I found the cause. On the surface, my problem appears to be

 

Map<int, Thread*> threadids in Thread_win32.cc not storing Thread*, which results in NULL entry returned, causing crash.

 

For example, first time Thread::initialize() is called from RTRT’s constructor, after threadids is set in the middle of initialize(), threadids naturally has size one.

 

The second time Thread::initialize() is called, prior to setting another thread (could still be the main thread) to threadids, I see threadids has size 0. The previously set entry was gone.

 

Looking deeper, the second invocation of Thread::initialize() was done from my scene_0.dll rather than strictly from manta.exe. That is:

 

Our manta.exe calls ReadMOScene()

Loads scene_0.dll via LoadLibrary()

Fine the function pointer “make_scene” in scene_0.dll and call it

Now in the .dll, this function calls new Group(), which constructs Barrier, which eventually calls Thread::initialize().

 

At this second ::initialize, the threadids has size 0 rather than 1.

 

As I haven’t observed the threadids being changed else where, it almost seems that the code going into the .dll creates a new copy of threadids. And indeed, I created some static integers for testing and similar results are observed.

 

Probably some simple DLL concept I am not aware of?

 

Thanks

 

Bo