How to debug multiple threads?

[PhilipG]

I'm using (not by choice) Microsoft's Visual Studio .NET to do my development. I've written an application that uses Microsoft's recommend method for Async Serial I/O (overlapped).

The problem is, In my main UI thread, I'm doing a bit of serial code (sending, receiving, etc). All is good, until for some reason, my Sending thread seems to hang, crash, or something. I've tried placing all kinds of TRACE() statements to help, but i haven't been able to track it down within the send thread.

I am able to break on when the error occurs from within my main UI thread, but I have no idea how I can switch to the Tx thread to see where it's stuck at.

Is this possible? I would hope so...

Thanks
Phil

[Chris]

I'll use this free debuging tools from Microsoft, this tool is mainly for Device Driver development, but it also can use to debug normal application. Basically, this is a debugging tool you most have 1 in your desktop

[CornedBee]

I never found out how to debug multiple threads. That's the largest problem of multithreaded programming.

[rekcus]

What is your setting for Project Settings->C/C++->Code Generation->Use run-time library?

[PhilipG]

rekcus:

Multi-threaded Debug DLL (/MDd)

Chris: I'll take a look at that...I can't believe Microsoft didn't include a 'switch to thread' ability into VStudio...crazy!

Phil

[parksie]

Stick a breakpoint somewhere in the send thread, and hope

[PhilipG]

parksie, yah, that was my original attempt. Never breaks unless I start sticking breakpoints in legit working code and that is a pain and never allows me to see the bug.

Ugh!

[Zaei]

According to MSDN, you can use the Threads Window (Debug->Threads) to switch between threads for debugging purposes.

Z.

[PhilipG]

Originally posted by Zaei
According to MSDN, you can use the Threads Window (Debug->Threads) to switch between threads for debugging purposes.

Z.

Bingo...perfect!

Thanks
Phil