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Title: PyOS_InputHook not called in IDLE subprocess
Type: behavior Stage: resolved
Components: IDLE Versions: Python 3.3
Status: closed Resolution: wont fix
Dependencies: Superseder:
Assigned To: asvetlov Nosy List: BreamoreBoy, asvetlov, gpolo, kbk, mdehoon, roger.serwy
Priority: normal Keywords:

Created on 2004-10-25 12:31 by mdehoon, last changed 2022-04-11 14:56 by admin. This issue is now closed.

Messages (5)
msg22850 - (view) Author: Michiel de Hoon (mdehoon) * Date: 2004-10-25 12:31
PyOS_InputHook is a variable points to a user-defined
function (e.g. in an extension module) that is to be
called periodically when Python is idle (e.g. waiting
for user input). It is used for example by Tkinter to
get messages delivered to the graphics window. For
Python run from the command prompt, PyOS_InputHook (if
not NULL) is called ten times per second.

In IDLE, when a subprocess is being used (so the
default behavior), the main process and the subprocess
each have their own PyOS_InputHook. The problem is that
the subprocess (the one that runs the user's commands)
does not call PyOS_InputHook.

So if a user (in IDLE) imports an extension module that
sets PyOS_InputHook, the extension module will not run
correctly as PyOS_InputHook is being ignored.

The solution to this problem is probably quite simple,
maybe just a line

if (PyOS_InputHook) PyOS_InputHook();

but I am not familiar enough with threads to be able to
figure out what the best location for such a line would
be. I tried putting it inside the loop in
PyEval_EvalFrame in Python/ceval.c, which solved the
problem on some platforms but not on others.

msg109741 - (view) Author: Mark Lawrence (BreamoreBoy) * Date: 2010-07-09 14:07
Wuld anyone with the relevant expertise care to comment on this please?
msg145851 - (view) Author: Roger Serwy (roger.serwy) * (Python committer) Date: 2011-10-18 18:25
This is related to
msg156778 - (view) Author: Andrew Svetlov (asvetlov) * (Python committer) Date: 2012-03-25 21:51
Let's look on IDLE only.
The problem has been fixed by #989712

I will close the issue next week if no objections.
msg157493 - (view) Author: Andrew Svetlov (asvetlov) * (Python committer) Date: 2012-04-04 16:40
Closing as wan't fix.
Date User Action Args
2022-04-11 14:56:07adminsetgithub: 41074
2012-04-04 16:40:33asvetlovsetstatus: open -> closed
messages: + msg157493

assignee: kbk -> asvetlov
resolution: wont fix
stage: test needed -> resolved
2012-03-26 13:27:48asvetlovsetversions: + Python 3.3, - Python 3.1, Python 2.7, Python 3.2
2012-03-25 21:51:21asvetlovsetmessages: + msg156778
2012-03-21 11:58:21asvetlovsetnosy: + asvetlov
2011-10-18 18:25:51roger.serwysetnosy: + roger.serwy
messages: + msg145851
2010-08-19 17:56:33BreamoreBoysetnosy: + gpolo
2010-07-09 14:07:57BreamoreBoysetnosy: + BreamoreBoy
title: PyOS_InputHook not called in subprocess -> PyOS_InputHook not called in IDLE subprocess
messages: + msg109741

versions: + Python 3.1, Python 2.7, Python 3.2, - Python 2.6
2009-02-14 18:19:12ajaksu2setstage: test needed
type: behavior
versions: + Python 2.6, - Python 2.5
2004-10-25 12:31:42mdehooncreate