 -f cd -vv rectest.wav"],shell=true)             call (["arecord -d plughw:1 --duration=5 -f cd -vv rectest1.wav"],shell=true)      def combine(self):         self.stop_threads.clear()         self.thread1 = thread(target = self.loop1)         self.thread2 = thread(target = self.loop2)         self.thread1.start()         self.thread2.start()      def stop(self):         self.stop_threads.set()         self.thread1.join()         self.thread2.join()         self.thread1 = none         self.thread2 = none 

this way button calls become like:

control = controller() btn1 = button(tk, text="start recording", width=16, height=5, command=control.combine) btn1.grid(row=2,column=0) btn2 = button(tk, text="stop recording", width=16, height=5, command=control.stop) btn2.grid(row=3,column=0)