Multi-threaded apartment model in C# COM objects

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

Sharanga Dayananda - 08 Dec 2003 16:27 GMT

Hi

I have a COM object written in C#, which I'm having trouble with.

It is a database access library which is being called from unmanaged
C++.

Unfortunately, I don't seem to be able to call multiple instances of the
object from within a multi-threaded C++ app.

Only one thread appears to work with the others failing.

I don't seem to be able to find any info. on MTA for C# objects.
However, I seem to remember reading that C# COM objects are by default
MTA.

Thanks in advance.
Sharanga Dayananda

Reply to this Message

Dave Purrington - 08 Dec 2003 18:54 GMT

Have you designed your object to be threadsafe?

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpgenref/html/c
pconthreadingdesignguidelines.asp

Even if you don't have synchronization issues in your own code, it says
this:

"the .NET Framework class libraries are not thread safe by default"

I think the fact that the other threads are "failing" is an indication that
your object is in actuality executing in a MT environment. Otherwise,
they'd queue up to execute serially.

Hope this helps.

D

> Hi
>
[quoted text clipped - 14 lines]
> Thanks in advance.
> Sharanga Dayananda

Reply to this Message

Sharanga Dayananda - 09 Dec 2003 09:11 GMT

> http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpgenref/html/c
pconthreadingdesignguidelines.asp

No, my db lib isn't thread safe.

Thanks.

Sharanga

Reply to this Message

Multi-threaded apartment model in C# COM objects

Free Magazines