rtmidi problem after running the code x times

[philipbergwerf]

def midi_input():

    class Collector(threading.Thread):
        def __init__(self, device, port):
            threading.Thread.__init__(self)
            self.setDaemon(True)
            self.port = port
            self.portName = device.getPortName(port)
            self.device = device
            self.quit = False

        def run(self):
            self.device.openPort(self.port)
            self.device.ignoreTypes(True, False, True)
            while True:
                if self.quit:
                    return
                msg = self.device.getMessage(2500)
                if msg:
                    if msg.isNoteOn():
                        if midi_record_toggle == 1:
                            note = msg.getNoteNumber() - 20
                            textw.insert(textw.index(INSERT), number2pitch[note])
                            render('q', papercolor)

    dev = rtmidi.RtMidiIn()
    for i in range(dev.getPortCount()):
        device = rtmidi.RtMidiIn()
        print('OPENING',dev.getPortName(i))
        collector = Collector(device, i)
        collector.start()

    sys.stdin.read(1)
    for c in collectors:
        c.quit = True


threading.Thread(target=midi_input).start()

I am running this using threading. I don't know what the risks are... The code runs fine but if I run it more than 16 times it gives an Error: 'ALSA lib seq_hw.c:466:(snd_seq_hw_open) open /dev/snd/seq failed: Cannot allocate memory. I think it doesn't close the midi port/process but I don't know how to close this correctly. I noticed that Sunvox(a really cool synth) gives the same error on midi input after I messed up with my code. Is there anything suspicious about my code? how am I supposed to use threading; I used this to make a while loop run while other functions are still working. I took the code from a GitHub page and modified it a little. Thanks!

[philipbergwerf]

I found the solution to this problem. I made a variable 'midiswitch' that is standard set to 1 and when the program closes it is set to 0. The while loop checks if the variable is 0 and closes the loop if so.

def midi_input():

    class Collector(threading.Thread):
        def __init__(self, device, port):
            threading.Thread.__init__(self)
            self.setDaemon(True)
            self.port = port
            self.portName = device.getPortName(port)
            self.device = device
            self.quit = False

        def run(self):
            self.device.openPort(self.port)
            self.device.ignoreTypes(True, False, True)
            while True:
                if midiswitch == 0:
                    return
                msg = self.device.getMessage(2500)
                if msg:
                    if msg.isNoteOn():
                        if midi_record_toggle == 1:
                            note = msg.getNoteNumber() - 20
                            if shiftkey == 0:
                                textw.insert(textw.index(INSERT), number2pitch[note])
                            elif shiftkey == 1:
                                textw.insert(textw.index(INSERT), '_'+number2pitch[note])
                            renderkey()

    dev = rtmidi.RtMidiIn()
    for i in range(dev.getPortCount()):
        device = rtmidi.RtMidiIn()
        print('OPENING',dev.getPortName(i))
        collector = Collector(device, i)
        collector.start()

threading.Thread(target=midi_input).start()