473,382 Members | 1,455 Online
Bytes | Software Development & Data Engineering Community
Post Job

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 473,382 software developers and data experts.

Exception in callback => GPF?


When there's an unhandled exception in my
extension-module's-callback-into-Python-function-object, I get a GPF and
Python exits.
When the exception is being handled within the callback (hence in
Python), I get a very significant hiccup (1 to 5 seconds freeze).

Question: is there a specific way to deal with exceptions when they
happen inside such a callback? I searched the web with no avail. All
callbacks examples I've seen seem not to care about exceptions.

Maybe of importance: the callback is initiated within a native thread.
My C extension module is calling back into Python like this:

/* Python callback function object. */
static PyObject * my_callback = NULL;

/* C callback function passed to the implementation. */
static void external_callback(const MidiData * const data) {

if (my_callback && (my_callback != Py_None)) {

if (! data) {
PyErr_SetString(PyExc_IndexError, getLastErrorMessage());
} else {

PyObject * arglist = NULL;
PyObject * result = NULL;

PyGILState_STATE gil = PyGILState_Ensure();

arglist = Py_BuildValue("(i,i,s#)", data->deviceIndex,
data->timestamp, data->buffer, data->size);// 0, 0, "test", 4);//
result = PyEval_CallObject(my_callback, arglist);





Jul 21 '05 #1
0 1039

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

by: Homa | last post by:
Hi, I have a problem about thread related exception handling. I created a background thread to fill a DataTable in a Windows Application. Inside the code, I have foreach () { try {...
by: Barry Anderberg | last post by:
I am using asynch sockets and so I call BeginReceive and then in my callback function I have certain events that would cause me to want to throw an exception. The problem of course is that the...
by: Bhavya Shah | last post by:
Hello, I am facing a very strange problem in my application. I have a form on which I select a path. I open the FolderBrowserDialog for path selection. Once the path is selected I press a button...
by: David | last post by:
Hi, Ive been trying to work this out for the past 2 days now and im not getting anywhere fast. The problem i have is that i am using Asynchronous sockets to create a Socket Client library....
by: chopsnsauce | last post by:
Here's the example: Dim frm As New FORM1 Try frm.show Catch ex As Exception msgbox ex.message
by: Raymondr | last post by:
Hi, First a brief description of out application: We have a webapplication which calls a couple of webservices during one request (postback). These calls to the webservices are made concurrent...
by: Mark Lewis | last post by:
I have a weird error trapping problem. When running the IDE everything works fine but not when running in an EXE I get the Unhandled Exception Error message box intead of the one in my Try....Catch...
by: koredump | last post by:
Hi all, I have a windows app that makes some asyc calls to my webservice (WSE 3.0 with MTOM). exception gets thrown in the client win app. This exception is being thrown on another thread by a...
by: aine_canby | last post by:
Hi, The problem is that the line - this.Invoke(new MyDelegate(Function), args); // this = MainForm is being called after the line - terminatePopulate = true; therefore I get an exception...
by: CloudSolutions | last post by:
Introduction: For many beginners and individual users, requiring a credit card and email registration may pose a barrier when starting to use cloud servers. However, some cloud server providers now...
by: Faith0G | last post by:
I am starting a new it consulting business and it's been a while since I setup a new website. Is wordpress still the best web based software for hosting a 5 page website? The webpages will be...
by: taylorcarr | last post by:
A Canon printer is a smart device known for being advanced, efficient, and reliable. It is designed for home, office, and hybrid workspace use and can also be used for a variety of purposes. However,...
by: ryjfgjl | last post by:
If we have dozens or hundreds of excel to import into the database, if we use the excel import function provided by database editors such as navicat, it will be extremely tedious and time-consuming...
by: ryjfgjl | last post by:
In our work, we often receive Excel tables with data in the same format. If we want to analyze these data, it can be difficult to analyze them because the data is spread across multiple Excel files...
by: emmanuelkatto | last post by:
Hi All, I am Emmanuel katto from Uganda. I want to ask what challenges you've faced while migrating a website to cloud. Please let me know. Thanks! Emmanuel
by: nemocccc | last post by:
hello, everyone, I want to develop a software for my android phone for daily needs, any suggestions?
by: Sonnysonu | last post by:
This is the data of csv file 1 2 3 1 2 3 1 2 3 1 2 3 2 3 2 3 3 the lengths should be different i have to store the data by column-wise with in the specific length. suppose the i have to...
by: Hystou | last post by:
There are some requirements for setting up RAID: 1. The motherboard and BIOS support RAID configuration. 2. The motherboard has 2 or more available SATA protocol SSD/HDD slots (including MSATA, M.2...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.