Thanks a lot, it works now! So far I'm using a really stupid method:
using gobject.timeout_add() to check a global flag variable every 0.1
seconds, if the flag is set, the message dialog will be shown.. But now
they can be fixed:)
On 2013/7/25 23:15, Niklas Koep wrote:
Emitting signals from a thread will run the handler in the same
thread. You shouldn't call gtk functions from a thread other than the
main one. If you insist on doing so you have to make sure to acquire
the GDK lock first by wrapping your code in gtk.gdk.threads_enter()
... gtk.gdk.threads_leave() calls. In this case you also have to call
gtk.gdk.thread_init() as otherwise the main loop will never release
the GDK lock. The easier solution is to push the signal emission to
the main thread by replacing self.emit('ASignal') with
gobject.idle_add(self.emit, 'ASignal') which guarantees the handler
will also run in the main thread (which already has the GDK lock).
Regards.
On Thu, Jul 25, 2013 at 4:56 PM, Todong Ma <gbstac...@gmail.com
<mailto:gbstac...@gmail.com>> wrote:
Hi, everyone
I met a problem that UI will be blocked forever if I emit a signal
from a thread to create a message dialog.
Following code will reproduce the issue, please let me give a
short explanation: AThread thread defines a custom signal named
"ASignal", and the signal handler is aSignal() function of
MainWindow class. The aSignal() function is used to display a
message dialog. Emitting "ASignal" signal will display the message
dialog successfully but the UI is blocked forever.
import gtk
import gobject
import threading
class AThread(threading.Thread, gobject.GObject):
__gsignals__ = {
'ASignal': (gobject.SIGNAL_RUN_LAST,
gobject.TYPE_NONE, ())
}
def __init__(self):
threading.Thread.__init__(self)
gobject.GObject.__init__(self)
def run(self):
self.emit('ASignal')
class MainWindow(gtk.Window):
def aSignal(self, obj):
dialog = gtk.MessageDialog(self,
gtk.DIALOG_DESTROY_WITH_PARENT, gtk.MESSAGE_INFO,
gtk.BUTTONS_CLOSE, 'asdfasf')
dialog.run()
dialog.destroy()
gobject.threads_init()
w = MainWindow()
t = AThread()
t.connect('ASignal', w.aSignal)
t.start()
gtk.main()
Any suggestion is appreciated.
Thanks,
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