Initialise threads for pygtk input hook

IPython/terminal/pt_inputhooks/gtk.py

@@ -1,56 +1,59 b''
 # Code borrowed from python-prompt-toolkit examples
 # https://github.com/jonathanslenders/python-prompt-toolkit/blob/77cdcfbc7f4b4c34a9d2f9a34d422d7152f16209/examples/inputhook.py
 
 # Copyright (c) 2014, Jonathan Slenders
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 """
 PyGTK input hook for prompt_toolkit.
 
 Listens on the pipe prompt_toolkit sets up for a notification that it should
 return control to the terminal event loop.
 """
 from __future__ import absolute_import
 
 import gtk, gobject
 
+# Enable threading in GTK. (Otherwise, GTK will keep the GIL.)
+gtk.gdk.threads_init()
+
 def inputhook(context):
     """
     When the eventloop of prompt-toolkit is idle, call this inputhook.
 
     This will run the GTK main loop until the file descriptor
     `context.fileno()` becomes ready.
 
     :param context: An `InputHookContext` instance.
     """
     def _main_quit(*a, **kw):
         gtk.main_quit()
         return False
 
     gobject.io_add_watch(context.fileno(), gobject.IO_IN, _main_quit)
     gtk.main()