Gio Weirdness

fails1.py

import functools
from gi.repository import GObject
from gi.repository import Gio
from gi.repository import GLib


def runloop(func):
    @functools.wraps(func)
    def wrapped(*pargs, **kwargs):
        func(None)

        mc = GLib.main_context_default()
        print(mc)
        ml = GLib.MainLoop.new(mc, True)
        print(ml)

        print("run")
        ml.run()
    return wrapped


@runloop
def main(loop):
    print("main")
    vm = Gio.VolumeMonitor.get()
    for sig in GObject.signal_list_names(Gio.VolumeMonitor):
        print(sig)
        vm.connect(sig, functools.partial(print, sig))


if __name__ == '__main__':
    main()

fails2.py

import functools
from gi.repository import GObject
from gi.repository import Gio
from gi.repository import GLib


def runloop(func):
    @functools.wraps(func)
    def wrapped(*pargs, **kwargs):
        mc = GLib.main_context_default()
        print(mc)
        ml = GLib.MainLoop.new(mc, True)
        print(ml)

        GLib.idle_add(lambda: func(ml, *pargs, **kwargs))
        print("run")
        ml.run()
    return wrapped


@runloop
def main(loop):
    print("main")
    vm = Gio.VolumeMonitor.get()
    for sig in GObject.signal_list_names(Gio.VolumeMonitor):
        print(sig)
        vm.connect(sig, functools.partial(print, sig))


if __name__ == '__main__':
    main()

fails3.py

import functools
from gi.repository import GObject
from gi.repository import Gio
from gi.repository import GLib


def runloop(func):
    @functools.wraps(func)
    def wrapped(*pargs, **kwargs):
        GLib.idle_add(lambda: func(ml, *pargs, **kwargs))
        mc = GLib.main_context_default()
        print(mc)
        ml = GLib.MainLoop.new(mc, True)
        print(ml)

        print("run")
        ml.run()
    return wrapped


@runloop
def main(loop):
    print("main")
    vm = Gio.VolumeMonitor.get()
    for sig in GObject.signal_list_names(Gio.VolumeMonitor):
        print(sig)
        vm.connect(sig, functools.partial(print, sig))


if __name__ == '__main__':
    main()

works.py

import functools
from gi.repository import GObject
from gi.repository import Gio
from gi.repository import GLib


vm = Gio.VolumeMonitor.get()
for sig in GObject.signal_list_names(Gio.VolumeMonitor):
    print(sig)
    vm.connect(sig, functools.partial(print, sig))

mc = GLib.main_context_default()
print(mc)
ml = GLib.MainLoop.new(mc, True)
print(ml)

print("run")
ml.run()