[RESOLVED] Can we create threads in Dll?

[retry]

I understand we can call any API's inside a DLL but just curious can we create threads as well? For example we call a function from the dll and that function in turn create some thread (like serial port input thread). Can we do that?

[martho]

I know no reason why this shouldn't be possible.

[kuphryn]

Definitely! A process maps a DLL into its address spaces. Threads created within the DLL are part of the host's process address spaces.

Kuphryn

[kirants]

Yes. Why not ?

[Andreas Masur]

[ Moved thread ]

[littlehead]

how?
I created a DLL in which it creates several threads, but when I use it in an MFC project, it always gets crashed, both in Debug mode and Release mode.
I changed this DLL to a single win32 console project, it runs correctly both in Debug and Release mode.
What's the trick creating multiple threads in dll?

Thanks,
Yuping

[MrViggy]

There is no trick to it. It sounds like there's a bug somewhere in your DLL (or EXE). What crashes and where? Have you looked at it in the debugger?

Viggy

[SPlatten]

Hi, I know this is an old thread. I am working on porting an old win32 DLL to support win64. Part of this update requires replacement of an API, the new API uses threads for background functions. I have tried creating the threads in the DLL and found that despite _beginthreadex returning a valid handle the thread doesn't run. I'm Attaching to the DLL using Visual Studio and I can see the call to _beginthreadex is successful but the thread body never runs.

I've put the same code into a standalone application and it works fine, what could the problem be?

[SPlatten]

Solved....In DllMain there was a call to DisableThreadLibraryCalls(hInstance), which I missed.